Continued from EC 5.3.3 to EC 5.3.99
EC 5.4.1 Transferring Acyl Groups
EC 5.4.2 Phosphotransferases (Phosphomutases)
EC 5.4.3 Transferring Amino Groups
EC 5.4.4 Transferring Hydroxy Groups
EC 5.4.99 Transferring Other Groups
Accepted name: lysolecithin acylmutase
Reaction: 2-lysolecithin = 3-lysolecithin
Other name(s): lysolecithin migratase
Systematic name: lysolecithin 2,3-acylmutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 9031-24-7
References:
1. Uziel, M. and Hanahan, D.J. An enzyme-catalyzed acyl migration: a lysolecithin migratase. J. Biol. Chem. 226 (1957) 789-798.
Accepted name: precorrin-8X methylmutase
Reaction: precorrin-8X = hydrogenobyrinate
For diagram click here.
Other name(s): precorrin isomerase; hydrogenobyrinic acid-binding protein
Systematic name: precorrin-8X 11,12-methylmutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 138238-71-8
References:
1. Thibaut, D., Couder, M., Famechon, A., Debussche, L., Cameron, B., Crouzet, J., Blanche, F. The final step in the biosynthesis of hydrogenobyrinic acid is catalyzed by the cobH gene product with precorrin-8X as the substrate. J. Bacteriol. 174 (1992) 1043-1049. [PMID: 1732194]
2. Roth, J.R., Lawrence, J.G., Rubenfield, M., Kieffer-Higgins, S., Church, G.M. Characterization of the cobalamin (vitamin B12) biosynthetic genes of Salmonella typhimurium. J. Bacteriol. 175 (1993) 3303-3316. [PMID: 8501034]
3. Roessner, C.A., Warren, M.J., Santander, P.J., Atshaves, B.P., Ozaki, S., Stolowich, N.J., Iida, K., Scott, A.I. Expression of Salmonella typhimurium enzymes for cobinamide synthesis. Identification of the 11-methyl and 20-methyl transferases of corrin biosynthesis. FEBS Lett. 301 (1992) 73-78. [PMID: 1451790]
4. Crouzet, J., Cameron, B., Cauchois, L., Rigault, S., Rouyez, M.C., Blanche, F., Thibaut, D., Debussche, L. Genetic and sequence analysis of an 8.7-kilobase Pseudomonas denitrificans fragment carrying eight genes involved in transformation of precorrin-2 to cobyrinic acid. J. Bacteriol. 172 (1990) 5980-5990. [PMID: 2211521]
Accepted name: phosphoglycerate mutase
Reaction: 2-phospho-D-glycerate = 3-phospho-D-glycerate
Other name(s): phosphoglycerate phosphomutase; phosphoglyceromutase; glycerate phosphomutase (diphosphoglycerate cofactor); monophosphoglycerate mutase; monophosphoglyceromutase; diphosphoglycomutase; diphosphoglycerate mutase; bisphosphoglyceromutase; GriP mutase; MPGM; PGA mutase; PGAM-i; PGAM; PGAM-d; PGM
Systematic name: D-phosphoglycerate 2,3-phosphomutase
Comments: The enzymes from mammals and from yeast are phosphorylated by (2R)-2,3-bis-phosphoglycerate, which is also an intermediate (see introduction to section EC 5.4.2). With the rabbit muscle enzyme, dissociation of bisphosphate from the enzyme is much slower than the overall isomerization. These enzymes also catalyse, slowly, the reactions of EC 5.4.2.4 bisphosphoglycerate mutase; they were formerly listed as EC 2.7.5.3. Enzymes from wheat, rice, insects and some fungi, however, have maximum activity in the absence of 2,3-bisphosphoglycerate, and were formerly listed under the present number as phosphoglycerate phosphomutase.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9032-62-6
References:
1. Grisolia, S. Phosphoglyceric acid mutase. Methods Enzymol. 5 (1962) 236-242.
2. Ray, W.J., Jr. and Peck, E.J., Jr. Phosphomutases, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York , 1972, pp. 407-477.
3. Rose, Z.B. The enzymology of 2,3-bisphosphoglycerate. Adv. Enzymol. Relat. Areas Mol. Biol. 51 (1980) 211-253. [PMID: 6255773]
Accepted name: phosphoglucomutase (α-D-glucose-1,6-bisphosphate-dependent)
Reaction: α-D-glucose 1-phosphate = D-glucose 6-phosphate
For diagram click here.
Other name(s): glucose phosphomutase; phosphoglucose mutase
Systematic name: α-D-glucose 1,6-phosphomutase
Comments: Maximum activity is only obtained in the presence of α-D-glucose 1,6-bisphosphate. This bisphosphate is an intermediate in the reaction, being formed by transfer of a phosphate residue from the enzyme to the substrate, but the dissociation of bisphosphate from the enzyme complex is much slower than the overall isomerization. The enzyme also catalyses (more slowly) the interconversion of 1-phosphate and 6-phosphate isomers of many other α-D-hexoses, and the interconversion of α-D-ribose 1-phosphate and 5-phosphate.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9001-81-4
References:
1. Joshi, J.G. and Handler, P. Phosphoglucomutase. I. Purification and properties of phosphoglucomutase from Escherichia coli. J. Biol. Chem. 239 (1964) 2741-2751. [PMID: 14216423]
2. Najjar, V.A. Phosphoglucomutase, in Boyer, P.D., Lardy, H. and Myrbäck, K. (Eds.), The Enzymes, 2nd edn., vol. 6, Academic Press, New York, 1962, pp. 161-178.
3. Ray, W.J. and Roscelli, G.A. A kinetic study of the phosphoglucomutase pathway. J. Biol. Chem. 239 (1964) 1228-1236.
4. Ray, W.J., Jr. and Peck, E.J., Jr. Phosphomutases, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York , 1972, pp. 407-477.
5. Sutherland, E.W., Cohn, M., Posternak, T. and Cori, C.F. The mechanism of the phosphoglucomutase reaction. J. Biol. Chem. 180 (1949) 1285-1295.
Accepted name: phosphoacetylglucosamine mutase
Reaction: N-acetyl-α-D-glucosamine 1-phosphate = N-acetyl-D-glucosamine 6-phosphate
For diagram click here.
Other name(s): acetylglucosamine phosphomutase; acetylglucosamine phosphomutase; acetylaminodeoxyglucose phosphomutase; phospho-N-acetylglucosamine mutase; N-acetyl-D-glucosamine 1,6-phosphomutase
Systematic name: N-acetyl-α-D-glucosamine 1,6-phosphomutase
Comments: The enzyme is activated by N-acetyl-α-D-glucosamine 1,6-bisphosphate. Formerly EC 2.7.5.2.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9027-51-4
References:
1. Carlson, D.M. Phosphoacetylglucosamine mutase from pig submaxillary gland. Methods Enzymol. 8 (1966) 179-182.
2. Leloir, L.F. and Cardini, C.E. Enzymes acting on glucosamine phosphates. Biochim. Biophys. Acta 20 (1956) 33-42.
3. Ray, W.J., Jr. and Peck, E.J., Jr. Phosphomutases, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York , 1972, pp. 407-477.
4. Reissig, J.L. and Leloir, L.F. Phosphoacetylglucosamine mutase from Neurospora. Methods Enzymol. 8 (1966) 175-178.
Accepted name: bisphosphoglycerate mutase
Reaction: 3-phospho-D-glyceroyl phosphate = 2,3-bisphospho-D-glycerate
Other name(s): diphosphoglycerate mutase; glycerate phosphomutase; bisphosphoglycerate synthase; bisphosphoglyceromutase; biphosphoglycerate synthase; diphosphoglyceric mutase; 2,3-diphosphoglycerate mutase; phosphoglyceromutase; 2,3-diphosphoglycerate synthase; DPGM; 2,3-bisphosphoglycerate mutase; BPGM; diphosphoglyceromutase; 2,3-diphosphoglyceromutase
Systematic name: 3-phospho-D-glycerate 1,2-phosphomutase
Comments: In the direction shown, this enzyme is phosphorylated by 3-phosphoglyceroyl phosphate, to give phosphoenzyme and 3-phosphoglycerate. The latter is rephosphorylated by the enzyme to yield 2,3-bisphosphoglycerate, but this reaction is slowed by dissociation of 3-phosphoglycerate from the enzyme, which is therefore more active in the presence of added 3-phosphoglycerate. This enzyme also catalyses, slowly, the reactions of EC 3.1.3.13 (bisphosphoglycerate phosphatase) and EC 5.4.2.1 (phosphoglycerate mutase). Formerly EC 2.7.5.4.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 37211-69-1
References:
1. Ray, W.J., Jr. and Peck, E.J., Jr. Phosphomutases, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York , 1972, pp. 407-477.
2. Rose, Z.B. The purification and properties of diphosphoglycerate mutase from human erythrocytes. J. Biol. Chem. 243 (1968) 4810-4820. [PMID: 5687724]
3. Rose, Z.B. The enzymology of 2,3-bisphosphoglycerate. Adv. Enzymol. Relat. Areas Mol. Biol. 51 (1980) 211-253. [PMID: 6255773]
Accepted name: phosphoglucomutase (glucose-cofactor)
Reaction: α-D-glucose 1-phosphate = D-glucose 6-phosphate
Other name(s): glucose phosphomutase; glucose-1-phosphate phosphotransferase
Systematic name: α-D-glucose 1,6-phosphomutase (glucose-cofactor)
Comments: The enzyme is activated by D-glucose, which probably acts as an acceptor for a phosphate residue from the substrate, thus being itself converted into the product.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 37278-22-1
References:
1. Fujimoto, A., Ingram, P. and Smith, R.A. D-Glucose-1-phosphate:D-glucose-6-phosphotransferase. Biochim. Biophys. Acta 96 (1965) 91-101. [PMID: 14285271]
2. Ray, W.J., Jr. and Peck, E.J., Jr. Phosphomutases, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York , 1972, pp. 407-477.
Accepted name: β-phosphoglucomutase
Reaction: β-D-glucose 1-phosphate = β-D-glucose 6-phosphate
For diagram of reaction click here.
Systematic name: β-D-glucose 1,6-phosphomutase
Comments: No cofactor requirement has been demonstrated.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 68651-99-0
References:
1. Ben-Zvi, R. and Schramm, M. A phosphoglucomutase specific for β-glucose 1-phosphate. J. Biol. Chem. 236 (1961) 2186-2189.
2. Ray, W.J., Jr. and Peck, E.J., Jr. Phosphomutases, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York , 1972, pp. 407-477.
Accepted name: phosphopentomutase
Reaction: α-D-ribose 1-phosphate = D-ribose 5-phosphate
Other name(s): phosphodeoxyribomutase; deoxyribose phosphomutase; deoxyribomutase; phosphoribomutase; α-D-glucose-1,6-bisphosphate:deoxy-D-ribose-1-phosphate phosphotransferase; D-ribose 1,5-phosphomutase
Systematic name: α-D-ribose 1,5-phosphomutase
Comments: Also converts 2-deoxy-α-D-ribose 1-phosphate into 2-deoxy-D-ribose 5-phosphate. α-D-Ribose 1,5-bisphosphate, 2-deoxy-α-D-ribose 1,5-bisphosphate, or α-D-glucose 1,6-bisphosphate can act as cofactor. Formerly EC 2.7.5.6.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9026-77-1
References:
1. Hammen-Jepersen, K. and Munch-Petersen, A. Phosphodeoxyribomutase from Escherichia coli. Purification and some properties. Eur. J. Biochem. 17 (1970) 397-407. [PMID: 4992818]
2. Kammen, H.O. and Koo, R. Phosphopentomutases. I. Identification of two activities in rabbit tissues. J. Biol. Chem. 244 (1969) 4888-4893. [PMID: 5824563]
3. Ray, W.J., Jr. and Peck, E.J., Jr. Phosphomutases, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York , 1972, pp. 407-477.
Accepted name: phosphomannomutase
Reaction: α-D-mannose 1-phosphate = D-mannose 6-phosphate
For diagram click here.
Other name(s): mannose phosphomutase; phosphomannose mutase; D-mannose 1,6-phosphomutase
Systematic name: α-D-mannose 1,6-phosphomutase
Comments: α-D-Mannose 1,6-bisphosphate or α-D-glucose 1,6-bisphosphate can act as cofactor. Formerly EC 2.7.5.7.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 59536-73-1
References:
1. Small, D.M. and Matheson, N.K. Phosphomannomutase and phosphoglucomutase in developing Cassia corymbosa seeds. Phytochemistry 18 (1979) 1147-1150.
Accepted name: phosphoenolpyruvate mutase
Reaction: phosphoenolpyruvate = 3-phosphonopyruvate
For diagram of reaction click here.
Other name(s): phosphoenolpyruvate-phosphonopyruvate phosphomutase; PEP phosphomutase; phosphoenolpyruvate phosphomutase; PEPPM; PEP phosphomutase
Systematic name: phosphoenolpyruvate 2,3-phosphonomutase
Comments: Involved in the biosynthesis of the C-P bond, although the equilibrium greatly favours phosphoenolpyruvate.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 115756-49-5
References:
1. Bowman, E., McQueney, M., Barry, R.J. and Dunaway-Mariano, D. Catalysis and thermodynamics of the phosphoenolpyruvate phosphonopyruvate rearrangement - entry into the phosphonate class of naturally-occurring organo-phosphorus compounds. J. Am. Chem. Soc. 110 (1988) 5575-5576.
2. Hikada, T., Imai, S., Hara, O., Anzai, H., Murakami, T., Nagaoka, K. and Seto, H. Carboxyphosphonoenolpyruvate phosphonomutase, a novel enzyme catalyzing C-P bond formation. J. Bacteriol. 172 (1990) 3066-3072. [PMID: 2160937]
3. Seidel, H.M., Freeman, S. and Knowles, J.R. Phosphonate biosynthesis: isolation of the enzyme responsible for the formation of a carbon-phosphorus bond. Nature 335 (1988) 457-458. [PMID: 3138545]
Accepted name: phosphoglucosamine mutase
Reaction: α-D-glucosamine 1-phosphate = D-glucosamine 6-phosphate
For diagram click here.
Other Name(s): D-glucosamine 1,6-phosphomutase
Systematic name: α-D-glucosamine 1,6-phosphomutase
Comments: The enzyme is involved in the pathway for bacterial cell-wall peptidoglycan and lipopolysaccharide biosyntheses, being an essential step in the pathway for UDP-N-acetylglucosamine biosynthesis. The enzyme from Escherichia coli is activated by phosphorylation and can be autophosphorylated in vitro by α-D-glucosamine 1,6-bisphosphate, which is an intermediate in the reaction, α-D-glucose 1,6-bisphosphate or ATP. It can also catalyse the interconversion of α-D-glucose 1-phosphate and glucose 6-phosphate, although at a much lower rate.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 9031-92-9
References:
1. Mengin-Lecreulx, D. and van Heijenoort, J. Characterization of the essential gene glmM encoding phosphoglucosamine mutase in Escherichia coli. J. Biol. Chem. 271 (1996) 32-39. [PMID: 8550580]
2. de Reuse, H., Labigne, A. and Mengin-Lecreulx, D. The Helicobacter pylori ureC gene codes for a phosphoglucosamine mutase. J. Bacteriol. 179 (1997) 3488-3493. [PMID: 9171391]
3. Jolly, L., Wu, S., van Heijenoort, J., de Lencastre, H., Mengin-Lecreulx, D. and Tomas, A. The femR315 gene from Staphylococcus aureus, the interruption of which results in reduced methicillin resistance, encodes a phosphoglucosamine mutase. J. Bacteriol. 179 (1997) 5321-5325. [PMID: 9286983]
4. Jolly, L., Ferrari, P., Blanot, D., van Heijenoort, J., Fassy, F. and Mengin-Lecreulx, D. Reaction mechanism of phosphoglucosamine mutase from Escherichia coli. Eur. J. Biochem. 262 (1999) 202-210. [PMID: 10231382]
5. Jolly, L., Pompeo, F., van Heijenoort, J., Fassy, F. and Mengin-Lecreulx, D. Autophosphorylation of phosphoglucosamine mutase from Escherichia coli. J. Bacteriol. 182 (2000) 1280-1285. [PMID: 10671448]
Accepted name: lysine 2,3-aminomutase
Reaction: L-lysine = (3S)-3,6-diaminohexanoate
For reaction pathway click here.
Systematic name: L-lysine 2,3-aminomutase
Comments: Activity is stimulated by S-adenosyl-L-methionine and pyridoxal phosphate.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9075-20-1
References:
1. Aberhart, D.J., Lim, H.-J. and Weiller, B.H. Stereochemistry of lysine 2,3-aminomutase. J. Am. Chem. Soc. 103 (1981) 6750-6752.
2. Zappia, V. and Barker, H.A. Studies on lysine-2,3-aminomutase. Subunit structure and sulfhydryl groups. Biochim. Biophys. Acta 207 (1970) 505-513. [PMID: 5452674]
Accepted name: β-lysine 5,6-aminomutase
Reaction: (3S)-3,6-diaminohexanoate = (3S,5S)-3,5-diaminohexanoate
Other name(s): β-lysine mutase; L-β-lysine 5,6-aminomutase
Systematic name: (3S)-3,6-diaminohexanoate 5,6-aminomutase
Comments: Requires a cobamide coenzyme.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 9075-69-8
References:
1. Retey, J., Kunz, F., Arigoni, D. and Stadtman, T.C. Zur Kenntnis der β-Lysin-Mutase-Reaktion: mechanismus und sterischer Verlauf. Helv. Chim. Acta 61 (1978) 2989-2998.
2. Stadtman, T.C. and Renz, P. Anaerobic degradation of lysine. V. Some properties of the cobamide coenzyme-dependent β-lysine mutase of Clostridium sticklandii. Arch. Biochem. Biophys. 125 (1968) 226-239. [PMID: 5649516]
Accepted name: D-lysine 5,6-aminomutase
Reaction: D-lysine = 2,5-diaminohexanoate
Other name(s): D-α-lysine mutase; adenosylcobalamin-dependent D-lysine 5,6-aminomutase
Systematic name: D-2,6-diaminohexanoate 5,6-aminomutase
Comments: Requires a cobamide coenzyme.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 9075-70-1
References:
1. Morley, C.G.D. and Stadtman, T.C. Studies on the fermentation of D-α-lysine. Purification and properties of an adenosine triphosphate regulated B12-coenzyme-dependent D-α-lysine mutase complex from Clostridium sticklandii. Biochemistry 9 (1970) 4890-4900. [PMID: 5480154]
2. Stadtman, T.C. and Tasi, L. A cobamide coenzyme dependent migration of the ε-amino group of D-lysine. Biochem. Biophys. Res. Commun. 28 (1967) 920-926. [PMID: 4229021]
Accepted name: D-ornithine 4,5-aminomutase
Reaction: D-ornithine = (2R,4S)-2,4-diaminopentanoate
Other name(s): D-α-ornithine 5,4-aminomutase; D-ornithine aminomutase
Systematic name: D-ornithine 4,5-aminomutase
Comments: A pyridoxal-phosphate protein that requires a cobamide coenzyme for activity.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, CAS registry number: 62213-30-3
References:
1. Somack, R. and Costilow, R.N. Purification and properties of a pyridoxal phosphate and coenzyme B12 dependent D-α-ornithine 5,4-aminomutase. Biochemistry 12 (1973) 2597-2604. [PMID: 4711468]
Accepted name: tyrosine 2,3-aminomutase
Reaction: L-tyrosine = 3-amino-3-(4-hydroxyphenyl)propanoate
Other name(s): tyrosine αβ-mutase
Systematic name: L-tyrosine 2,3-aminomutase
Comments: Requires ATP.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 9073-38-5
References:
1. Kurylo-Borowska, Z. and Abramsky, T. Biosynthesis of β-tyrosine. Biochim. Biophys. Acta 264 (1972) 1-10. [PMID: 5021987]
Accepted name: leucine 2,3-aminomutase
Reaction: (2S)-α-leucine = (3R)-β-leucine
Systematic name: (2S)-α-leucine 2,3-aminomutase
Comments: Requires a cobamide coenzyme.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 59125-53-0
References:
1. Freer, I., Pedrocchi-Fantoni, G., Picken, D.J. and Overton, K.H. Stereochemistry of the leucine 2,3-aminomutase from tissue-cultures of Andrographis paniculata. J. Chem. Soc. Chem. Commun. (1981) 80-82.
2. Poston, J.M. Leucine 2,3-aminomutase, an enzyme of leucine catabolism. J. Biol. Chem. 251 (1976) 1859-1863. [PMID: 1270414]
3. Poston, J.M. Coenzyme B12-dependent enzymes in potatoes: leucine 2,3-aminomutase and methylmalonyl-CoA mutase. Phytochemistry 17 (1976) 401-402.
Accepted name: glutamate-1-semialdehyde 2,1-aminomutase
Reaction: L-glutamate 1-semialdehyde = 5-aminolevulinate
For diagram click here and mechanism here.
Glossary: L-glutamate 1-semialdehyde = (S)-4-amino-5-oxopentanoate
Other name(s): glutamate-1-semialdehyde aminotransferase
Systematic name: (S)-4-amino-5-oxopentanoate 4,5-aminomutase
Comments: Requires pyridoxal phosphate.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 68518-07-0
References:
1. Gough, S.P. and Kannangara, C.G. Biosynthesis of Δ-aminolevulinate in greening barley leaves: glutamate 1-semialdehyde aminotransferase. Carlsberg Res. Commun. 43 (1978) 185-194.
Accepted name: glutamate 2,3-aminomutase
Reaction: L-glutamate = 3-aminopentanedioate
Glossary: 3-aminopentanedioate = isoglutamate
Systematic name: L-glutamate 2,3-aminomutase
Comments: This enzyme is a member of the 'AdoMet radical' (radical SAM) family. It contains pyridoxal phosphate and a [4Fe-4S] cluster, which is coordinated by 3 cysteines and binds an exchangeable S-adenosyl-L-methionine molecule. During the reaction cycle, the AdoMet forms a 5'-deoxyadenosyl radical, which is regenerated at the end of the reaction.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Ruzicka, F.J. and Frey, P.A. Glutamate 2,3-aminomutase: a new member of the radical SAM superfamily of enzymes. Biochim. Biophys. Acta 1774 (2007) 286-296. [PMID: 17222594]
Accepted name: phenylalanine aminomutase (L-β-phenylalanine forming)
Reaction: L-phenylalanine = L-β-phenylalanine
Glossary: L-β-phenylalanine = (R)-3-amino-3-phenylpropanoate
Systematic name: L-phenylalanine 2,3-aminomutase [(R)-3-amino-3-phenylpropanoate forming]
Comments: The enzyme contains the cofactor 3,5-dihydro-5-methylidene-4H-imidazol-4-one (MIO). This unique cofactor is formed autocatalytically by cyclization and dehydration of the three amino-acid residues alanine, serine and glycine. cf. EC 5.4.3.11, phenylalanine aminomutase (D-β-phenylalanine forming).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Feng, L., Wanninayake, U., Strom, S., Geiger, J. and Walker, K.D. Mechanistic, mutational, and structural evaluation of a Taxus phenylalanine aminomutase. Biochemistry 50 (2011) 2919-2930. [PMID: 21361343]
EC 5.4.3.11
Accepted name: phenylalanine aminomutase (D-β-phenylalanine forming)
Reaction: L-phenylalanine = D-β-phenylalanine
Glossary: D-β-phenylalanine = (S)-3-amino-3-phenylpropanoate
Other name(s): admH (gene name)
Systematic name: L-phenylalanine 2,3-aminomutase [(S)-3-amino-3-phenylpropanoate]
Comments: The enzyme from the bacterium Pantoea agglomerans produces D-β-phenylalanine, an intermediate in the biosynthesis of the polyketide non-ribosomal antibiotic andrimid. The enzyme contains the cofactor 3,5-dihydro-5-methylidene-4H-imidazol-4-one (MIO), which is formed autocatalytically by cyclization and dehydration of the three amino-acid residues alanine, serine and glycine. cf. EC 5.4.3.10, phenylalanine aminomutase (L-β-phenylalanine forming).
Links to other databases:
BRENDA,
EXPASY,
KEGG,
Metacyc,
CAS registry number:
References:
1. Ratnayake, N.D., Wanninayake, U., Geiger, J.H. and Walker, K.D. Stereochemistry and mechanism of a microbial phenylalanine aminomutase. J. Am. Chem. Soc. 133 (2011) 8531-8533. [PMID: 21561099]
EC 5.4.4 Transferring Hydroxy Groups
Accepted name: (hydroxyamino)benzene mutase
Reaction: (hydroxyamino)benzene = 2-aminophenol
Other name(s): HAB mutase; hydroxylaminobenzene hydroxymutase; hydroxylaminobenzene mutase
Systematic name: (hydroxyamino)benzene hydroxymutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, UM-BBD, CAS registry number: 261765-91-7
References:
1. He, Z., Nadeau, L.J. and Spain, J.C. Characterization of hydroxylaminobenzene mutase from pNBZ139 cloned from Pseudomonas pseudoalcaligenes JS45: a highly-associated sodium-dodecyl-sulfate-stable enzyme catalyzing an intramolecular transfer of hydroxyl group. Eur. J. Biochem. 267 (2000) 1110-1116. [PMID: 10672020]
2. Davis, J.K., Paoli, G.C., He, Z., Nadeau, L.J., Somerville, C.C. and Spain, J.C. Sequence analysis and initial characterization of two isozymes of hydroxylaminobenzene mutase from Pseudomonas pseudoalcaligenes JS45. Appl. Environ. Microbiol. 66 (2000) 2965-2971. [PMID: 10877793]
Accepted name: isochorismate synthase
Reaction: chorismate = isochorismate
For diagram click here.
Other name(s): MenF
Systematic name: isochorismate hydroxymutase
Comments: Requires Mg2+. The reaction is reversible.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 37318-53-9
References:
1. Young, I.G. and Gibson, F. Regulation of the enzymes involved in the biosynthesis of 2,3-dihydroxybenzoic acid in Aerobacter aerogenes and Escherichia coli. Biochim. Biophys. Acta 177 (1969) 401-411. [PMID: 4306838]
2. van Tegelen, L.J., Moreno, P.R., Croes, A.F., Verpoorte, R. and Wullems, G.J. Purification and cDNA cloning of isochorismate synthase from elicited cell cultures of Catharanthus roseus. Plant Physiol. 119 (1999) 705-712. [PMID: 9952467]
3. Dahm, C., Müller, R., Schulte, G., Schmidt, K. and Leistner, E. The role of isochorismate hydroxymutase genes entC and menF in enterobactin and menaquinone biosynthesis in Escherichia coli. Biochim. Biophys. Acta 1425 (1998) 377-386. [PMID: 9795253]
4. Daruwala, R., Kwon, O., Meganathan, R. and Hudspeth, M.E. A new isochorismate synthase specifically involved in menaquinone (vitamin K2) biosynthesis encoded by the menF gene. FEMS Microbiol. Lett. 140 (1996) 159-163. [PMID: 8764478]
Accepted name: 3-(hydroxyamino)phenol mutase
Reaction: 3-hydroxyaminophenol = aminohydroquinone
Other name(s): 3-hydroxylaminophenol mutase; 3HAP mutase
Systematic name: 3-(hydroxyamino)phenol hydroxymutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, UM-BBD, CAS registry number: 224427-05-8
References:
1. Schenzle, A., Lenke, H., Spain, J.C. and Knackmuss, H.J. 3-Hydroxylaminophenol mutase from Ralstonia eutropha JMP134 catalyzes a Bamberger rearrangement. J. Bacteriol. 181 (1999) 1444-1450. [PMID: 10049374]
Accepted name: geraniol isomerase
Reaction: geraniol = (3S)-linalool
For diagram of reaction click here.
Systematic name: geraniol hydroxymutase
Comments: In absence of oxygen the bifunctional linalool dehydratase-isomerase can catalyse in vitro two reactions, the isomerization of (3S)-linalool to geraniol and the hydration of myrcene to (3S)-linalool, the latter activity being classified as EC 4.2.1.127, linalool dehydratase.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Brodkorb, D., Gottschall, M., Marmulla, R., Lüddeke, F. and Harder, J. Linalool dehydratase-isomerase, a bifunctional enzyme in the anaerobic degradation of monoterpenes. J. Biol. Chem. 285 (2010) 30436-30442. [PMID: 20663876]
2. LŸddeke, F. and Harder, J. Enantiospecific (S)-(+)-linalool formation from β-myrcene by linalool dehydratase-isomerase. Z. Naturforsch. C 66 (2011) 409-412. [PMID: 21950166]
Accepted name: 9,12-octadecadienoate 8-hydroperoxide 8R-isomerase
Reaction: (8R,9Z,12Z)-8-hydroperoxyoctadeca-9,12-dienoate = (5S,8R,9Z,12Z)-5,8-dihydroxyoctadeca-9,12-dienoate
Other name(s): 5,8-LDS (bifunctional enzyme); 5,8-linoleate diol synthase (bifunctional enzyme); 8-hydroperoxide isomerase; (8R,9Z,12Z)-8-hydroperoxy-9,12-octadecadienoate mutase ((5S,8R,9Z,12Z)-5,8-dihydroxy-9,12-octadecadienoate-forming); PpoA
Systematic name: (8R,9Z,12Z)-8-hydroperoxyoctadeca-9,12-dienoate hydroxymutase [(5S,8R,9Z,12Z)-5,8-dihydroxyoctadeca-9,12-dienoate-forming]
Comments: The enzyme contains heme [3]. The bifunctional enzyme from Aspergillus nidulans uses different heme domains to catalyse two separate reactions. Linoleic acid is oxidized within the N-terminal heme peroxidase domain to (8R,9Z,12Z)-8-hydroperoxyoctadeca-9,12-dienoate (cf. EC 1.13.11.60, linoleate 8R-lipoxygenase), which is subsequently isomerized to (5S,8R,9Z,12Z)-5,8-dihydroxyoctadeca-9,12-dienoate within the C-terminal P450 heme thiolate domain [3].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Hoffmann, I., Jerneren, F., Garscha, U. and Oliw, E.H. Expression of 5,8-LDS of Aspergillus fumigatus and its dioxygenase domain. A comparison with 7,8-LDS, 10-dioxygenase, and cyclooxygenase. Arch. Biochem. Biophys. 506 (2011) 216-222. [PMID: 21130068]
2. Jerneren, F., Garscha, U., Hoffmann, I., Hamberg, M. and Oliw, E.H. Reaction mechanism of 5,8-linoleate diol synthase, 10R-dioxygenase, and 8,11-hydroperoxide isomerase of Aspergillus clavatus. Biochim. Biophys. Acta 1801 (2010) 503-507. [PMID: 20045744]
3. Brodhun, F., Gobel, C., Hornung, E. and Feussner, I. Identification of PpoA from Aspergillus nidulans as a fusion protein of a fatty acid heme dioxygenase/peroxidase and a cytochrome P450. J. Biol. Chem. 284 (2009) 11792-11805. [PMID: 19286665]
Accepted name: 9,12-octadecadienoate 8-hydroperoxide 8S-isomerase
Reaction: (8R,9Z,12Z)-8-hydroperoxyoctadeca-9,12-dienoate = (7S,8S,9Z,12Z)-7,8-dihydroxyoctadeca-9,12-dienoate
Other name(s): 8-hydroperoxide isomerase (ambiguous); (8R,9Z,12Z)-8-hydroperoxy-9,12-octadecadienoate mutase ((7S,8S,9Z,12Z)-5,8-dihydroxy-9,12-octadecadienoate-forming)
Systematic name: (8R,9Z,12Z)-8-hydroperoxyoctadeca-9,12-dienoate hydroxymutase [(7S,8S,9Z,12Z)-7,8-dihydroxyoctadeca-9,12-dienoate-forming]
Comments: The enzyme contains heme. The bifunctional enzyme from Gaeumannomyces graminis catalyses the oxidation of linoleic acid to (8R,9Z,12Z)-8-hydroperoxyoctadeca-9,12-dienoate (cf. EC 1.13.11.60, linoleate 8R-lipoxygenase), which is then isomerized to (7S,8S,9Z,12Z)-5,8-dihydroxyoctadeca-9,12-dienoate [3].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Hamberg, M., Zhang, L.-Y., Brodowsky, I.D. and Oliw, E.H. Sequential oxygenation of linoleic acid in the fungus Gaeumannomyces graminis: stereochemistry of dioxygenase and hydroperoxide isomerase reactions. Arch. Biochem. Biophys. 309 (1994) 77-80. [PMID: 8117115]
2. Su, C., Sahlin, M. and Oliw, E.H. A protein radical and ferryl intermediates are generated by linoleate diol synthase, a ferric hemeprotein with dioxygenase and hydroperoxide isomerase activities. J. Biol. Chem. 273 (1998) 20744-20751. [PMID: 9694817]
3. Su, C. and Oliw, E.H. Purification and characterization of linoleate 8-dioxygenase from the fungus Gaeumannomyces graminis as a novel hemoprotein. J. Biol. Chem. 271 (1996) 14112-14118. [PMID: 8662736]
![[arrow to right]](../../greek/ARROWR.GIF)
4)-α-D-glucan 1-α-D-glucosylmutaseAccepted name: methylaspartate mutase
Reaction: L-threo-3-methylaspartate = L-glutamate
Other name(s): glutamate mutase; glutamic mutase; glutamic isomerase; glutamic acid mutase; glutamic acid isomerase; methylaspartic acid mutase; β-methylaspartate-glutamate mutase; glutamate isomerase
Systematic name: L-threo-3-methylaspartate carboxy-aminomethylmutase
Comments: Requires a cobamide coenzyme.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9032-97-7
References:
1. Barker, H.A., Rooze, V., Suzuki, F. and Iodice, A.A. The glutamate mutase system. Assays and properties. J. Biol. Chem. 239 (1964) 3260-3266.
2. Weissbach, H., Toohey, J. and Barker, H.A. Isolation and properties of B12 coenzymes containing benzimidazole or dimethylbenzimidazole. Proc. Natl. Acad. Sci. USA 45 (1959) 521-528.
Accepted name: methylmalonyl-CoA mutase
Reaction: (R)-methylmalonyl-CoA = succinyl-CoA
Other name(s): methylmalonyl-CoA CoA-carbonyl mutase; methylmalonyl coenzyme A mutase; methylmalonyl coenzyme A carbonylmutase; (S)-methylmalonyl-CoA mutase; (R)-2-methyl-3-oxopropanoyl-CoA CoA-carbonylmutase [incorrect]
Systematic name: (R)-methylmalonyl-CoA CoA-carbonylmutase
Comments: Requires a cobamide coenzyme.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, UM-BBD, CAS registry number: 9023-90-9
References:
1. Barker, H.A. Coenzyme B12-dependent mutases causing carbon chain rearrangements, in Boyer, P.D. (Ed.), The Enzymes, 3rd edn., vol. 6, Academic Press, New York, 1972, pp. 509-537.
Accepted name: 2-acetolactate mutase
Reaction: 2-acetolactate = 3-hydroxy-3-methyl-2-oxobutanoate
Other name(s): acetolactate mutase; acetohydroxy acid isomerase
Systematic name: 2-acetolactate methylmutase
Comments: Requires ascorbic acid; also converts 2-aceto-2-hydroxybutanoate to 3-hydroxy-3-methyl-2-oxopentanoate.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 37318-52-8
References:
1. Allaudeen, H.S. and Ramakrishnan, T. Biosynthesis of isoleucine and valine in Mycobacterium tuberculosis H37 Rv. Arch. Biochem. Biophys. 125 (1968) 199-209. [PMID: 4384955]
Accepted name: 2-methyleneglutarate mutase
Reaction: 2-methyleneglutarate = 2-methylene-3-methylsuccinate
For diagram click here.
Other name(s): α-methyleneglutarate mutase
Systematic name: 2-methyleneglutarate carboxy-methylenemethylmutase
Comments: Requires a cobamide coenzyme.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, CAS registry number: 9059-10-3
References:
1. Kung, H.-F., Cederbaum, S., Tsai, L. and Stadtman, T.C. Nicotinic acid metabolism. V. A cobamide coenzyme-dependent conversion of α-methyleneglutaric acid to dimethylmaleic acid. Proc. Natl. Acad. Sci. USA 65 (1970) 978-984. [PMID: 5266166]
2. Kung, H.-F. and Stadtman, T.C. Nicotinic acid metabolism. VI. Purification and properties of α-methyleneglutarate mutase (B12-dependent) and methylitaconate isomerase. J. Biol. Chem. 246 (1971) 3378-3388. [PMID: 5574401]
Accepted name: chorismate mutase
Reaction: chorismate = prephenate
For diagram click here and mechanism here.
Other name(s): hydroxyphenylpyruvate synthase
Systematic name: chorismate pyruvatemutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 9068-30-8
References:
1. Cotton, R.G.H. and Gibson, F. The biosynthesis of phenylalanine and tyrosine; enzymes converting chorismic acid into prephenic acid and their relationships to prephenate dehydratase and prephenate dehydrogenase. Biochim. Biophys. Acta 100 (1965) 76-88.
2. Lorence, J.H. and Nester, E.W. Multiple molecular forms of chorismate mutase in Bacillus subtillis. Biochemistry 6 (1967) 1541-1543. [PMID: 4962500]
3. Sprössler, B. and Lingens, F. Chorismat-Mutase aus Claviceps. I. Eigenschaften der Chorismat-Mutase aus verschiedenen Claviceps-Stämmen. Hoppe-Seyler's Z. Physiol. Chem. 351 (1970) 448-458. [PMID: 5443801]
4. Woodin, T.S. and Nishioka, L. Evidence for three isozymes of chorismate mutase in alfalfa. Biochim. Biophys. Acta 309 (1973) 211-223. [PMID: 4708674]
[EC 5.4.99.6 Transferred entry: now EC 5.4.4.2 isochorismate synthase. (EC 5.4.99.6 created 1972, deleted 2003)]
Accepted name: lanosterol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = lanosterol
For reaction pathway click here.
Other name(s): 2,3-epoxysqualene lanosterol cyclase; squalene-2,3-oxide-lanosterol cyclase; lanosterol 2,3-oxidosqualene cyclase; squalene 2,3-epoxide:lanosterol cyclase; 2,3-oxidosqualene sterol cyclase; oxidosqualene cyclase; 2,3-oxidosqualene cyclase; 2,3-oxidosqualene-lanosterol cyclase; oxidosqualene-lanosterol cyclase; squalene epoxidase-cyclase; (S)-2,3-epoxysqualene mutase (cyclizing, lanosterol-forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, lanosterol-forming)
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 9032-71-7
References:
1. Dean, P.D.G., Oritz de Montellano, P.R., Bloch, K. and Corey, E.J. A soluble 2,3-oxidosqualene sterol cyclase. J. Biol. Chem. 242 (1967) 3014-3015. [PMID: 6027261]
Accepted name: cycloartenol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = cycloartenol
For reaction pathway click here.
Other name(s): 2,3-epoxysqualene cycloartenol-cyclase; squalene-2,3-epoxide-cycloartenol cyclase; 2,3-epoxysqualene cycloartenol-cyclase; 2,3-epoxysqualene-cycloartenol cyclase; 2,3-oxidosqualene-cycloartenol cyclase; (S)-2,3-epoxysqualene mutase (cyclizing, cycloartenol-forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, cycloartenol-forming)
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 9075-25-6
References:
1. Rees, H.H., Goad, L.J. and Goodwin, T.W. 2,3-Oxidosqualene cycloartenol cyclase from Ochromonas malhamensis. Biochim. Biophys. Acta 176 (1969) 892-894. [PMID: 5797101]
Accepted name: UDP-galactopyranose mutase
Reaction: UDP-α-D-galactopyranose = UDP-α-D-galactofuranose
For diagram of reaction click here and (mechanism here).
Other name(s): UGM; UDP-D-galactopyranose furanomutase
Systematic name: UDP-α-D-galactopyranose furanomutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 174632-18-9
References:
1. Trejo, A.G., Chittenden, G.J.F., Buchanan, J.G. and Baddiley, J. Uridine diphosphate α-D-galactofuranose, an intermediate in the biosynthesis of galactofuranosyl residues. Biochem. J. 117 (1970) 637-639. [PMID: 5419754]
2. Karunan Partha, S., Bonderoff, S.A., van Straaten, K.E. and Sanders, D.A. Expression, purification and preliminary X-ray crystallographic analysis of UDP-galactopyranose mutase from Deinococcus radiodurans. Acta Crystallogr. Sect. F Struct. Biol. Cryst. Commun. 65 (2009) 843-845. [PMID: 19652355]
3. Dhatwalia, R., Singh, H., Oppenheimer, M., Karr, D.B., Nix, J.C., Sobrado, P. and Tanner, J.J. Crystal structures and small-angle x-ray scattering analysis of UDP-galactopyranose mutase from the pathogenic fungus Aspergillus fumigatus. J. Biol. Chem. 287 (2012) 9041-9051. [PMID: 22294687]
4. van Straaten, K.E., Routier, F.H. and Sanders, D.A. Towards the crystal structure elucidation of eukaryotic UDP-galactopyranose mutase. Acta Crystallogr. Sect. F Struct. Biol. Cryst. Commun. 68 (2012) 455-459. [PMID: 22505419]
[EC 5.4.99.10 Deleted entry: Now included with EC 5.4.99.11 isomaltulose synthase (EC 5.4.99.10 created 1984, deleted 1992)]
Accepted name: isomaltulose synthase
Reaction: sucrose = 6-O-α-D-glucopyranosyl-D-fructofuranose
Other name(s): isomaltulose synthetase; sucrose α-glucosyltransferase; trehalulose synthase
Systematic name: sucrose glucosylmutase
Comments: The enzyme simultaneously produces isomaltulose (6-O-α-D-glucopyranosyl-D-fructose) and smaller amounts of trehalulose (1-O-α-D-glucopyranosyl-β-D-fructose) from sucrose.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 159940-49-5
References:
1. Cheetham, P.S.J. The extraction and mechanism of a novel isomaltulose-synthesizing enzyme from Erwinia rhapontici. Biochem. J. 220 (1984) 213-220. [PMID: 6743261]
2. Cheetham, P.S.J., Imber, C.E. and Isherwood, J. The formation of isomaltulose by immobilized Erwinia rhapontici. Nature 299 (1982) 628-631.
Accepted name: tRNA pseudouridine38-40 synthase
Reaction: tRNA uridine38-40 = tRNA pseudouridine38-40
For diagram of mechanism click here.
Other name(s): TruA; tRNA pseudouridine synthase I; PSUI; hisT (gene name)
Systematic name: tRNA-uridine38-40 uracil mutase
Comments: The uridylate residues at positions 38, 39 and 40 of nearly all tRNAs are isomerized to pseudouridine. TruA specifically modifies uridines at positions 38, 39, and/or 40 in the anticodon stem loop of tRNAs with highly divergent sequences and structures [1].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 61506-89-6
References:
1. Hur, S. and Stroud, R.M. How U38, 39, and 40 of many tRNAs become the targets for pseudouridylation by TruA. Mol. Cell 26 (2007) 189-203. [PMID: 17466622]
2. Huang, L., Pookanjanatavip, M., Gu, X. and Santi, D.V. A conserved aspartate of tRNA pseudouridine synthase is essential for activity and a probable nucleophilic catalyst. Biochemistry 37 (1998) 344-351. [PMID: 9425056]
3. Kammen, H.O., Marvel, C.C., Hardy, L. and Penhoet, E.E. Purification, structure, and properties of Escherichia coli tRNA pseudouridine synthase I. J. Biol. Chem. 263 (1988) 2255-2263. [PMID: 3276686]
4. Turnbough, C.L., Jr., Neill, R.J., Landsberg, R. and Ames, B.N. Pseudouridylation of tRNAs and its role in regulation in Salmonella typhimurium. J. Biol. Chem. 254 (1979) 5111-5119. [PMID: 376505]
5. Zhao, X. and Horne, D.A. The role of cysteine residues in the rearrangement of uridine to pseudouridine catalyzed by pseudouridine synthase I. J. Biol. Chem. 272 (1997) 1950-1955. [PMID: 8999885]
6. Foster, P.G., Huang, L., Santi, D.V. and Stroud, R.M. The structural basis for tRNA recognition and pseudouridine formation by pseudouridine synthase I. Nat. Struct. Biol. 7 (2000) 23-27. [PMID: 10625422]
7. Dong, X., Bessho, Y., Shibata, R., Nishimoto, M., Shirouzu, M., Kuramitsu, S. and Yokoyama, S. Crystal structure of tRNA pseudouridine synthase TruA from Thermus thermophilus HB8. RNA Biol 3 (2006) 115-122. [PMID: 17114947]
8. Arena, F., Ciliberto, G., Ciampi, S. and Cortese, R. Purification of pseudouridylate synthetase I from Salmonella typhimurium. Nucleic Acids Res. 5 (1978) 4523-4536. [PMID: 370771]
Accepted name: isobutyryl-CoA mutase
Reaction: 2-methylpropanoyl-CoA = butanoyl-CoA
Other name(s): isobutyryl coenzyme A mutase; butyryl-CoA:isobutyryl-CoA mutase
Systematic name: 2-methylpropanoyl-CoA CoA-carbonylmutase
Comments: Requires a cobamide coenzyme.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 116405-23-3
References:
1. Brendelberger, G., Rétey, J., Ashworth, D.M., Reynolds, K., Willenbrock, F. and Robinson, J.A. The enzymic interconversion of isobutyryl and N-butyrylcarba(dethia)-coenzyme-A - a coenzyme-B12-dependent carbon skeleton rearrangement. Angew. Chem. Int. Ed. Engl. 27 (1988) 1089-1091.
Accepted name: 4-carboxymethyl-4-methylbutenolide mutase
Reaction: 4-carboxymethyl-4-methylbut-2-en-1,4-olide = 4-carboxymethyl-3-methylbut-2-en-1,4-olide
Other name(s): 4-methyl-2-enelactone isomerase; 4-methylmuconolactone methylisomerase; 4-methyl-3-enelactone methyl isomerase
Systematic name: 4-carboxymethyl-4-methylbut-2-en-1,4-olide methylmutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 115300-03-3
References:
1. Bruce, N.C. and Cain, R.B. β-Methylmuconolactone, a key intermediate in the dissimilation of methylaromatic compounds by a modified 3-oxoadipate pathway evolved in nocardioform actinomycetes. FEMS Microbiol. Lett. 50 (1988) 233-239.
Accepted name: (1→4)-α-D-glucan 1-α-D-glucosylmutase
Reaction: 4-[(1→4)-α-D-glucosyl]n-1-D-glucose = 1-α-D-[(1→4)-α-D-glucosyl]n-1-α-D-glucopyranoside
Other name(s): malto-oligosyltrehalose synthase; maltodextrin α-D-glucosyltransferase
Systematic name: (1→4)-α-D-glucan 1-α-D-glucosylmutase
Comments: The enzyme from Arthrobacter sp., Sulfolobus acidocaldarius acts on (1→4)-α-D-glucans containing three or more (1→4)-α-linked D-glucose units. Not active towards maltose.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 170780-49-1
References:
1. Maruta, K., Nakada, T., Kubota, M., Chaen, H., Sugimoto, T., Kurimoto, M., Tsujisaka, Y. Formation of trehalose from maltooligosaccharides by a novel enzymatic system. Biosci. Biotechnol. Biochem. 59 (1995) 1829-1834. [PMID: 8534970]
2. Nakada, T., Maruta, K., Tsusaki, K., Kubota, M., Chaen, H., Sugimoto, T., Kurimoto, M., Tsujisaka, Y. Purification and properties of a novel enzyme, maltooligosyl trehalose synthase, from Arthrobacter sp. Q36. Biosci. Biotechnol. Biochem. 59 (1995) 2210-2214. [PMID: 8611744]
3. Nakada, T., Ikegami, S., Chaen, H., Kubota, M., Fukuda, S., Sugimoto, T., Kurimoto, M., Tsujisaka, Y. Purification and characterization of thermostable maltooligosyl trehalose synthase from the thermoacidophilic archaebacterium Sulfolobus acidocaldarius. Biosci. Biotechnol. Biochem. 60 (1996) 263-266. [PMID: 9063973]
Accepted name: maltose α-D-glucosyltransferase
Reaction: maltose = α,α-trehalose
Other name(s): trehalose synthase; maltose glucosylmutase
Systematic name: maltose α-D-glucosylmutase
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 395644-91-4
References:
1. Nishimoto, T., Nakano, M., Ikegami, S., Chaen, H., Fukuda, S., Sugimoto, T., Kurimoto, M., Tsujisaka, Y. Existence of a novel enzyme converting maltose to trehalose. Biosci. Biotechnol. Biochem. 59 (1995) 2189-2190.
2. Nishimoto, T., Nakano, M., Nakada, T., Chaen, H., Fukuda, S., Sugimoto, T., Kurimoto, M., Tsujisaka, Y. Purification and properties of a novel enzyme, trehalose synthase, from Pimelobacter sp. R48. Biosci. Biotechnol. Biochem. 60 (1996) 640-644. [PMID: 8829531]
Accepted name: squalene—hopene cyclase
Reaction: squalene = hop-22(29)-ene
For diagram of reaction click here
Systematic name: squalene mutase (cyclizing, hop-22(29)-ene-forming)
Comments: The enzyme also produces the cyclization product hopan-22-ol by addition of water (cf. EC 4.2.1.129, squaleneÑhopanol cyclase). Hopene and hopanol are formed at a constant ratio of 5:1.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 76600-69-6
References:
1. Hoshino, T. and Sato, T. Squalene-hopene cyclase: catalytic mechanism and substrate recognition. Chem. Commun. (2002) 291-301. [PMID: 12120044]
2. Hoshino, T., Nakano, S., Kondo, T., Sato, T. and Miyoshi, A. Squalene-hopene cyclase: final deprotonation reaction, conformational analysis for the cyclization of (3R,S)-2,3-oxidosqualene and further evidence for the requirement of an isopropylidene moiety both for initiation of the polycyclization cascade and for the formation of the 5-membered E-ring. Org Biomol Chem 2 (2004) 1456-1470. [PMID: 15136801]
3. Sato, T., Kouda, M. and Hoshino, T. Site-directed mutagenesis experiments on the putative deprotonation site of squalene-hopene cyclase from Alicyclobacillus acidocaldarius. Biosci. Biotechnol. Biochem. 68 (2004) 728-738. [PMID: 15056909]
4. Reinert, D.J., Balliano, G. and Schulz, G.E. Conversion of squalene to the pentacarbocyclic hopene. Chem. Biol. 11 (2004) 121-126. [PMID: 15113001]
Accepted name: 5-(carboxyamino)imidazole ribonucleotide mutase
Reaction: 5-carboxyamino-1-(5-phospho-D-ribosyl)imidazole = 5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate
For diagram, click here
Other name(s): N5-CAIR mutase; PurE; N5-carboxyaminoimidazole ribonucleotide mutase; class I PurE
Systematic name: 5-carboxyamino-1-(5-phospho-D-ribosyl)imidazole carboxymutase
Comments: In eubacteria, fungi and plants, this enzyme, along with EC 6.3.4.18, 5-(carboxyamino)imidazole ribonucleotide synthase, is required to carry out the single reaction catalysed by EC 4.1.1.21, phosphoribosylaminoimidazole carboxylase, in vertebrates [6]. In the absence of EC 6.3.2.6, phosphoribosylaminoimidazolesuccinocarboxamide synthase, the reaction is reversible [3]. The substrate is readily converted into 5-amino-1-(5-phospho-D-ribosyl)imidazole by non-enzymic decarboxylation [3].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 255379-40-9
References:
1. Meyer, E., Leonard, N.J., Bhat, B., Stubbe, J. and Smith, J.M. Purification and characterization of the purE, purK, and purC gene products: identification of a previously unrecognized energy requirement in the purine biosynthetic pathway. Biochemistry 31 (1992) 5022-5032. [PMID: 1534690]
2. Mueller, E.J., Meyer, E., Rudolph, J., Davisson, V.J. and Stubbe, J. N5-Carboxyaminoimidazole ribonucleotide: evidence for a new intermediate and two new enzymatic activities in the de novo purine biosynthetic pathway of Escherichia coli. Biochemistry 33 (1994) 2269-2278. [PMID: 8117684]
3. Meyer, E., Kappock, T.J., Osuji, C. and Stubbe, J. Evidence for the direct transfer of the carboxylate of N5-carboxyaminoimidazole ribonucleotide (N5-CAIR) to generate 4-carboxy-5-aminoimidazole ribonucleotide catalyzed by Escherichia coli PurE, an N5-CAIR mutase. Biochemistry 38 (1999) 3012-3018. [PMID: 10074353]
4. Mathews, I.I., Kappock, T.J., Stubbe, J. and Ealick, S.E. Crystal structure of Escherichia coli PurE, an unusual mutase in the purine biosynthetic pathway. Structure 7 (1999) 1395-1406. [PMID: 10574791]
5.Ê Firestine, S.M., Poon, S.W., Mueller, E.J., Stubbe, J. and Davisson, V.J. Reactions catalyzed by 5-aminoimidazole ribonucleotide carboxylases from Escherichia coli and Gallus gallus: a case for divergent catalytic mechanisms. Biochemistry 33 (1994) 11927Ð11934. [PMID: 7918411]
6.Ê Firestine, S.M., Misialek, S., Toffaletti, D.L., Klem, T.J., Perfect, J.R. and Davisson, V.J. Biochemical role of the Cryptococcus neoformans ADE2 protein in fungal de novo purine biosynthesis. Arch. Biochem. Biophys. 351 (1998) 123Ð134. [PMID: 9500840]
Accepted name: 16S rRNA pseudouridine516 synthase
Reaction: 16S rRNA uridine516 = 16S rRNA pseudouridine516
For diagram of mechanism click here.
Other name(s): 16S RNA pseudouridine516 synthase; 16S PsiI516 synthase; 16S RNA Ψ516 synthase; RNA pseudouridine synthase RsuA; RsuA; 16S RNA pseudouridine 516 synthase
Systematic name: 16S rRNA-uridine516 uracil mutase
Comments: The enzyme is specific for uridine516 in 16S rRNA. In vitro, the enzyme does not modify free 16S rRNA. The preferred substrate is a 5'-terminal fragment of 16S rRNA complexed with 30S ribosomal proteins [1].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Wrzesinski, J., Bakin, A., Nurse, K., Lane, B.G. and Ofengand, J. Purification, cloning, and properties of the 16S RNA pseudouridine 516 synthase from Escherichia coli. Biochemistry 34 (1995) 8904-8913. [PMID: 7612632]
2. Conrad, J., Niu, L., Rudd, K., Lane, B.G. and Ofengand, J. 16S ribosomal RNA pseudouridine synthase RsuA of Escherichia coli: deletion, mutation of the conserved Asp102 residue, and sequence comparison among all other pseudouridine synthases. RNA 5 (1999) 751-763. [PMID: 10376875]
3. Sivaraman, J., Sauve, V., Larocque, R., Stura, E.A., Schrag, J.D., Cygler, M. and Matte, A. Structure of the 16S rRNA pseudouridine synthase RsuA bound to uracil and UMP. Nat. Struct. Biol. 9 (2002) 353-358. [PMID: 11953756]
Accepted name: 23S rRNA pseudouridine2457 synthase
Reaction: 23S rRNA uridine2457 = 23S rRNA pseudouridine2457
For diagram of mechanism click here.
Other name(s): RluE; YmfC
Systematic name: 23S rRNA-uridine2457 uracil mutase
Comments: The enzyme modifies uridine2457 in a stem of 23S RNA in Escherichia coli.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Del Campo, M., Kaya, Y. and Ofengand, J. Identification and site of action of the remaining four putative pseudouridine synthases in Escherichia coli. RNA 7 (2001) 1603-1615. [PMID: 11720289]
2. Pan, H., Ho, J.D., Stroud, R.M. and Finer-Moore, J. The crystal structure of E. coli rRNA pseudouridine synthase RluE. J. Mol. Biol. 367 (2007) 1459-1470. [PMID: 17320904]
Accepted name: 23S rRNA pseudouridine2604 synthase
Reaction: 23S rRNA uridine2604 = 23S rRNA pseudouridine2604
For diagram of mechanism click here.
Other name(s): RluF; YjbC
Systematic name: 23S rRNA-uridine2604 uracil mutase
Comments: The enzyme is not completely specific for uridine2604 and can, to a small extent, also react with uridine2605 [1].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Del Campo, M., Kaya, Y. and Ofengand, J. Identification and site of action of the remaining four putative pseudouridine synthases in Escherichia coli. RNA 7 (2001) 1603-1615. [PMID: 11720289]
2. Alian, A., DeGiovanni, A., Griner, S.L., Finer-Moore, J.S. and Stroud, R.M. Crystal structure of an RluF-RNA complex: a base-pair rearrangement is the key to selectivity of RluF for U2604 of the ribosome. J. Mol. Biol. 388 (2009) 785-800. [PMID: 19298824]
3. Sunita, S., Zhenxing, H., Swaathi, J., Cygler, M., Matte, A. and Sivaraman, J. Domain organization and crystal structure of the catalytic domain of E. coli RluF, a pseudouridine synthase that acts on 23S rRNA. J. Mol. Biol. 359 (2006) 998-1009. [PMID: 16712869]
Accepted name: 23S rRNA pseudouridine2605 synthase
Reaction: 23S rRNA uridine2605 = 23S rRNA pseudouridine2605
For diagram of mechanism click here.
Other name(s): RluB; YciL
Systematic name: 23S rRNA-uridine2605 uracil mutase
Comments: Pseudouridine synthase RluB converts uridine2605 of 23S rRNA to pseudouridine.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Del Campo, M., Kaya, Y. and Ofengand, J. Identification and site of action of the remaining four putative pseudouridine synthases in Escherichia coli. RNA 7 (2001) 1603-1615. [PMID: 11720289]
2. Jiang, M., Sullivan, S.M., Walker, A.K., Strahler, J.R., Andrews, P.C. and Maddock, J.R. Identification of novel Escherichia coli ribosome-associated proteins using isobaric tags and multidimensional protein identification techniques. J. Bacteriol. 189 (2007) 3434-3444. [PMID: 17337586]
Accepted name: 23S rRNA pseudouridine1911/1915/1917 synthase
Reaction: 23S rRNA uridine1911/uridine1915/uridine1917 = 23S rRNA pseudouridine1911/pseudouridine1915/pseudouridine1917
For diagram of mechanism click here.
Other name(s): RluD; pseudouridine synthase RluD
Systematic name: 23S rRNA-uridine1911/1915/1917 uracil mutase
Comments: Pseudouridine synthase RluD converts uridines at positions 1911, 1915, and 1917 of 23S rRNA to pseudouridines. These nucleotides are located in the functionally important helix-loop 69 of 23S rRNA [1].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Leppik, M., Peil, L., Kipper, K., Liiv, A. and Remme, J. Substrate specificity of the pseudouridine synthase RluD in Escherichia coli. FEBS J. 274 (2007) 5759-5766. [PMID: 17937767]
2. Ejby, M., Sorensen, M.A. and Pedersen, S. Pseudouridylation of helix 69 of 23S rRNA is necessary for an effective translation termination. Proc. Natl. Acad. Sci. USA 104 (2007) 19410-19415. [PMID: 18032607]
3. Sivaraman, J., Iannuzzi, P., Cygler, M. and Matte, A. Crystal structure of the RluD pseudouridine synthase catalytic module, an enzyme that modifies 23S rRNA and is essential for normal cell growth of Escherichia coli. J. Mol. Biol. 335 (2004) 87-101. [PMID: 14659742]
4. Wrzesinski, J., Bakin, A., Ofengand, J. and Lane, B.G. Isolation and properties of Escherichia coli 23S-RNA pseudouridine 1911, 1915, 1917 synthase (RluD). IUBMB Life 50 (2000) 33-37. [PMID: 11087118]
Accepted name: 23S rRNA pseudouridine955/2504/2580 synthase
Reaction: 23S rRNA uridine955/uridine2504/uridine2580 = 23S rRNA pseudouridine955/pseudouridine2504/pseudouridine2580
For diagram of mechanism click here.
Other name(s): RluC; pseudouridine synthase RluC
Systematic name: 23S rRNA-uridine955/2504/2580 uracil mutase
Comments: The enzyme converts uridines at position 955, 2504 and 2580 of 23S rRNA to pseudouridines.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Jiang, M., Sullivan, S.M., Walker, A.K., Strahler, J.R., Andrews, P.C. and Maddock, J.R. Identification of novel Escherichia coli ribosome-associated proteins using isobaric tags and multidimensional protein identification techniques. J. Bacteriol. 189 (2007) 3434-3444. [PMID: 17337586]
2. Conrad, J., Sun, D., Englund, N. and Ofengand, J. The rluC gene of Escherichia coli codes for a pseudouridine synthase that is solely responsible for synthesis of pseudouridine at positions 955, 2504, and 2580 in 23 S ribosomal RNA. J. Biol. Chem. 273 (1998) 18562-18566. [PMID: 9660827]
3. Corollo, D., Blair-Johnson, M., Conrad, J., Fiedler, T., Sun, D., Wang, L., Ofengand, J. and Fenna, R. Crystallization and characterization of a fragment of pseudouridine synthase RluC from Escherichia coli. Acta Crystallogr. D Biol. Crystallogr. 55 (1999) 302-304. [PMID: 10089432]
4. Toh, S.M. and Mankin, A.S. An indigenous posttranscriptional modification in the ribosomal peptidyl transferase center confers resistance to an array of protein synthesis inhibitors. J. Mol. Biol. 380 (2008) 593-597. [PMID: 18554609]
Accepted name: tRNA pseudouridine55 synthase
Reaction: tRNA uridine55 = tRNA pseudouridine55
For diagram of mechanism click here.
Other name(s): TruB; aCbf5; Pus4; YNL292w (gene name); Ψ55 tRNA pseudouridine synthase; tRNA:Ψ55-synthase; tRNA pseudouridine 55 synthase; tRNA:pseudouridine-55 synthase; Ψ55 synthase; tRNA Ψ55 synthase; tRNA:Ψ55 synthase; tRNA-uridine55 uracil mutase; Pus10; tRNA-uridine54/55 uracil mutase
Systematic name: tRNA-uridine55 uracil mutase
Comments: Pseudouridine synthase TruB from Escherichia coli specifically modifies uridine55 in tRNA molecules [1]. The bifunctional archaeal enzyme also catalyses the pseudouridylation of uridine54 [6]. It is not known whether the enzyme from Escherichia coli can also act on position 54 in vitro, since this position is occupied in Escherichia coli tRNAs by thymine.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 430429-15-5
References:
1. Nurse, K., Wrzesinski, J., Bakin, A., Lane, B.G. and Ofengand, J. Purification, cloning, and properties of the tRNA Ψ55 synthase from Escherichia coli. RNA 1 (1995) 102-112. [PMID: 7489483]
2. Becker, H.F., Motorin, Y., Planta, R.J. and Grosjean, H. The yeast gene YNL292w encodes a pseudouridine synthase (Pus4) catalyzing the formation of Ψ55 in both mitochondrial and cytoplasmic tRNAs. Nucleic Acids Res. 25 (1997) 4493-4499. [PMID: 9358157]
3. Pienkowska, J., Wrzesinski, J. and Szweykowska-Kulinska, Z. A cell-free yellow lupin extract containing activities of pseudouridine 35 and 55 synthases. Acta Biochim. Pol. 45 (1998) 745-754. [PMID: 9918501]
4. Chaudhuri, B.N., Chan, S., Perry, L.J. and Yeates, T.O. Crystal structure of the apo forms of Ψ55 tRNA pseudouridine synthase from Mycobacterium tuberculosis: a hinge at the base of the catalytic cleft. J. Biol. Chem. 279 (2004) 24585-24591. [PMID: 15028724]
5. Hoang, C., Hamilton, C.S., Mueller, E.G. and Ferre-D'Amare, A.R. Precursor complex structure of pseudouridine synthase TruB suggests coupling of active site perturbations to an RNA-sequestering peripheral protein domain. Protein Sci. 14 (2005) 2201-2206. [PMID: 15987897]
6. Gurha, P. and Gupta, R. Archaeal Pus10 proteins can produce both pseudouridine 54 and 55 in tRNA. RNA 14 (2008) 2521-2527. [PMID: 18952823]
Accepted name: tRNA pseudouridine65 synthase
Reaction: tRNA uridine65 = tRNA pseudouridine65
For diagram of mechanism click here.
Other name(s): TruC; YqcB
Systematic name: tRNA-uridine65 uracil mutase
Comments: TruC specifically modifies uridines at positions 65 in tRNA.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Del Campo, M., Kaya, Y. and Ofengand, J. Identification and site of action of the remaining four putative pseudouridine synthases in Escherichia coli. RNA 7 (2001) 1603-1615. [PMID: 11720289]
Accepted name: tRNA pseudouridine13 synthase
Reaction: tRNA uridine13 = tRNA pseudouridine13
For diagram of mechanism click here.
Other name(s): TruD; YgbO; tRNA PSI13 synthase; RNA:PSI-synthase Pus7p; Pus7p; RNA:pseudouridine-synthase Pus7p; Pus7 protein
Systematic name: tRNA-uridine13 uracil mutase
Comments: Pseudouridine synthase TruD from Escherichia coli specifically acts on uridine13 in tRNA [2,3]. The Pus7 protein from Saccharomyces cerevisiae is a multisite-multisubstrate pseudouridine synthase that is able to modify uridine13 in several yeast tRNAs, uridine35 in the pre-tRNATyr, uridine35 in U2 small nuclear RNA, and uridine50 in 5S rRNA [5].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Ericsson, U.B., Nordlund, P. and Hallberg, B.M. X-ray structure of tRNA pseudouridine synthase TruD reveals an inserted domain with a novel fold. FEBS Lett. 565 (2004) 59-64. [PMID: 15135053]
2. Chan, C.M. and Huang, R.H. Enzymatic characterization and mutational studies of TruD—the fifth family of pseudouridine synthases. Arch. Biochem. Biophys. 489 (2009) 15-19. [PMID: 19664587]
3. Kaya, Y. and Ofengand, J. A novel unanticipated type of pseudouridine synthase with homologs in bacteria, archaea, and eukarya. RNA 9 (2003) 711-721. [PMID: 12756329]
4. Behm-Ansmant, I., Urban, A., Ma, X., Yu, Y.T., Motorin, Y. and Branlant, C. The Saccharomyces cerevisiae U2 snRNA:pseudouridine-synthase Pus7p is a novel multisite-multisubstrate RNA:Ψ-synthase also acting on tRNAs. RNA 9 (2003) 1371-1382. [PMID: 14561887]
5. Urban, A., Behm-Ansmant, I., Branlant, C. and Motorin, Y. RNA sequence and two-dimensional structure features required for efficient substrate modification by the Saccharomyces cerevisiae RNA:Ψ-synthase Pus7p. J. Biol. Chem. 284 (2009) 5845-5858. [PMID: 19114708]
Accepted name: tRNA pseudouridine32 synthase
Reaction: tRNA uridine32 = tRNA pseudouridine32
For diagram of mechanism click here.
Other name(s): RluA (ambiguous); pseudouridine synthase RluA (ambiguous)
Systematic name: tRNA-uridine32 uracil mutase
Comments: The dual-specificity enzyme also catalyses the formation of pseudouridine746 in 23S rRNA [5]. cf. EC 5.4.99.29 (23S rRNA pseudouridine746 synthase).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Hoang, C., Chen, J., Vizthum, C.A., Kandel, J.M., Hamilton, C.S., Mueller, E.G. and Ferre-D'Amare, A.R. Crystal structure of pseudouridine synthase RluA: indirect sequence readout through protein-induced RNA structure. Mol. Cell 24 (2006) 535-545. [PMID: 17188032]
2. Spedaliere, C.J., Hamilton, C.S. and Mueller, E.G. Functional importance of motif I of pseudouridine synthases: mutagenesis of aligned lysine and proline residues. Biochemistry 39 (2000) 9459-9465. [PMID: 10924141]
3. Raychaudhuri, S., Niu, L., Conrad, J., Lane, B.G. and Ofengand, J. Functional effect of deletion and mutation of the Escherichia coli ribosomal RNA and tRNA pseudouridine synthase RluA. J. Biol. Chem. 274 (1999) 18880-18886. [PMID: 10383384]
4. Ramamurthy, V., Swann, S.L., Spedaliere, C.J. and Mueller, E.G. Role of cysteine residues in pseudouridine synthases of different families. Biochemistry 38 (1999) 13106-13111. [PMID: 10529181]
5. Wrzesinski, J., Nurse, K., Bakin, A., Lane, B.G. and Ofengand, J. A dual-specificity pseudouridine synthase: an Escherichia coli synthase purified and cloned on the basis of its specificity for psi746 in 23S RNA is also specific for Ψ32 in tRNA(phe). RNA 1 (1995) 437-448. [PMID: 7493321]
Accepted name: 23S rRNA pseudouridine746 synthase
Reaction: 23S rRNA uridine746 = 23S rRNA pseudouridine746
For diagram of mechanism click here.
Other name(s): RluA (ambiguous); 23S RNA PSI746 synthase; 23S rRNA pseudouridine synthase; pseudouridine synthase RluA (ambiguous)
Systematic name: 23S rRNA-uridine746 uracil mutase
Comments: RluA is the sole protein responsible for the in vivo formation of 23S RNA pseudouridine746 [2]. The dual-specificity enzyme also catalyses the formation of uridine32 in tRNA [3]. cf. EC 5.4.99.28 (tRNA pseudouridine32 synthase).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Hoang, C., Chen, J., Vizthum, C.A., Kandel, J.M., Hamilton, C.S., Mueller, E.G. and Ferre-D'Amare, A.R. Crystal structure of pseudouridine synthase RluA: indirect sequence readout through protein-induced RNA structure. Mol. Cell 24 (2006) 535-545. [PMID: 17188032]
2. Raychaudhuri, S., Niu, L., Conrad, J., Lane, B.G. and Ofengand, J. Functional effect of deletion and mutation of the Escherichia coli ribosomal RNA and tRNA pseudouridine synthase RluA. J. Biol. Chem. 274 (1999) 18880-18886. [PMID: 10383384]
3. Wrzesinski, J., Nurse, K., Bakin, A., Lane, B.G. and Ofengand, J. A dual-specificity pseudouridine synthase: an Escherichia coli synthase purified and cloned on the basis of its specificity for psi746 in 23S RNA is also specific for Ψ32 in tRNA(phe). RNA 1 (1995) 437-448. [PMID: 7493321]
Accepted name: UDP-arabinopyranose mutase
Reaction: UDP-β-L-arabinofuranose = UDP-β-L-arabinopyranose
Other name(s): Os03g40270 protein; UAM1; UAM3; RGP1; RGP3; OsUAM1; OsUAM2; Os03g0599800 protein; Os07g41360 protein
Systematic name: UDP-arabinopyranose pyranomutase
Comments: The reaction is reversible and at thermodynamic equilibrium the pyranose form is favored over the furanose form (90:10) [1].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Konishi, T., Takeda, T., Miyazaki, Y., Ohnishi-Kameyama, M., Hayashi, T., O'Neill, M.A. and Ishii, T. A plant mutase that interconverts UDP-arabinofuranose and UDP-arabinopyranose. Glycobiology 17 (2007) 345-354. [PMID: 17182701]
2. Konishi, T., Ohnishi-Kameyama, M., Funane, K., Miyazaki, Y., Konishi, T. and Ishii, T. An arginyl residue in rice UDP-arabinopyranose mutase is required for catalytic activity and autoglycosylation. Carbohydr. Res. 345 (2010) 787-791. [PMID: 20149347]
3. Konishi, T., Miyazaki, Y., Yamakawa, S., Iwai, H., Satoh, S. and Ishii, T. Purification and biochemical characterization of recombinant rice UDP-arabinopyranose mutase generated in insect cells. Biosci. Biotechnol. Biochem. 74 (2010) 191-194. [PMID: 20057139]
Accepted name: thalianol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = thalianol
For diagram of reaction click here.
Other name(s): (S)-2,3-epoxysqualene mutase (cyclizing, thalianol-forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, thalianol-forming)
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Fazio, G.C., Xu, R. and Matsuda, S.P.T. Genome mining to identify new plant triterpenoids. J. Am. Chem. Soc. 126 (2004) 5678-5679. [PMID: 15125655]
Accepted name: protostadienol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = (17Z)-protosta-17(20),24-dien-3β-ol
For reaction pathway click here.
Other name(s): PdsA; (S)-2,3-epoxysqualene mutase [cyclizing, (17Z)-protosta-17(20),24-dien-3β-ol-forming]
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase [cyclizing, (17Z)-protosta-17(20),24-dien-3β-ol-forming]
Comments: (17Z)-Protosta-17(20),24-dien-3β-ol is a precursor of the steroidal antibiotic helvolic acid.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Lodeiro, S., Xiong, Q., Wilson, W.K., Ivanova, Y., Smith, M.L., May, G.S. and Matsuda, S.P. Protostadienol biosynthesis and metabolism in the pathogenic fungus Aspergillus fumigatus. Org Lett 11 (2009) 1241-1244. [PMID: 19216560]
Accepted name: cucurbitadienol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = cucurbitadienol
For reaction pathway click here.
Other name(s): CPQ (gene name); (S)-2,3-epoxysqualene mutase (cyclizing, cucurbitadienol-forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, cucurbitadienol-forming)
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Shibuya, M., Adachi, S., and Ebizuka, Y. Cucurbitadienol synthase, the first committed enzyme for cucurbitacin biosynthesis, is a distinct enzyme from cycloartenol synthase for phytosterol biosynthesis. Tetrahedron 60 (2004) 6995-7003.
Accepted name: germanicol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = germanicol
For diagram of reaction click here.
Other name(s): RsM1; (S)-2,3-epoxysqualene mutase (cyclizing, germanicol-forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, germanicol-forming)
Comments: The enzyme produces germanicol, β-amyrin and lupeol in the ratio 63:33:4.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Basyuni, M., Oku, H., Tsujimoto, E., Kinjo, K., Baba, S. and Takara, K. Triterpene synthases from the Okinawan mangrove tribe, Rhizophoraceae. FEBS J. 274 (2007) 5028-5042. [PMID: 17803686]
Accepted name: taraxerol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = taraxerol
For diagram of reaction click here.
Other name(s): RsM2; (S)-2,3-epoxysqualene mutase (cyclizing, taraxerol-forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, taraxerol-forming)
Comments: The enzyme gives taraxerol, β-amyrin and lupeol in the ratio 70:17:13.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Basyuni, M., Oku, H., Tsujimoto, E., Kinjo, K., Baba, S. and Takara, K. Triterpene synthases from the Okinawan mangrove tribe, Rhizophoraceae. FEBS J. 274 (2007) 5028-5042. [PMID: 17803686]
Accepted name: isomultiflorenol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = isomultiflorenol
For diagram of reaction click here.
Other name(s): LcIMS1; (S)-2,3-epoxysqualene mutase (cyclizing, isomultiflorenol-forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, isomultiflorenol-forming)
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Hayashi, H., Huang, P., Inoue, K., Hiraoka, N., Ikeshiro, Y., Yazaki, K., Tanaka, S., Kushiro, T., Shibuya, M. and Ebizuka, Y. Molecular cloning and characterization of isomultiflorenol synthase, a new triterpene synthase from Luffa cylindrica, involved in biosynthesis of bryonolic acid. Eur. J. Biochem. 268 (2001) 6311-6317. [PMID: 11733028]
Accepted name: dammaradiene synthase
Reaction: squalene = dammara-20,24-diene
For diagram of reaction click here.
Systematic name: squalene mutase (cyclizing, dammara-20,24-diene-forming)
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Shinozaki, J., Shibuya, M., Masuda, K. and Ebizuka, Y. Dammaradiene synthase, a squalene cyclase, from Dryopteris crassirhizoma Nakai. Phytochemistry 69 (2008) 2559-2564. [PMID: 18790509]
Accepted name: camelliol C synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = camelliol C
For diagram of reaction click here.
Other name(s): CAMS1; LUP3 (gene name)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, camelliol-C-forming)
Comments: The product is 97% camelliol, 2% achilleol A and 0.2% β-amyrin. Achilleol is an isomer of camelliol C with a 4-methylenecyclohexanol ring system. This enzyme probably evolved from EC 5.4.99.39, β-amyrin synthase.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Kolesnikova, M.D., Wilson, W.K., Lynch, D.A., Obermeyer, A.C. and Matsuda, S.P. Arabidopsis camelliol C synthase evolved from enzymes that make pentacycles. Org. Lett. 9 (2007) 5223-5226. [PMID: 17985917]
Accepted name: β-amyrin synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = β-amyrin
For diagram of reaction click here.
Other name(s): 2,3-oxidosqualene β-amyrin cyclase; AsbAS1; BPY; EtAS; GgbAS1; LjAMY1; MtAMY1; PNY; BgbAS
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, β-amyrin-forming)
Comments: Some organism possess a monofunctional β-amyrin synthase [3,4,6-11], other have a multifunctional enzyme that also catalyses the synthesis of α amyrin (EC 5.4.99.40) [5] or lupeol (EC 5.4.99.41) [6].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Abe, I, Ebizuka, Y., Seo, S. and Sankawa, U. Purification of squalene-2,3-epoxide cyclases from cell suspension cultures of Rabdosia japonica Hara. FEBS Lett. 249 (1989) 100-104.
2. Abe, I., Sankawa, U. and Ebizuka, Y. Purification of 2,3-oxdosqualene:β-amyrin cyclase from pea seedlings. Chem. Pharm. Bull. 37 (1989) 536.
3. Kushiro, T., Shibuya, M. and Ebizuka, Y. β-Amyrin synthase-cloning of oxidosqualene cyclase that catalyzes the formation of the most popular triterpene among higher plants. Eur. J. Biochem. 256 (1998) 238-244. [PMID: 9746369]
4. Hayashi, H., Huang, P., Kirakosyan, A., Inoue, K., Hiraoka, N., Ikeshiro, Y., Kushiro, T., Shibuya, M. and Ebizuka, Y. Cloning and characterization of a cDNA encoding β-amyrin synthase involved in glycyrrhizin and soyasaponin biosyntheses in licorice. Biol. Pharm. Bull. 24 (2001) 912-916. [PMID: 11510484]
5. Husselstein-Muller, T., Schaller, H. and Benveniste, P. Molecular cloning and expression in yeast of 2,3-oxidosqualene-triterpenoid cyclases from Arabidopsis thaliana. Plant Mol. Biol. 45 (2001) 75-92. [PMID: 11247608]
6. Iturbe-Ormaetxe, I., Haralampidis, K., Papadopoulou, K. and Osbourn, A.E. Molecular cloning and characterization of triterpene synthases from Medicago truncatula and Lotus japonicus. Plant Mol. Biol. 51 (2003) 731-743. [PMID: 12683345]
7. Zhang, H., Shibuya, M., Yokota, S. and Ebizuka, Y. Oxidosqualene cyclases from cell suspension cultures of Betula platyphylla var. japonica: molecular evolution of oxidosqualene cyclases in higher plants. Biol. Pharm. Bull. 26 (2003) 642-650. [PMID: 12736505]
8. Hayashi, H., Huang, P., Takada, S., Obinata, M., Inoue, K., Shibuya, M. and Ebizuka, Y. Differential expression of three oxidosqualene cyclase mRNAs in Glycyrrhiza glabra. Biol. Pharm. Bull. 27 (2004) 1086-1092. [PMID: 15256745]
9. Kajikawa, M., Yamato, K.T., Fukuzawa, H., Sakai, Y., Uchida, H. and Ohyama, K. Cloning and characterization of a cDNA encoding β-amyrin synthase from petroleum plant Euphorbia tirucalli L. Phytochemistry 66 (2005) 1759-1766. [PMID: 16005035]
10. Basyuni, M., Oku, H., Tsujimoto, E., Kinjo, K., Baba, S. and Takara, K. Triterpene synthases from the Okinawan mangrove tribe, Rhizophoraceae. FEBS J. 274 (2007) 5028-5042. [PMID: 17803686]
11. Liu, Y., Cai, Y., Zhao, Z., Wang, J., Li, J., Xin, W., Xia, G. and Xiang, F. Cloning and functional analysis of a β-amyrin synthase gene associated with oleanolic acid biosynthesis in Gentiana straminea MAXIM. Biol. Pharm. Bull. 32 (2009) 818-824. [PMID: 19420748]
Accepted name: α-amyrin synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = α-amyrin
For diagram of reaction click here.
Other name(s): 2,3-oxidosqualene α-amyrin cyclase; mixed amyrin synthase
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, α-amyrin-forming)
Comments: A multifunctional enzyme which produces both α- and β-amyrin. (see EC 5.4.99.39, β-amyrin synthase)
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Morita, M., Shibuya, M., Kushiro, T., Masuda, K. and Ebizuka, Y. Molecular cloning and functional expression of triterpene synthases from pea (Pisum sativum) new α-amyrin-producing enzyme is a multifunctional triterpene synthase. Eur. J. Biochem. 267 (2000) 3453-3460. [PMID: 10848960]
Accepted name: lupeol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = lupeol
For diagram of reaction click here.
Other name(s): LUPI; BPW; RcLUS
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, lupeol-forming)
Comments: Also forms some β-amyrin. The recombinant enzyme from Arabidopsis thaliana [3] gives a 1:1 mixture of lupeol and lupan-3β,20-diol with small amounts of β-amyrin, germanicol, taraxasterol and ψ-taraxasterol. See EC 4.2.1.128 (lupan-3β,20-diol synthase).
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Herrera, J.B., Bartel, B., Wilson, W.K. and Matsuda, S.P. Cloning and characterization of the Arabidopsis thaliana lupeol synthase gene. Phytochemistry 49 (1998) 1905-1911. [PMID: 9883589]
2. Shibuya, M., Zhang, H., Endo, A., Shishikura, K., Kushiro, T. and Ebizuka, Y. Two branches of the lupeol synthase gene in the molecular evolution of plant oxidosqualene cyclases. Eur. J. Biochem. 266 (1999) 302-307. [PMID: 10542078]
3. Segura, M.J., Meyer, M.M. and Matsuda, S.P. Arabidopsis thaliana LUP1 converts oxidosqualene to multiple triterpene alcohols and a triterpene diol. Org. Lett. 2 (2000) 2257-2259. [PMID: 10930257]
4. Zhang, H., Shibuya, M., Yokota, S. and Ebizuka, Y. Oxidosqualene cyclases from cell suspension cultures of Betula platyphylla var. japonica: molecular evolution of oxidosqualene cyclases in higher plants. Biol. Pharm. Bull. 26 (2003) 642-650. [PMID: 12736505]
5. Hayashi, H., Huang, P., Takada, S., Obinata, M., Inoue, K., Shibuya, M. and Ebizuka, Y. Differential expression of three oxidosqualene cyclase mRNAs in Glycyrrhiza glabra. Biol. Pharm. Bull. 27 (2004) 1086-1092. [PMID: 15256745]
6. Guhling, O., Hobl, B., Yeats, T. and Jetter, R. Cloning and characterization of a lupeol synthase involved in the synthesis of epicuticular wax crystals on stem and hypocotyl surfaces of Ricinus communis. Arch. Biochem. Biophys. 448 (2006) 60-72. [PMID: 16445885]
7. Basyuni, M., Oku, H., Tsujimoto, E., Kinjo, K., Baba, S. and Takara, K. Triterpene synthases from the Okinawan mangrove tribe, Rhizophoraceae. FEBS J. 274 (2007) 5028-5042. [PMID: 17803686]
Accepted name: tRNA pseudouridine31 synthase
Reaction: tRNA uridine31 = tRNA pseudouridine31
For diagram of mechanism click here.
Other name(s): Pus6p
Systematic name: tRNA-uridine31 uracil mutase
Comments: The enzyme specifically acts on uridine31 in tRNA.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Ansmant, I., Motorin, Y., Massenet, S., Grosjean, H. and Branlant, C. Identification and characterization of the tRNA:Ψ 31-synthase (Pus6p) of Saccharomyces cerevisiae. J. Biol. Chem. 276 (2001) 34934-34940. [PMID: 11406626]
Accepted name: 21S rRNA pseudouridine2819 synthase
Reaction: 21S rRNA uridine2819 = 21S rRNA pseudouridine2819
For diagram of mechanism click here.
Other name(s): Pus5p
Systematic name: 21S rRNA-uridine2819 uracil mutase
Comments: The enzyme specifically acts on uridine2819 in 21S rRNA.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Ansmant, I., Massenet, S., Grosjean, H., Motorin, Y. and Branlant, C. Identification of the Saccharomyces cerevisiae RNA:pseudouridine synthase responsible for formation of psi(2819) in 21S mitochondrial ribosomal RNA. Nucleic Acids Res. 28 (2000) 1941-1946. [PMID: 10756195]
Accepted name: mitochondrial tRNA pseudouridine27/28 synthase
Reaction: mitochondrial tRNA uridine27/28 = mitochondrial tRNA pseudouridine27/28
For diagram of mechanism click here.
Other name(s): Pus2; Pus2p; RNA:pseudouridine synthases 2
Systematic name: mitochondrial tRNA-uridine27/28 uracil mutase
Comments: The mitochondrial enzyme Pus2p is specific for position 27 or 28 in mitochondrial tRNA [1].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Behm-Ansmant, I., Branlant, C. and Motorin, Y. The Saccharomyces cerevisiae Pus2 protein encoded by YGL063w ORF is a mitochondrial tRNA:Ψ27/28-synthase. RNA 13 (2007) 1641-1647. [PMID: 17684231]
Accepted name: tRNA pseudouridine38/39 synthase
Reaction: tRNA uridine38/39 = tRNA pseudouridine38/39
For diagram of mechanism click here.
Other name(s): Deg1; Pus3p; pseudouridine synthase 3
Systematic name: tRNA-uridine38/39 uracil mutase
Comments: The enzyme from Saccharomyces cerevisiae is active only towards uridine38 and uridine39, and shows no activity with uridine40 (cf. EC 5.4.99.12, tRNA pseudouridine38-40 synthase) [1]. In vitro the enzyme from mouse is active on uridine39 and very slightly on uridine38 (human tRNALeu) [2].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Lecointe, F., Simos, G., Sauer, A., Hurt, E.C., Motorin, Y. and Grosjean, H. Characterization of yeast protein Deg1 as pseudouridine synthase (Pus3) catalyzing the formation of Ψ38 and Ψ39 in tRNA anticodon loop. J. Biol. Chem. 273 (1998) 1316-1323. [PMID: 9430663]
2. Chen, J. and Patton, J.R. Pseudouridine synthase 3 from mouse modifies the anticodon loop of tRNA. Biochemistry 39 (2000) 12723-12730. [PMID: 11027153]
Accepted name: shionone synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = shionone
For diagram of reaction click here.
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, shionone-forming)
Comments: The enzyme gives traces of four other triterpenoids
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Sawai, S., Uchiyama, H., Mizuno, S., Aoki, T., Akashi, T., Ayabe, S. and Takahashi, T. Molecular characterization of an oxidosqualene cyclase that yields shionone, a unique tetracyclic triterpene ketone of Aster tataricus. FEBS Lett. 585 (2011) 1031-1036. [PMID: 21377465]
Accepted name: parkeol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = parkeol
For diagram of reaction click here.
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, parkeol-forming)
Comments: The enzyme from rice (Oryza sativa) produces parkeol as a single product [1].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Ito, R., Mori, K., Hashimoto, I., Nakano, C., Sato, T. and Hoshino, T. Triterpene cyclases from Oryza sativa L.: cycloartenol, parkeol and achilleol B synthases. Org. Lett. 13 (2011) 2678-2681. [PMID: 21526825]
Accepted name: achilleol B synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = achilleol B
For diagram of reaction click here.
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, achilleol-B-forming)
Comments: Achilleol B is probably formed by cleavage of the 8-14 and 9-10 bonds of (3S)-2,3-epoxy-2,3-dihydrosqualene as part of the cyclization reaction, after formation of the oleanane skeleton.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Ito, R., Mori, K., Hashimoto, I., Nakano, C., Sato, T. and Hoshino, T. Triterpene cyclases from Oryza sativa L.: cycloartenol, parkeol and achilleol B synthases. Org. Lett. 13 (2011) 2678-2681. [PMID: 21526825]
Accepted name: glutinol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = glutinol
For diagram of reaction click here.
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, glutinol-forming)
Comments: The enzyme from Kalanchoe daigremontiana also gives traces of other triterpenoids.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Wang, Z., Yeats, T., Han, H. and Jetter, R. Cloning and characterization of oxidosqualene cyclases from Kalanchoe daigremontiana: enzymes catalyzing up to 10 rearrangement steps yielding friedelin and other triterpenoids. J. Biol. Chem. 285 (2010) 29703-29712. [PMID: 20610397]
Accepted name: friedelin synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = friedelin
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, friedelin-forming)
For diagram of reaction click here.
Comments: The enzyme from Kalanchoe daigremontiana also gives traces of other triterpenoids.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Wang, Z., Yeats, T., Han, H. and Jetter, R. Cloning and characterization of oxidosqualene cyclases from Kalanchoe daigremontiana: enzymes catalyzing up to 10 rearrangement steps yielding friedelin and other triterpenoids. J. Biol. Chem. 285 (2010) 29703-29712. [PMID: 20610397]
Accepted name: baccharis oxide synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = baccharis oxide
For diagram of reaction click here.
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, baccharis-oxide-forming)
Comments: The enzyme from Stevia rebaudiana also gives traces of other triterpenoids.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Shibuya, M., Sagara, A., Saitoh, A., Kushiro, T. and Ebizuka, Y. Biosynthesis of baccharis oxide, a triterpene with a 3,10-oxide bridge in the A-ring. Org. Lett. 10 (2008) 5071-5074. [PMID: 18850716]
Accepted name: α-seco-amyrin synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = α-seco-amyrin
For diagram of reaction click here.
Glossary: α-seco-amyrin = 8,14-secoursa-7,13-diene-3β-ol
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, α-seco-amyrin-forming)
Comments: The enzyme from Arabidopsis thaliana is multifunctional and produces about equal amounts of α- and β-seco-amyrin. See EC 5.4.99.54, β-seco-amyrin synthase.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Shibuya, M., Xiang, T., Katsube, Y., Otsuka, M., Zhang, H. and Ebizuka, Y. Origin of structural diversity in natural triterpenes: direct synthesis of seco-triterpene skeletons by oxidosqualene cyclase. J. Am. Chem. Soc. 129 (2007) 1450-1455. [PMID: 17263431]
Accepted name: marneral synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = marneral
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, marneral-forming)
For diagram of reaction click here.
Comments: Marneral is a triterpenoid formed by Grob fragmentation of the A ring of 2,3-epoxy-2,3-dihydrosqualene during cyclization.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Xiong, Q., Wilson, W. K. and Matsuda, S. P. T. An Arabidopsis oxidosqualene cyclase catalyzes iridal skeleton formation by Grob fragmentation. Angew. Chem., Int. Ed. 45 (2006) 1285-1288. [PMID: 16425307]
Accepted name: β-seco-amyrin synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = β-seco-amyrin
For diagram of reaction click here.
Glossary: β-seco-amyrin = 8,14-secooleana-7,13-diene-3β-ol
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, β-seco-amyrin-forming)
Comments: The enzyme from Arabidopsis thaliana is multifunctional and produces about equal amounts of α- and β-seco-amyrin. See EC 5.4.99.52, α-seco-amyrin synthase.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Shibuya, M., Xiang, T., Katsube, Y., Otsuka, M., Zhang, H. and Ebizuka, Y. Origin of structural diversity in natural triterpenes: direct synthesis of seco-triterpene skeletons by oxidosqualene cyclase. J. Am. Chem. Soc. 129 (2007) 1450-1455. [PMID: 17263431]
Accepted name: δ-amyrin synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = δ-amyrin
For diagram of reaction click here.
Other name(s): SlTTS2 (gene name)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, δ-amyrin-forming)
Comments: The enzyme from tomato (Solanum lycopersicum) gives 48% δ-amyrin, 18% α-amyrin, 13% β-amyrin and traces of three or four other triterpenoid alcohols [1]. See also EC 5.4.99.40, α-amyrin synthase and EC 5.4.99.39, β-amyrin synthase.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Wang, Z., Guhling, O., Yao, R., Li, F., Yeats, T.H., Rose, J.K. and Jetter, R. Two oxidosqualene cyclases responsible for biosynthesis of tomato fruit cuticular triterpenoids. Plant Physiol. 155 (2011) 540-552. [PMID: 21059824]
Accepted name: tirucalladienol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = tirucalla-7,24-dien-3β-ol
For diagram of reaction click here.
Other name(s): PEN3
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, tirucalla-7,24-dien-3β-ol-forming)
Comments: The product from Arabidopsis thaliana is 85% tirucalla-7,24-dien-3β-ol with trace amounts of other triterpenoids.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Morlacchi, P., Wilson, W.K., Xiong, Q., Bhaduri, A., Sttivend, D., Kolesnikova, M.D. and Matsuda, S.P. Product profile of PEN3: the last unexamined oxidosqualene cyclase in Arabidopsis thaliana. Org. Lett. 11 (2009) 2627-2630. [PMID: 19445469]
Accepted name: baruol synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = baruol
For diagram of reaction click here.
Other name(s): BARS1
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, baruol-forming)
Comments: The enzyme from Arabidopsis thaliana also produces traces of 22 other triterpenoids.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Lodeiro, S., Xiong, Q., Wilson, W.K., Kolesnikova, M.D., Onak, C.S. and Matsuda, S.P. An oxidosqualene cyclase makes numerous products by diverse mechanisms: a challenge to prevailing concepts of triterpene biosynthesis. J. Am. Chem. Soc. 129 (2007) 11213-11222. [PMID: 17705488]
EC 5.4.99.58
Accepted name: methylornithine synthase
Reaction: L-lysine = (3R)-3-methyl-D-ornithine
Glossary: (3R)-3-methyl-D-ornithine = (2R,3R)-2,5-diamino-3-methylpentanoate
Other name(s): PylB
Systematic name: L-lysine carboxy-aminomethylmutase
Comments: The enzyme is a member of the superfamily of S-adenosyl-L-methionine-dependent radical (radical AdoMet) enzymes. Binds a [4Fe-4S] cluster that is coordinated by 3 cysteines and an exchangeable S-adenosyl-L-methionine molecule. The reaction is part of the biosynthesis pathway of pyrrolysine, a naturally occurring amino acid found in some archaeal methyltransferases.
Links to other databases:
BRENDA,
EXPASY,
KEGG,
Metacyc,
CAS registry number:
References:
1. Gaston, M.A., Zhang, L., Green-Church, K.B. and Krzycki, J.A. The complete biosynthesis of the genetically encoded amino acid pyrrolysine from lysine. Nature 471 (2011) 647-650. [PMID: 21455182]
2. Quitterer, F., List, A., Eisenreich, W., Bacher, A. and Groll, M. Crystal structure of methylornithine synthase (PylB): insights into the pyrrolysine biosynthesis. Angew. Chem. Int. Ed. Engl. 51 (2012) 1339-1342. [PMID: 22095926]
Continued with EC 5.5 to EC 5.99
Return to EC 5 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page