IUBMB Enzyme Nomenclature


Accepted name: CMP-N-acetylneuraminate monooxygenase

Reaction: CMP-N-acetylneuraminate + 2 ferrocytochrome b5 + O2 + 2 H+ = CMP-N-glycoloylneuraminate + 2 ferricytochrome b5 + H2O

Other name(s): CMP-N-acetylneuraminic acid hydroxylase; CMP-Neu5Ac hydroxylase; cytidine monophosphoacetylneuraminate monooxygenase; N-acetylneuraminic monooxygenase; cytidine-5'-monophosphate-N-acetylneuraminic acid hydroxylase

Systematic name: CMP-N-acetylneuraminate,ferrocytochrome-b5:oxygen oxidoreductase (N-acetyl-hydroxylating)

Comments: This enzyme contains both a Rieske-type [2Fe-2S] cluster and a second iron site. The ferricytochrome b5 produced is reduced by NADH and cytochrome-b5 reductase (EC The enzyme can be activated by Fe2+ or Fe3+.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 116036-67-0


1. Shaw, L. and Schauer, R. The biosynthesis of N-glycoloylneuraminic acid occurs by hydroxylation of the CMP-glycoside of N-acetylneuraminic acid. Biol. Chem. Hoppe-Seyler 369 (1988) 477-486. [PMID: 3202954]

2. Kozutsumi, Y., Kawano, T., Yamakawa, T. and Suzuki, A. Participation of cytochrome b5 in CMP-N-acetylneuraminic acid hydroxylation in mouse liver cytosol. J. Biochem. (Tokyo) 109 (1990) 704-706.[PMID: 1964451]

3. Schneckenburger, P., Shaw, L. and Schauer, R. Purification, characterization and reconstitution of CMP-N-acetylneuraminate hydroxylase from mouse liver. Glycoconj. J. 11 (1994) 194-203. [PMID: 7841794]

4. Kawano, T., Koyama, S., Takematsu, H., Kozutsumi, Y., Kawasaki, H., Kawashima, S., Kawasaki, T. and Suzuki, A. Molecular cloning of cytidine monophospho-N-acetylneuraminic acid hydroxylase. Regulation of species- and tissue-specific expression of N-glycolylneuraminic acid. J. Biol. Chem. 270 (1995) 16458-16463. [PMID: 7608218]

5. Schlenzka, W., Shaw, L., Kelm, S., Schmidt, C.L., Bill, E., Trautwein, A.X., Lottspeich, F. and Schauer, R. CMP-N-acetylneuraminic acid hydroxylase: the first cytosolic Rieske iron-sulphur protein to be described in Eukarya. FEBS Lett. 385 (1996) 197-200. [PMID: 8647250]

[EC created 1992 as EC, transferred 2003 to EC]

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