Reaction: S-adenosyl-L-methionine + dihydroflavodoxin + [formate C-acetyltransferase]-glycine = 5'-deoxyadenosine + L-methionine + flavodoxin semiquinone + [formate C-acetyltransferase]-glycin-2-yl radical
Other name(s): PFL activase; PFL-glycine:S-adenosyl-L-methionine H transferase (flavodoxin-oxidizing, S-adenosyl-L-methionine-cleaving); formate acetyltransferase activating enzyme; formate acetyltransferase-glycine dihydroflavodoxin:S-adenosyl-L-methionine oxidoreductase (S-adenosyl-L-methionine cleaving)
Systematic name: [formate C-acetyltransferase]-glycine dihydroflavodoxin:S-adenosyl-L-methionine oxidoreductase (S-adenosyl-L-methionine cleaving)
Comments: An iron-sulfur protein. A single glycine residue in EC 126.96.36.199, formate C-acetyltransferase, is oxidized to the corresponding radical by transfer of H from its CH2 to AdoMet with concomitant cleavage of the latter. The reaction requires Fe2+. The first stage is reduction of the AdoMet to give methionine and the 5'-deoxyadenosin-5'-yl radical, which then abstracts a hydrogen radical from the glycine residue.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 206367-15-9
1. Frey, M., Rothe, M., Wagner, A.F.V. and Knappe, J. Adenosylmethionine-dependent synthesis of the glycyl radical in pyruvate formate-lyase by abstraction of the glycine C-2 pro-S hydrogen atom. J. Biol. Chem. 269 (1994) 12432-12437. [PMID: 8175649]
2. Wagner, A.F.V., Frey, M., Neugebauer, F.A., Schäfer, W. and Knappe, J. The free radical in pyruvate formate-lyase is located on glycine-734. Proc. Natl. Acad. Sci. USA 89 (1992) 996-1000. [PMID: 1310545]
3. Frey, P.A. Radical mechanisms in enzymatic catalysis. Annu. Rev. Biochem. 70 (2001) 121-148. [PMID: 11395404]