Reaction: L-methionine + thioredoxin disulfide + H2O = L-methionine (S)-S-oxide + thioredoxin
For diagram click here and mechanism click here.
Other name(s): fSMsr; methyl sulfoxide reductase I and II; acetylmethionine sulfoxide reductase; methionine sulfoxide reductase; L-methionine:oxidized-thioredoxin S-oxidoreductase; methionine-S-oxide reductase; free-methionine (S)-S-oxide reductase
Systematic name: L-methionine:thioredoxin-disulfide S-oxidoreductase
Comments: Requires NADPH [2]. The reaction occurs in the opposite direction to that given above. Dithiothreitol can replace reduced thioredoxin. L-Methionine (R)-S-oxide is not a substrate [see EC 1.8.4.14, L-methionine (R)-S-oxide reductase].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Black, S., Harte, E.M., Hudson, B. and Wartofsky, L. A specific enzymatic reduction of L-(–)methionine sulfoxide and a related nonspecific reduction of diulfides. J. Biol. Chem. 235 (1960) 2910-2916.
2. Ejiri, S.-I., Weissbach, H. and Brot, N. Reduction of methionine sulfoxide to methionine by Escherichia coli. J. Bacteriol. 139 (1979) 161-164. [PMID: 37234]
3. Ejiri, S.-I., Weissbach, H. and Brot, N. The purification of methionine sulfoxide reductase from Escherichia coli. Anal. Biochem. 102 (1980) 393-398. [PMID: 6999943]
4. Weissbach, H., Resnick, L. and Brot, N. Methionine sulfoxide reductases: history and cellular role in protecting against oxidative damage. Biochim. Biophys. Acta 1703 (2005) 203-212. [PMID: 15680228]