EC - Peptide-methionine (S)-S-oxide reductase

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IntEnz Enzyme Nomenclature


Accepted name:
peptide-methionine (S)-S-oxide reductase
Other names:
methionine sulfoxide reductase [ambiguous]
methionine sulphoxide reductase A
methionine S-oxide reductase [ambiguous]
methionine S-oxide reductase (S-form oxidizing)
methionine sulfoxide reductase A
peptide Met(O) reductase
peptide methionine sulfoxide reductase
Systematic name:
peptide-L-methionine:thioredoxin-disulfide S-oxidoreductase [L-methionine (S)-S-oxide-forming]



The reaction occurs in the reverse direction to that shown above. The enzyme exhibits high specificity for the reduction of the S-form of L-methionine S-oxide, acting faster on the residue in a peptide than on the free amino acid [9]. On the free amino acid, it can also reduce D-methionine (S)-S-oxide but more slowly [9]. The enzyme plays a role in preventing oxidative-stress damage caused by reactive oxygen species by reducing the oxidized form of methionine back to methionine and thereby reactivating peptides that had been damaged. In some species, e.g. Neisseria meningitidis, both this enzyme and EC, methionine (R)-S-oxide reductase, are found within the same protein whereas, in other species, they are separate proteins [1,4]. The reaction proceeds via a sulfenic-acid intermediate [5,10].

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , DIAGRAM , DIAGRAM , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB
Gene Ontology: GO:0008113
UniProtKB/Swiss-Prot: (327) [show] [UniProt]


  1. Moskovitz, J., Singh, V.K., Requena, J., Wilkinson, B.J., Jayaswal, R.K. and Stadtman, E.R.
    Purification and characterization of methionine sulfoxide reductases from mouse and Staphylococcus aureus and their substrate stereospecificity.
    Biochem. Biophys. Res. Commun. 290: 62-65 (2002). [PMID: 11779133]
  2. Taylor, A.B., Benglis, D.M. Jr., Dhandayuthapani, S. and Hart, P.J.
    Structure of Mycobacterium tuberculosis methionine sulfoxide reductase A in complex with protein-bound methionine.
    J. Bacteriol. 185: 4119-4126 (2003). [PMID: 12837786]
  3. Singh, V.K. and Moskovitz, J.
    Multiple methionine sulfoxide reductase genes in Staphylococcus aureus: expression of activity and roles in tolerance of oxidative stress.
    Microbiology 149: 2739-2747 (2003). [PMID: 14523107]
  4. Boschi-Muller, S., Olry, A., Antoine, M. and Branlant, G.
    The enzymology and biochemistry of methionine sulfoxide reductases.
    Biochim. Biophys. Acta 1703: 231-238 (2005). [PMID: 15680231]
  5. Ezraty, B., Aussel, L. and Barras, F.
    Methionine sulfoxide reductases in prokaryotes.
    Biochim. Biophys. Acta 1703: 221-229 (2005). [PMID: 15680230]
  6. Weissbach, H., Resnick, L. and Brot, N.
    Methionine sulfoxide reductases: history and cellular role in protecting against oxidative damage.
    Biochim. Biophys. Acta 1703: 203-212 (2005). [PMID: 15680228]
  7. Kauffmann, B., Aubry, A. and Favier, F.
    The three-dimensional structures of peptide methionine sulfoxide reductases: current knowledge and open questions.
    Biochim. Biophys. Acta 1703: 249-260 (2005). [PMID: 15680233]
  8. Vougier, S., Mary, J. and Friguet, B.
    Subcellular localization of methionine sulphoxide reductase A (MsrA): evidence for mitochondrial and cytosolic isoforms in rat liver cells.
    Biochem. J. 373: 531-537 (2003). [PMID: 12693988]
  9. Olry, A., Boschi-Muller, S., Marraud, M., Sanglier-Cianferani, S., Van Dorsselear, A. and Branlant, G.
    Characterization of the methionine sulfoxide reductase activities of PILB, a probable virulence factor from Neisseria meningitidis.
    J. Biol. Chem. 277: 12016-12022 (2002). [PMID: 11812798]
  10. Brot, N., Weissbach, L., Werth, J. and Weissbach, H.
    Enzymatic reduction of protein-bound methionine sulfoxide.
    Proc. Natl. Acad. Sci. USA 78: 2155-2158 (1981). [PMID: 7017726]

[EC created 2006]