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In enzymology, a peptide-methionine (R)-S-oxide reductase (EC 1.8.4.12) is an enzyme that catalyzes the chemical reaction

peptide-L-methionine + thioredoxin disulfide + H₂O ${\displaystyle \rightleftharpoons }$ peptide-L-methionine (R)-S-oxide + thioredoxin

The 3 substrates of this enzyme are peptide-L-methionine, thioredoxin disulfide, and H₂O, whereas its two products are peptide-L-methionine (R)-S-oxide and thioredoxin.

This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with a disulfide as acceptor. The systematic name of this enzyme class is peptide-methionine:thioredoxin-disulfide S-oxidoreductase . Other names in common use include MsrB, methionine sulfoxide reductase (ambiguous), pMSR, methionine S-oxide reductase (ambiguous), selenoprotein R, methionine S-oxide reductase (R-form oxidizing), methionine sulfoxide reductase B, SelR, SelX, PilB, and pRMsr.

References

• Moskovitz J; Singh, VK; Requena, J; Wilkinson, BJ; Jayaswal, RK; Stadtman, ER (2002). "Purification and characterization of methionine sulfoxide reductases from mouse and Staphylococcus aureus and their substrate stereospecificity". Biochem. Biophys. Res. Commun. 290 (1): 62–5. doi:10.1006/bbrc.2001.6171. PMID 11779133.
• Taylor AB, Benglis DM, Dhandayuthapani S, Hart PJ (2003). "Structure of Mycobacterium tuberculosis methionine sulfoxide reductase A in complex with protein-bound methionine". J. Bacteriol. 185 (14): 4119–26. doi:10.1128/JB.185.14.4119-4126.2003. PMC 164888. PMID 12837786.
• Singh VK, Moskovitz J (2003). "Multiple methionine sulfoxide reductase genes in Staphylococcus aureus: expression of activity and roles in tolerance of oxidative stress". Microbiology. 149 (Pt 10): 2739–47. doi:10.1099/mic.0.26442-0. PMID 14523107.
• Boschi-Muller S, Olry A, Antoine M, Branlant G (2005). "The enzymology and biochemistry of methionine sulfoxide reductases". Biochim. Biophys. Acta. 1703 (2): 231–8. doi:10.1016/j.bbapap.2004.09.016. PMID 15680231.
• Ezraty B, Aussel L, Barras F (2005). "Methionine sulfoxide reductases in prokaryotes". Biochim. Biophys. Acta. 1703 (2): 221–9. doi:10.1016/j.bbapap.2004.08.017. PMID 15680230.
• Weissbach H, Resnick L, Brot N (2005). "Methionine sulfoxide reductases: history and cellular role in protecting against oxidative damage". Biochim. Biophys. Acta. 1703 (2): 203–12. doi:10.1016/j.bbapap.2004.10.004. PMID 15680228.
• Kauffmann B, Aubry A, Favier F (2005). "The three-dimensional structures of peptide methionine sulfoxide reductases: current knowledge and open questions". Biochim. Biophys. Acta. 1703 (2): 249–60. doi:10.1016/j.bbapap.2004.09.008. PMID 15680233.
• Vougier S, Mary J, Friguet B (2003). "Subcellular localization of methionine sulphoxide reductase A (MsrA): evidence for mitochondrial and cytosolic isoforms in rat liver cells". Biochem. J. 373 (Pt 2): 531–7. doi:10.1042/BJ20030443. PMC 1223498. PMID 12693988.
• Dorsselear A, Branlant G (2002). "Characterization of the methionine sulfoxide reductase activities of PILB, a probable virulence factor from Neisseria meningitidis". J. Biol. Chem. 277 (14): 12016–22. doi:10.1074/jbc.M112350200. PMID 11812798.
• Sagher D, Brunell D, Hejtmancik JF, Kantorow M, Brot N, Weissbach H (2006). "Thionein can serve as a reducing agent for the methionine sulfoxide reductases". Proc. Natl. Acad. Sci. U.S.A. 103 (23): 8656–61. doi:10.1073/pnas.0602826103. PMC 1592241. PMID 16735467.

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