This enzyme repairs damaged proteins. Methionine sulfoxide in proteins is reduced to methionine.

1: Peptide methionine sulfoxide reductase contributes to the maintenance of adhesins in three major pathogens. Wizemann TM, Moskovitz J, Pearce BJ, Cundell D, Arvidson CG, So M, Weissbach H, Brot N, Masure HR; Proc Natl Acad Sci USA 1996;93:7985-7990. PMID:8755589

2: Cloning the expression of a mammalian gene involved in the reduction of methionine sulfoxide residues in proteins. Moskovitz J, Weissbach H, Brot N; Proc Natl Acad Sci U S A 1996;93:2095-2099. PMID:8700890