Protein methionine S oxide reductase

Protein-methionine-S-oxide reductase (EC 1.8.4.6, methionine sulfoxide (protein) reductase, methionine sulfoxide peptide reductase, protein (methionine sulfoxide) reductase, Met(O)-peptide reductase, peptide methionine sulfoxide reductase, protein-L-methionine:oxidized-thioredoxin S-oxidoreductase) is an enzyme with systematic name protein-L-methionine:thioredoxin-disulfide S-oxidoreductase. This enzyme catalyses the following chemical reaction

protein L-methionine + thioredoxin disulfide ⇌ protein L-methionine S-oxide + thioredoxin

Dithiothreitol can replace a reduced thioredoxin in the reverse reaction.