Catalysis of the reaction: peptide-L-methionine + H2O + thioredoxin disulfide = peptide-L-methionine (R)-S-oxide + thioredoxin. Can act on oxidized methionine in peptide linkage with specificity for the R enantiomer. Thioredoxin disulfide is the oxidized form of thioredoxin.
Source:EC:1.8.4.12,
GOC:vw,
GOC:mah,
RHEA:24164