L-methionyl-[protein] + [thioredoxin]-disulfide + H2O => L-methionyl-(R)-S-oxide-[protein] + [thioredoxin]-dithiol
l-methionyl-[protein] + [thioredoxin]-disulfide + h2o => l-methionyl-(r)-s-oxide-[protein] + [thioredoxin]-dithiol