L-Methionine-(R)-S-Oxide Reductase Activity
L-Methionine:thioredoxin-Disulfide S-Oxidoreductase [L-Methionine (R)-S-Oxide-Forming] Activity
Catalysis of the reaction: L-methionine + thioredoxin disulfide + H2O = L-methionine (R)-S-oxide + thioredoxin.