Methionine sulfoxide reductase B3 requires resolving cysteine residues for full activity and can act as a stereospecific methionine oxidase.
Cao Z, Mitchell L, Hsia O, Scarpa M, Caldwell ST, Alfred AD, Gennaris A, Collet JF, Hartley RC, Bulleid NJ. Biochem J. 2018 Feb 28; 475(4):827-838. Epub 2018 Feb 28.