The conversion of serine at the active site of subtilisin to cysteine: a "chemical mutation".
D055598:Chemical Phenomena; D002621:Chemistry; D003545:Cysteine; D010450:Endopeptidases; D009154:Mutation; D012694:Serine
D012694:Serine; D010450:Endopeptidases; D003545:Cysteine