although cys 147 is an active site residue in histidine decarboxylase from lactobacillus 30a , the absence of a corresponding residue in the c. perfringens enzyme confirms previous indications ( recsei , p. a. , and snell , e. e. ( 1982 ) j. biol . chem . 257 , 7196-7202 ) that this sh group is not essential for decarboxylase action .
C0019605
histidine decarboxylase
C0007054
decarboxylase