Role of cysteine-82 in the catalytic mechanism of human S-adenosylmethionine decarboxylase.
Xiong H, Stanley B A, Pegg A E·Biochemistry
S-Adenosylmethionine decarboxylase is a pyruvate-dependent enzyme. The enzyme forms a Schiff base with substrate, S-adenosylmethionine, through the pyruvoyl moiety. This facilitates the release of CO2 from the substrate, which must then be protonated on the alpha carbon in order to permit hydrolysis of the Schiff base…