Arginine and Ornithine Decarboxylases, the Polyamine Biosynthetic Enzymes of Mung Bean Seedlings 1

AUTOR(ES)

Altman, Arie

RESUMO

General properties and relative activities of l-arginine decarboxylase (ADC) (EC 4.1.1.19) and l-ornithine decarboxylase (ODC) (EC 4.1.1.17), two important enzymes in putrescine and polyamine biosynthesis, were investigated in mung bean (Vigna radiata L.) tissues. Both activities increase linearly with increasing concentrations of crude enzyme, but the increase in ADC activity is considerably greater. The decarboxylation reaction is linear for up to 30 to 60 minutes, and both enzymes have a pH optimum of 7.2. α-Difluoromethyl-ornithine inhibits ODC activity of excised roots, while increasing ADC activity.

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