Distribution and Properties of a Potassium-dependent Asparaginase Isolated from Developing Seeds of Pisum sativum and Other Plants 1

AUTOR(ES)

Sodek, Ladaslav

RESUMO

Asparaginase (EC 3.5.1.1) was isolated from the developing seed of Pisum sativum. The enzyme is dependent upon the presence of K+ for activity, although Na+ and Rb+ may substitute to a lesser extent. Maximum activity was obtained at K+ concentrations above 20 millimolar. Potassium ions protected the enzyme against heat denaturation. The enzyme has a molecular weight of 68,300.

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