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Degradation of Argininosuccinate Lyase by a Protease Synthesized in Soybean Cell Suspension Cultures ¹

^a Department of Biochemistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

Suspension cultures of soybean (Glycine max L.) were shown to contain protease activity which could be inhibited by the addition of protease inhibitors such as p-hydroxymercuribenzoate and ethylenediaminetetraacetic acid. The use of these inhibitors, coupled with studies of the rate of degradation of argininosuccinate lyase (argininosuccinate-lyase = L-arginino-succinate arginine-lyase, EC 4.3.2.1) in extracts of cell cultures grown for 24 hours led to the hypothesis that a metal-dependent protease is synthesized by the cells after 24 hours of growth, to remove the lyase enzyme.