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Protease K1 activity initiates the degradation of the Kunitz soybean trypsin inhibitor (KSTI) during germination and early seedling growth. This enzyme was purified nearly 1300-fold from the cotyledons of 4-day-old soybean (Glycine max [L.] Merrill) seedlings. Protease K1 is a cysteine protease with a molecular weight of approximately 29,000. It cleaves the native form of KSTI, Ti(a), to Ti(a) (m), the same modified form observed in vivo. In addition to attacking KSTI, protease K1 is also active toward the major Bowman-Birk soybean trypsin inhibitor, as well as the alpha, alpha', and beta subunits of soybean beta-conglycinin. The properties and temporal variation of protease K1 during germination indicate that it is responsible for initiating the degradation of both KSTI and Bowman-Birk soybean trypsin inhibitor in the soybean cotyledon.

Initiation of the Degradation of the Soybean Kunitz and Bowman-Birk Trypsin Inhibitors by a Cysteine Protease