On the Effects of X-Rays upon Enzyme Acti­vity. II. On the Effect of X-Rays upon the Proteolytic Action of Papayotin.

1. The proteolytic action of papayotin is activated by X-ray irradiation with 60 r and 1000 r, and inhibited with 200 r and 400 r. 2. The influences of X-rays upon papayotin are direct and remain unchanged for definite periods of time. 3. The proteolytic action of papayotin show wavy phenomena which correspond to the time and dose of the X-ray irradiation. 4. The proteolytic action of papayotin is considered to be inhibited by the decomposition products (polypeptides) of substrate only in the presence of some other factors.