[Effect of ionizing radiation on the properties of rat liver phosphoprotein phosphatase].

Phosphoproteidphosphatase (3.1.3.16) of high specificity for lysil-tRNA-synthetase (6.1.1.6) and proteins of high-molecular-weight multienzyme complex of aminoacyl-tRNA-synthetases (6.1.1.) was isolated from rat liver. Irradiation of animals with an absolutely lethal dose of 0.21 C/kg decreased phosphoproteidphosphatase activity: a 3-4-fold decrease was noted 1 hr following irradiation. The activity of the enzyme isolated 24 hr after irradiation increased but did not reach the control level.