[Effect of nitrosomethylurea and 1,4-bis-diazoacetylbutane on alkaline ribonuclease activity]

It was shown that at 37 degrees C nitrosomethylurea causes an 8-fold increase (as compared to the normal) of the activity of alkaline ribonuclease. 1,4-Bis-diazoacetylbutane also activated alkaline ribonuclease at 37 degrees C. A dependence of the effect of chemical mutagens studied on the activity of alkaline ribonuclease on their concentration was observed. The activation of ribonuclease by NMU and DAB affords a possibility to understand the molecular mechanisms of the action of chemical mutagens on the metabolism.