[Kinetic patterns of bacterial hydrogenase inactivation].

Kinetics of inactivation of hydrogenases is exemplified with the enzyme from Chloropseudomonas ethylica. The effect of gaseous phase, temperature, pH on the inactivation kinetics has been studied. Inactivation of the hydrogenase during incubation of an enzyme solution in air has been studied. Analysis of the kinetic data allowed the conclusion to be made that inactivation involves two forms of the enzyme which differ in their activity and resistance to inactivating actions. Stabilities of the mean time of operation of hydrogenases from Chloropseudomonas ethylica and Thiocapsa roseopersicina are compared. The mechanism of inactivation of hydrogenases from the two sources were found to be similar in many ways.