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We have examined the interactions of the histidine-specific reagent diethyl pyrocarbonate (DEPC) with the components of the rat hepatic glucose-6-phosphatase system (EC 3.1.3.9). DEPC is the first known reagent that satisfies the criteria of an active-site-specific label for the phosphohydrolase component. (a) It inactivates through formation of a stable covalent bond. (b) It is effective at reasonably low concentrations (2-4 mM) under relatively mild conditions (e.g. 30 degrees C at neutral pH). (c) Inactivation is substantially blocked by glucose 6-phosphate, Pi and NaF, compounds which are known to interact quite specifically with the phosphohydrolase. (d) Under conditions where glucose 6-phosphate and NaF protect the enzyme, no protection is provided against DEPC-mediated inactivation of two other functional components of the membrane, the glucose 6-phosphate translocase and UDP-glucuronyltransferase. DEPC also shows potential for use at 0 degree C as a label for UDP-glucuronyltransferase.

Specific inactivation of the phosphohydrolase component of the hepatic microsomal glucose-6-phosphatase system by diethyl pyrocarbonate