Some Kinetic Singularities of Mg2+-Dependent Mn-ATPase in Rat Brain Synaptic Membranes
Tóm tắt
Mn2+ stimulated change of Mg-ATPase activity has been found in the synaptic fraction of rat brain that was named Mn-ATPase. Investigation of the molecular mechanism has shown that Mn-ATPase is a multi-sited enzyme system whose minimum functional unit is a dimer. Its substrate is the MgATP complex. The number of sites for Mn2+ as for essential activators and that of full-effect inhibitors are equal, n = m = 1. Studying regulation of the Mn-ATPase system by Mg2+ has shown that Mg2+ represents a double-sided effect modifier, namely, it activates the enzyme system at low concentration but inhibits at high concentration. Supposedly, binding–release of MgATP and Mg2+ from the enzyme would be performed by a randomized mechanism. When analyzing experiments by using the kinetic method of complex curves, a “minimal model” for Mn-ATPase has been created.
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