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Mechanism of activation of Na, K-ATPase in nerve fibres during rhythmic excitation.

The mechanism of activation of Na, K-ATPase in nerve fibres during rhythmic excitation was studied. 3H-ouabain binding to the nerve was found to be dependent on the frequency of rhythmic excitation. During rhythmic excitation 3H-ouabain binding was increased in all nerves tested. The maximum of 3H-ouabain binding in squid and crab nerves was observed at 10 impulses/s, and in frog nerve at 100 impulses/s. The level of bound glycoside decreased during high-frequency excitation. Rhythmic excitation did not change Na, K-ATPase affinity to ouabain, but it appeared to increase the concentration of ouabain sensitive sites in the nerve membrane. The enhancement of 3H-ouabain binding to nerve during rhythmic excitation is interpreted as arising from transformation of "inactive" forms of the enzyme to "active" ones.