Breakdown of Na+/K+‐exchanging ATPase phosphoenzymes formed from ATP and from inorganic phosphate during Na+‐ATPase activity.

The reactivity towards Na+ and K+ of Na+/K+‐ATPase phosphoenzymes formed from ATP and Pi during Na+‐ATPase turnover and that obtained from Pi in the absence of ATP, Na+ and K+ was studied. The phosphoenzyme formed from Pi in the absence of cycling and with no Na+ or K+ in the medium showed a biphasi...

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