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Modulation of hydrolytic activity of plasmalemma H+-ATPase at various temperatures by K+-diffusion potential Delta Psi

Modulation of hydrolytic activity of plasmalemma H+-ATPase at various temperatures by K+-diffusion potential Delta Psi

Russian Journal of Plant Physiology 44(5): 623-629

The influence of valinomycin-induced K+-diffusion potential ( Delta Psi D) on hydrolytic activity of H+-ATPase at 24 degrees and 6 degrees C was studied on plasma membranes (PM) isolated from Cucurbita pepo stem cells. Shifting Delta Psi D from 0 to 41 and 87 mV accelerated hydrolysis of ATP. This stimulation by Delta Psi D was manifested in quantitative rather than qualitative changes, most prominent at an early stage after ATP addition (from 0 to 0.5 min).

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