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Old 12-08-2015, 05:41 AM   #1 (permalink)
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running electrogenic Na pump in squid giant axons

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Previous The sodium pump of animal cells is electrogenic1,2, that is, it normally exports more sodium ions than it imports potassium ions3. In the squid giant axon, the resulting net outward electric current4has a density of a few A cm and contributes 1 mV to the resting membrane potential5,6. The pump is driven by the free energy of hydrolysis of ATP, and in some instances7 it has been possible to run the pump backwards and synthesize ATP by lowering the [ATP]/[ADP] [Pi] ratio and steepening the transmembrane Na and K gradients. We demonstrate reversal of the sodium pump of squid giant axon, and find that backward pumping indeed produces a net inward electric current. This current is voltage sensitive. Our observations have mechanistic implications for models of the sodium pump.
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