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  • Title: Voltage-dependent pump currents of the sarcoplasmic reticulum Ca2(+)-ATPase in planar lipid membranes.
    Author: Eisenrauch A, Bamberg E.
    Journal: FEBS Lett; 1990 Jul 30; 268(1):152-6. PubMed ID: 2143482.
    Abstract:
    Sarcoplasmic reticulum vesicles containing largely Ca2(+)-ATPase were incorporated into planar lipid membranes. The ATPase was activated by a UV flash-induced concentration jump of ATP from a photolabile caged ATP. Under these conditions stationary pump currents were observed. The dependence of these pump currents on applied voltages was investigated. The current-voltage curve of the Ca2(+)-ATPase shows monotonously increasing pump currents with increasing positive potentials of the ATP containing compartment. This indicates the existence of electrogenic steps in the direction of the transported Ca2+ ions. From the extrapolated reversal potentials of the curve is concluded that less than four positive net charges are transported per hydrolyzed ATP.
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