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- W2006161439 abstract "Alamethicin appears to allow voltage-dependent lipid exchange (flip-flop) between leaflets of a planar bilayer. In membranes with one leaflet of phosphatidyl serine and one of phosphatidyl ethanolamine, the shape of the nonactin current-voltage curve accurately reports the difference in surface potential between the two sides of the membrane. The surface potential is itself a good measure of membrane asymmetry. Alamethicin added to the bathing solutions of an asymmetric membrane does not per se reduce the membrane asymmetry, but turning on the alamethicin conductance by application of a voltage pulse does. Immediately after application of a voltage pulse, large enough to turn on the alamethicin conductance, the asymmetry of the nonactin-K+ current voltage curve decreases, in some cases, nearly to zero. During the pulse, the alamethicin conductance activates if a decrease in surface potential favors turn-on of the alamethicin conductance or inactivates if a decrease in surface potential favors turn-off of the alamethicin conductance. After the pulse, the nonactin-K+ asymmetry returns to its original value if the alamethicin conductance is not turned on. The time-course of this return allows an estimate of the diffusion constant of lipid in the planar bilayer. The value obtained is 5.1 x 10(-8) cm2/s." @default.
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- W2006161439 title "Voltage-dependent lipid flip-flop induced by alamethicin" @default.
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- W2006161439 doi "https://doi.org/10.1016/s0006-3495(81)84901-6" @default.
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