Voltage-dependent K channels in protoplasts of trap-lobe cells ofDionaea muscipula |
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| Authors: | T Iijima S Hagiwara |
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| Institution: | (1) Department of Physiology, Ahmanson Laboratory of Neurobiology, Brain Research Institute and Jerry Lewis Neuromuscular Research Center, U.C.L.A., 90024 Los Angeles, California;(2) Present address: Electrotechnical Laboratory, 1-1-4 Umezono, Sakra-mura Niihari-gun, 305 Ibaraki, Japan |
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| Abstract: | Summary The outward rectification of the K+ current in mesophyll cell protoplasts from trap-lobes ofDionaea muscipula was studied with the patch-clamp technique. The rectification had instantaneous and time-dependent components. Changes in K+]
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strongly affected the conductance voltage relation of the plasma membrane while changes in K+]
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had little effect on the relation. Thus, the outward rectification depends on the membrane voltage and the concentration of intracellular K+. Corresponding single-channel activities were observed both in the intact membrane (cell-attached recording) and in excised patches. The single-channel conductance was about 3.3 pS with symmetrical solutions containing 30mm K+. |
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| Keywords: | Venus's-flytrap protoplast K+ current rectification single channel |
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