ArticleThe Journal of membrane biology1994
A voltage-sensitive cation channel present in clusters in lobster skeletal muscle membrane.
Article in The Journal of membrane biology, 1994. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The single channel properties of a voltage-sensitive cation channel are described in a study of ion channel activity in enzymatically induced blebs of lobster skeletal muscle membrane. This cation channel, one of several that are spontaneously active in excised patches from bleb membrane, can be distinguished from other channels on the basis of its large single channel conductance (293 pS), voltage-sensitive gating properties, the presence of a subconductance state of the fully open channel, and a weak selectivity for K > Na. At hyperpolarizing voltages, this channel displays flickering or bursting behavior, and a single state of the fully open channel is observed. At depolarizing voltages, the mean channel open time increases and a second longer-lived open state is observed. The voltage dependence of the mean channel open time and the linear i-V relation of this channel predict that the macroscopic current carried through this cation channel would be outwardly rectifying. Channels of this type are infrequently observed in this preparation, but when present in the patch are often present in multiple copies. We describe a statistical test for examining the clustering of ion channels in excised patches of membrane. The result of this test shows that the cation channels appear in clusters in the blebs.
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