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. 1984 Jan;45(1):289–299. doi: 10.1016/S0006-3495(84)84155-7

Single potassium channels with delayed rectifier behavior from lobster axon membranes.

R Coronado, R Latorre, H G Mautner
PMCID: PMC1435250  PMID: 6324909

Abstract

Single-channel potassium currents from lobster axon membranes were studied in planar bilayers made from monolayers. Channel-opening events are grouped by time, forming bursts with an average duration of 4.5 ms. The mean open time at 0 mV is 1.8 ms. The frequency of bursts is voltage dependent, increasing e-fold per 12-16 mV. At sufficiently high positive voltages, channels inactivate. Measured from reversal potentials, channels discriminate against Na+ by a permeability ratio PNa/PK of 1:30. The channel is blocked by tetraethylammonium and nonyltrimethylammonium in a voltage-dependent manner and at concentrations similar to those used in whole-axon experiments. Voltage-dependent block by Cs+ suggests that more than one ion may occupy the channel simultaneously. The kinetics and selectivity of this channel suggest that purified axolemma contains active K+ channels that are likely to participate in delayed rectification in the lobster axon membrane.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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