A Kinetic Map of the Homomeric Voltage-Gated Potassium Channel (Kv) Family

The voltage-gated potassium (Kv) channels, encoded by 40 genes, repolarize all electrically excitable cells, including plant, cardiac, and neuronal cells. Although these genes were fully sequenced decades ago, a comprehensive kinetic characterization of all Kv channels is still missing, especially near physiological temperature. Here, we present a standardized kinetic map of the 40 homomeric Kv channels systematically characterized at 15, 25, and 35 degrees C. Importantly, the Kv kinetics at 35 degrees C differ significantly from commonly reported kinetics, usually performed at room temperature. We observed voltage-dependent Q(10) for all active Kv channels and inherent heterogeneity in kinetics for some of them. Kinetic properties are consistent across different host cell lines and conserved across mouse, rat, and human. All electrophysiology data from all Kv channels are made available through a public website (Channelpedia). This dataset provides a solid foundation for exploring kinetics of heteromeric channels, roles of auxiliary subunits, kinetic modulation, and for building accurate Kv models.


Published in:
Frontiers in Cellular Neuroscience, 13, 358
Year:
Aug 20 2019
ISSN:
1662-5102
Keywords:
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 Record created 2019-09-04, last modified 2020-04-16

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