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Science. 2006 Apr 28;312(5773):589-92. Epub 2006 Mar 23.

A voltage sensor-domain protein is a voltage-gated proton channel.

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  • 1Section of Developmental Neurophysiology, Okazaki Institute for Integrative Bioscience, Higashiyama 5-1, Myodaiji-cho, Okazaki, Aichi 444-8787, Japan.

Abstract

Voltage-gated proton channels have been widely observed but have not been identified at a molecular level. Here we report that a four-transmembrane protein similar to the voltage-sensor domain of voltage-gated ion channels is a voltage-gated proton channel. Cells overexpressing this protein showed depolarization-induced outward currents accompanied by tail currents. Current reversal occured at equilibrium potentials for protons. The currents exhibited pH-dependent gating and zinc ion sensitivity, two features which are characteristic of voltage-gated proton channels. Responses of voltage dependence to sequence changes suggest that mouse voltage-sensor domain-only protein is itself a channel, rather than a regulator of another channel protein.

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PMID:
16556803
[PubMed - indexed for MEDLINE]
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