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Originally published in Science Express on 23 March 2006
Science 28 April 2006:
Vol. 312. no. 5773, pp. 589 - 592
DOI: 10.1126/science.1122352
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Reports

A Voltage Sensor-Domain Protein Is a Voltage-Gated Proton Channel

Mari Sasaki,1,2,3 Masahiro Takagi,1,3 Yasushi Okamura1,2,3,4*

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.

1 Section of Developmental Neurophysiology, Okazaki Institute for Integrative Bioscience, Higashiyama 5-1, Myodaiji-cho, Okazaki, Aichi 444-8787, Japan.
2 The Graduate University for Advanced Studies, Higashiyama 5-1, Myodaiji-cho, Okazaki, Aichi 444-8787, Japan.
3 National Institute for Physiological Sciences, National Institutes of Natural Sciences, Higashiyama 5-1, Myodaiji-cho, Okazaki, Aichi 444-8787, Japan.
4 Neuroscience Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, Higashi 1-1-1, Tsukuba, Ibaraki 305-8566, Japan.

Note added in proof: D. Clapham's laboratory reports similar properties of a human ortholog, Hv1 (22).

* To whom correspondence should be addressed. E-mail: yokamura{at}nips.ac.jp

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