Voltage and pH difference across the membrane control the S4 voltage-sensor 
motion of the Hv1 proton channel

Schladt, T. Moritz; Berger, Thomas Klaus

doi:10.1038/s41598-020-77986-z

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Voltage and pH difference across the membrane control the S4 voltage-sensor motion of the Hv1 proton channel

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Schladt, T. Moritz
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Berger, Thomas Klaus
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Citation

Schladt, T. M., & Berger, T. K. (2020). Voltage and pH difference across the membrane control the S4 voltage-sensor motion of the Hv1 proton channel. Scientific Reports, 10: 21293. doi:10.1038/s41598-020-77986-z.

Cite as: https://hdl.handle.net/21.11116/0000-0007-9759-B

Abstract

The voltage-gated proton channel Hv1 is expressed in a variety of cells, including macrophages,
sperm, and lung epithelial cells. Hv1 is gated by both the membrane potential and the diference
between the intra- and extracellular pH (ΔpH). The coupling of voltage- and ∆pH-sensing is such
that Hv1 opens only when the electrochemical proton gradient is outwardly directed. However, the
molecular mechanism of this coupling is not known. Here, we investigate the coupling between
voltage- and ΔpH-sensing of Ciona intestinalis proton channel (ciHv1) using patch-clamp fuorometry
(PCF) and proton uncaging. We show that changes in ΔpH can induce conformational changes of the
S4 voltage sensor. Our results are consistent with the idea that S4 can detect both voltage and ΔpH.