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The solute carrier SLC9C1 is a Na+/H+-exchanger gated by an S4-type voltage-sensor and cyclic-nucleotide binding

MPS-Authors
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Windler,  Florian
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Bönigk,  Wolfgang
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Körschen,  Heinz Gerd
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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

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Strünker,  Timo
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Seifert,  Reinhard
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Kaupp,  Ulrich Benjamin
Department of Molecular Sensory Systems, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Citation

Windler, F., Bönigk, W., Körschen, H. G., Grahn, E., Strünker, T., Seifert, R., et al. (2018). The solute carrier SLC9C1 is a Na+/H+-exchanger gated by an S4-type voltage-sensor and cyclic-nucleotide binding. Nature Communications, 9: 2809. doi:10.1038/s41467-018-05253-x.


Cite as: http://hdl.handle.net/21.11116/0000-0003-4ADD-2
Abstract
Voltage-sensing (VSD) and cyclic nucleotide-binding domains (CNBD) gate ion channels for rapid electrical signaling. By contrast, solute carriers (SLCs) that passively redistribute substrates are gated by their substrates themselves. Here, we study the orphan sperm-specific solute carriers SLC9C1 that feature a unique tripartite structure: an exchanger domain, a VSD, and a CNBD. Voltage-clamp fluorimetry shows that SLC9C1 is a genuine Na+/H+ exchanger gated by voltage. The cellular messenger cAMP shifts the voltage range of activation. Mutations in the transport domain, the VSD, or the CNBD strongly affect Na+/H+ exchange, voltage gating, or cAMP sensitivity, respectively. Our results establish SLC9C1 as a phylogenetic chimaera that combines the ion-exchange mechanism of solute carriers with the gating mechanism of ion channels. Classic SLCs slowly readjust changes in the intra-and extracellular milieu, whereas voltage gating endows the Na+/H+ exchanger with the ability to produce a rapid pH response that enables downstream signaling events.