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Gating interaction maps reveal a noncanonical electromechanical coupling mode in the Shaker K+ channel
Univ Wisconsin, SMPH, Dept Neurosci, Madison, WI 53706 USA.;NINDS, Mol Physiol & Biophys Sect, Porter Neurosci Res Ctr, NIH, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA..
KTH, School of Engineering Sciences (SCI), Applied Physics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
Univ Wisconsin, SMPH, Dept Neurosci, Madison, WI 53706 USA.;Cellular Dynam Int Inc, Madison, WI USA..
KTH, School of Engineering Sciences (SCI), Applied Physics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
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2018 (English)In: Nature Structural & Molecular Biology, ISSN 1545-9993, E-ISSN 1545-9985, Vol. 25, no 4, p. 320-326Article in journal (Refereed) Published
Abstract [en]

Membrane potential regulates the activity of voltage-dependent ion channels via specialized voltage-sensing modules, but the mechanisms involved in coupling voltage-sensor movement to pore opening remain unclear owing to a lack of resting state structures and robust methods to identify allosteric pathways. Here, using a newly developed interaction-energy analysis, we probe the interfaces of the voltage-sensing and pore modules in the Drosophila Shaker K+ channel. Our measurements reveal unexpectedly strong equilibrium gating interactions between contacts at the S4 and S5 helices in addition to those between S6 and the S4-S5 linker. Network analysis of MD trajectories shows that the voltage-sensor and pore motions are linked by two distinct pathways: a canonical pathway through the S4-S5 linker and a hitherto unknown pathway akin to rack-and-pinion coupling involving the S4 and S5 helices. Our findings highlight the central role of the S5 helix in electromechanical transduction in the voltage-gated ion channel (VGIC) superfamily.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018. Vol. 25, no 4, p. 320-326
National Category
Biochemistry and Molecular Biology
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URN: urn:nbn:se:kth:diva-226784DOI: 10.1038/s41594-018-0047-3ISI: 000429301800005PubMedID: 29581567Scopus ID: 2-s2.0-85044457903OAI: oai:DiVA.org:kth-226784DiVA, id: diva2:1204429
Funder
Science for Life Laboratory - a national resource center for high-throughput molecular bioscience
Note

QC 20180508

Available from: 2018-05-08 Created: 2018-05-08 Last updated: 2018-06-04Bibliographically approved

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