期刊
JOURNAL OF MOLECULAR BIOLOGY
卷 425, 期 22, 页码 4074-4088出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2013.06.036
关键词
voltage-gated sodium channel; electron crystallography; cryo-electron microscopy
资金
- PSI FOKO
- Japan New Energy and Industrial Technology Development Organization
- National Institute of Biomedical Innovation
- Grants-in-Aid for Scientific Research [22770147, 22227004, 23570191] Funding Source: KAKEN
Activation and inactivation of voltage-gated sodium channels (Nays) are well studied, yet the molecular mechanisms governing channel gating in the membrane remain unknown. We present two conformations of a Nay from Caldalkalibacillus thermarum reconstituted into lipid bilayers in one crystal at 9 angstrom resolution based on electron crystallography. Despite a voltage sensor arrangement identical with that in the activated form, we observed two distinct pore domain structures: a prominent form with a relatively open inner gate and a closed inner-gate conformation similar to the first prokaryotic Nay structure. Structural differences, together with mutational and electrophysiological analyses, indicated that widening of the inner gate was dependent on interactions among the S4-S5 linker, the N-terminal part of S5 and its adjoining part in S6, and on interhelical repulsion by a negatively charged C-terminal region subsequent to S6. Our findings suggest that these specific interactions result in two conformational structures. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
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