- EMDB-2347: cryo-EM structure of the NavCt voltage-gated sodium channel -
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データベース: EMDB / ID: EMD-2347
タイトル
cryo-EM structure of the NavCt voltage-gated sodium channel
マップデータ
Cryo-EM structure of voltage-gated Na+ channel
試料
試料: voltage-gated sodium channel
タンパク質・ペプチド: voltage-gated sodium channel
キーワード
Voltage-gated sodium ion channel / tetrameric ion channel
機能・相同性
Voltage-dependent channel domain superfamily / Ion transport domain / Ion transport domain / Ion transport protein / monoatomic ion channel activity / membrane / Ion transport protein
ジャーナル: J Mol Biol / 年: 2013 タイトル: Two alternative conformations of a voltage-gated sodium channel. 著者: Ching-Ju Tsai / Kazutoshi Tani / Katsumasa Irie / Yoko Hiroaki / Takushi Shimomura / Duncan G McMillan / Gregory M Cook / Gebhard F X Schertler / Yoshinori Fujiyoshi / Xiao-Dan Li / 要旨: Activation and inactivation of voltage-gated sodium channels (Navs) are well studied, yet the molecular mechanisms governing channel gating in the membrane remain unknown. We present two ...Activation and inactivation of voltage-gated sodium channels (Navs) are well studied, yet the molecular mechanisms governing channel gating in the membrane remain unknown. We present two conformations of a Nav from Caldalkalibacillus thermarum reconstituted into lipid bilayers in one crystal at 9Å 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 Nav 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.