+検索条件
-Structure paper
タイトル | Structural basis for mechanotransduction in a potassium-dependent mechanosensitive ion channel. |
---|---|
ジャーナル・号・ページ | Nat Commun, Vol. 13, Issue 1, Page 6904, Year 2022 |
掲載日 | 2022年11月12日 |
著者 | Jonathan Mount / Grigory Maksaev / Brock T Summers / James A J Fitzpatrick / Peng Yuan / |
PubMed 要旨 | Mechanosensitive channels of small conductance, found in many living organisms, open under elevated membrane tension and thus play crucial roles in biological response to mechanical stress. Amongst ...Mechanosensitive channels of small conductance, found in many living organisms, open under elevated membrane tension and thus play crucial roles in biological response to mechanical stress. Amongst these channels, MscK is unique in that its activation also requires external potassium ions. To better understand this dual gating mechanism by force and ligand, we elucidate distinct structures of MscK along the gating cycle using cryo-electron microscopy. The heptameric channel comprises three layers: a cytoplasmic domain, a periplasmic gating ring, and a markedly curved transmembrane domain that flattens and expands upon channel opening, which is accompanied by dilation of the periplasmic ring. Furthermore, our results support a potentially unifying mechanotransduction mechanism in ion channels depicted as flattening and expansion of the transmembrane domain. |
リンク | Nat Commun / PubMed:36371466 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.41 - 4.97 Å |
構造データ | EMDB-26823, PDB-7uw5: EMDB-26845, PDB-7ux1: EMDB-26851: WT EcMscK in a closed conformation EMDB-26854: EcMscK in an intermediate conformation EMDB-26872: Locally refined core of EcMscK in a closed conformation EMDB-26875: Locally refined core of EcMscK G924S in a closed conformation EMDB-26876: Locally refined core of EcMscK G924S in an intermediate conformation EMDB-26877: Locally refined core of EcMscK in an open conformation |
由来 |
|
キーワード | TRANSPORT PROTEIN / MEMBRANE PROTEIN / MECHANOSENSATION / ION CHANNEL |