- EMDB-41419: Local cryo-EM refinement map (Chain D N-terminal domain) for CorA... -
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基本情報
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データベース: EMDB / ID: EMD-41419
タイトル
Local cryo-EM refinement map (Chain D N-terminal domain) for CorA in complex with conformation-specific synthetic antibody C18 and 100 uM MgCl2, State MG0.1-1B
マップデータ
Local refinement map using mask around CorA Chain D N-terminal domain (residues 1-260)
試料
複合体: CorA in complex with conformation-specific sAB C18 and 100 uM MgCl2
キーワード
Ion Channel / Magnesium Channel / MEMBRANE PROTEIN
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM117372
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2026 タイトル: Conformational ensembles of the magnesium channel CorA reveal structural basis for channel gating. 著者: Satchal K Erramilli / Kamil Nosol / Krzysztof Pietrzak-Lichwa / Nicolaus Schmandt / Tian Li / Piotr Tokarz / Jingkai Hou / Minglei Zhao / Eduardo Perozo / Anthony A Kossiakoff / 要旨: In prokaryotes, CorA is the primary influx pathway for magnesium, a critical divalent cation in cellular physiology and biochemistry. Mechanistic studies show that homopentameric CorA is regulated ...In prokaryotes, CorA is the primary influx pathway for magnesium, a critical divalent cation in cellular physiology and biochemistry. Mechanistic studies show that homopentameric CorA is regulated through an intracellular [Mg]-dependent negative feedback loop, involving the asymmetric participation of individual subunits. To understand the connection between asymmetry and activation, we used single-particle cryo-EM to solve sixteen structures of nanodisc-reconstituted CorA. We utilized conformation-specific synthetic antibodies to stabilize subtle but significant conformational differences in the cryo-EM structures. Our results demonstrate that CorA exists as a set of conformational ensembles, where population size inversely correlates with intracellular Mg concentration. These ensembles include channels with a variety of pore conformations, both constricted and dilated, suggesting a spectrum of active CorA functional states. The ensembles connect asymmetric structural transitions in the cytoplasmic domain with conformational changes in the permeation pathway via an electrostatic network, ultimately controlling channel-gating events. We believe that these results establish a framework for understanding magnesium homeostasis in prokaryotic systems.