- EMDB-71088: MscS in Glyco-DIBMA Native Nanodiscs (C7 symmetry) -
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データベース: EMDB / ID: EMD-71088
タイトル
MscS in Glyco-DIBMA Native Nanodiscs (C7 symmetry)
マップデータ
Single particle cryo-EM map of mechanosensitive channel MscS from Escherichia coli in Glyco-DIBMA polymer native nanodiscs at an overall resolution of 2.99 A sharpened and filtered
試料
複合体: MscS in Glyco-DIBMA Native Nanodiscs (C7 symmetry)
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)
Z1A HD008998
米国
National Science Foundation (NSF, United States)
DGE 1840340
米国
National Science Foundation (NSF, United States)
CHE-1944892/2326678
米国
引用
ジャーナル: bioRxiv / 年: 2025 タイトル: The lipid-mediated mechanism of mechanosensitive channel MscS inactivation. 著者: Elissa Moller / Madolyn Britt / Fei Zhou / Hyojik Yang / Andriy Anishkin / Robert Ernst / Juan M Vanegas / Sergei Sukharev / Doreen Matthies 要旨: Interpretations of experimental conformations of mechanosensitive channels gated by 'force from lipids' become more reliable when native lipids are preserved in the structures. MscS is an adaptive ...Interpretations of experimental conformations of mechanosensitive channels gated by 'force from lipids' become more reliable when native lipids are preserved in the structures. MscS is an adaptive osmolyte release valve that regulates turgor in osmotically stressed cells. MscS promptly opens under abrupt super-threshold tensions in the membrane, but at lower and more gradually applied tensions, it silently inactivates from the closed state. A central question has been whether to assign the commonly observed non-conductive conformation with splayed peripheral helices to a closed or inactivated state. We present a 3-Å MscS cryo-EM structure obtained in Glyco-DIBMA polymers, which avoid complete lipid removal. Within the complex, we observe densities for endogenous phospholipids intercalating between the peripheral and pore-lining helices. The lipidomic analysis shows a 2-3 fold enrichment of phosphatidylglycerol in Glyco-DIBMA-extracted MscS samples. The computed pressure of these lipids on the protein surface enforces the characteristic kinks in the pore-lining helices, sterically stabilizing the separation of the peripheral helices. Mutations of residues coordinating lipids in the crevices eliminate inactivation, allowing us to classify this group of structures as the inactivated state. Our study reveals a novel inactivation mechanism in which intercalated lipids physically decouple the tension-sensing helices from the gate.
ダウンロード / ファイル: emd_71088.map.gz / 形式: CCP4 / 大きさ: 178 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Single particle cryo-EM map of mechanosensitive channel MscS from Escherichia coli in Glyco-DIBMA polymer native nanodiscs at an overall resolution of 2.99 A sharpened and filtered