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- W2885454574 abstract "Abstract Members of the TMEM16/ANO family of membrane proteins are Ca 2+ -activated phospholipid scramblases and/or Cl − channels. A membrane-exposed hydrophilic groove in these proteins serves as a shared translocation pathway for ions and lipids. However, the mechanism by which lipids gain access to and permeate through the groove remains poorly understood. Here, we combine quantitative scrambling assays and molecular dynamic simulations to identify the key steps regulating lipid movement through the groove. Lipid scrambling is limited by two constrictions defined by evolutionarily conserved charged and polar residues, one extracellular and the other near the membrane mid-point. The region between these constrictions is inaccessible to lipids and water molecules, suggesting that the groove is in a non-conductive conformation. A sequence of lipid-triggered reorganizations of interactions between these residues and the permeating lipids propagates from the extracellular entryway to the central constriction, allowing the groove to open and coordinate the headgroups of transiting lipids." @default.
- W2885454574 created "2018-08-22" @default.
- W2885454574 creator A5014370221 @default.
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- W2885454574 date "2018-08-14" @default.
- W2885454574 modified "2023-10-16" @default.
- W2885454574 title "Gating mechanism of the extracellular entry to the lipid pathway in a TMEM16 scramblase" @default.
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- W2885454574 doi "https://doi.org/10.1038/s41467-018-05724-1" @default.
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