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• W2117429193 abstract "Why agonist-induced activation of the nicotinic acetylcholine receptor (nAcChoR) fails completely in the absence of cholesterol is unknown. Affinity-purified nAcChoRs from Torpedo reconstituted into 1,2-dioleoyl-sn-glycero-3-phosphatidylcholine/1,2-dioleoyl-sn-glycero-3-phosphate/steroid bilayers at mole ratios of 58:12:30 were used to distinguish between three regions of the membrane where cholesterol might act: the lipid bilayer, the lipid–protein interface, or sites within the protein itself. In the bilayer, the role of fluidity has been ruled out and certain neutral lipids can substitute for cholesterol [C. Sunshine, M.G. McNamee, Biochim. Biophys. Acta 1191 (1994) 59–64]; therefore, we first tested the hypothesis that flip-flop of cholesterol across the membrane is important; a plausible mechanism might be the relief of mechanical bending strain induced by a conformation change that expands the two leaflets of the bilayer asymmetrically. Cholesterol analogs prevented from flipping by charged groups attached to the 3-position's hydroxyl supported channel opening, contrary to this hypothesis. The second hypothesis is that interstitial cholesterol binding sites exist deep within the nAcChoR that must be occupied for channel opening to occur. When cholesterol hemisuccinate was covalently `tethered' to the glycerol backbone of phosphatidylcholine, channel opening was still supported. Thus, if there are functionally important cholesterol sites, they must be very close to the lipid–protein interface and might be termed periannular." @default.
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• W2117429193 date "1998-03-01" @default.
• W2117429193 modified "2023-10-13" @default.
• W2117429193 title "Where does cholesterol act during activation of the nicotinic acetylcholine receptor?" @default.
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• W2117429193 doi "https://doi.org/10.1016/s0005-2736(97)00280-0" @default.
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