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• W2024587530 endingPage "126" @default.
• W2024587530 startingPage "117" @default.
• W2024587530 abstract "The nicotinic acetylcholine receptor (nAChR) has been reconstituted in POPC vesicles at high lipid-protein (L/P) ratios for the preparation of supported lipid bilayers with a low protein density for studies of protein-lipid interactions using atomic force microscopy (AFM). Initial reconstitutions using a standard dialysis method with bulk L/P ratios ranging from 20:1 to 100:1 (w/w) gave heterogeneous samples that contained both empty vesicles and proteoliposomes with a range of L/P ratios. This is problematic because empty vesicles adsorb and rupture to form bilayer patches more rapidly than do protein-rich vesicles, resulting in the loss of protein during sample washing. Although it was not possible to find reconstitution conditions that gave homogeneous populations of vesicles with high L/P ratios, an additional freeze-thaw cycle immediately after dialysis did reproducibly yield a fraction of proteoliposomes with L/P ratios above 100:1. These proteoliposomes were separated by sucrose gradient centrifugation and used to prepare supported bilayers with well-separated individual receptors and minimal adsorbed proteoliposomes. AFM images of such samples showed many small features protruding from the bilayer surface. These features range in height from 1 to 5nm, consistent with the smaller intracellular domain of the protein exposed, and have lateral dimensions consistent with an individual receptor. Some bilayers with reconstituted protein also had a small fraction of higher features that are assigned to nAChR with the larger extracellular domain exposed and showed evidence for aggregation to give dimers or small oligomers. This work demonstrates the importance of using highly purified reconstituted membranes with uniform lipid-protein ratios for AFM studies of integral membrane protein-lipid interactions." @default.
• W2024587530 created "2016-06-24" @default.
• W2024587530 creator A5026431382 @default.
• W2024587530 creator A5063092943 @default.
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• W2024587530 date "2010-02-01" @default.
• W2024587530 modified "2023-09-23" @default.
• W2024587530 title "Preparation of reconstituted acetylcholine receptor membranes suitable for AFM imaging of lipid–protein interactions" @default.
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• W2024587530 doi "https://doi.org/10.1016/j.chemphyslip.2009.09.003" @default.
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