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• W2062858457 startingPage "35" @default.
• W2062858457 abstract "The 'functional' state of the acetylcholine receptor protein has been followed during reconstitution with the fluorescent agonist [1-(5-dimethylaminonaphthalene)-sulfonamidol]-n-hexanoic acid-beta-N-trimetylammonium bromide ethyl ester (Dns-C6-Cho) and rapid-mixing techniques. Under appropriate conditions, a majority of the acetylcholine receptor sites can be recovered in a low-affinity state(s) for Dns-C6-Cho, similar to that found with the native membrane-bound receptor. This state can be slowly interconverted to a high-affinity state after rapid mixing with the agonist, and the non-competitive channel blockers, like the local anesthetics, still regulate this transition in an allosteric manner. Several experimental conditions commonly used for the solubilization of the receptor and for its purification in the presence of sodium cholate result in the failure of reconstitution: the soluble receptor protein is stabilized in a low-affinity state which can no longer be interconverted to a high-affinity state in the presence of agonists or local anesthetics. On the other hand, it is demonstrated that if the concentration of lipids remains elevated in the presence of sodium cholate, a soluble (9-S) low-affinity form of the receptor protein can be obtained which shows most of the characteristic properties of the membrane-bound receptor and in particular the slow interconversion to the high-affinity state and the effect of local anesthetics on this transition; furthermore, in these conditions the soluble protein can be manipulated ad libitum and submitted, for instance, to column filtrations and sucrose gradient centrifugations in the presence of detergent, without losing its characteristic conformational and allosteric transitions. After elimination of the detergent this form yields a reconstituted receptor which presents binding properties identical to those of the native membrane-bound receptor and leads to the formation of vesicles which exhibit carbamylcholine-sensitive ion fluxes. A necessary and sufficient condition for functional reconstitution is therefore the conservation, in the presence of lipids, of the allosteric properties of the receptor protein in its detergent-soluble form." @default.
• W2062858457 created "2016-06-24" @default.
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• W2062858457 creator A5056074308 @default.
• W2062858457 date "1980-09-01" @default.
• W2062858457 modified "2023-09-25" @default.
• W2062858457 title "Reconstitution of a Functional Acetylcholine Receptor. Conservation of the Conformational and Allosteric Transitions and Recovery of the Permeability Response; Role of Lipids" @default.
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• W2062858457 doi "https://doi.org/10.1111/j.1432-1033.1980.tb04839.x" @default.
• W2062858457 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7439162" @default.
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