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- W2085733333 abstract "The interaction of a cholinergic depolarizing agent, bromoacetylcholine, with acetylcholine receptor (AcChR) enriched membrane fragments and Triton-solubilized, purified AcChR from Torpedo californica has been studied. The reagent bound to membrane-bound AcChR reversibly with an apparent dissociation constant of 16 +/- 1 nM at equilibrium. This 600-fold higher affinity for the receptor than found from physiological studies [Kact congruent to 10 micrometers; Karlin, A. (1973) Fed. Proc. Fed. Am. Soc. Exp. Biol. 32, 1847--1853] can be attributed to a ligand-induced affinity change of the membrane-bound receptor upon preincubation with bromoacetylcholine. At equilibrium [3H]bromoacetylcholine, like acetylcholine, bound to half the number of alpha-bungarotoxin sites present in the preparation without apparent positive cooperativity, and this binding was competitively inhibited by acetylcholine. In the presence of dithiothreitol, [3H]bromoacetylcholine irreversibly alkylated both membrane-bound and solubilized, purified acetylcholine receptor, with a stoichiometry identical with that for reversible binding. NaDodSO4-polyacrylamide gel electrophoresis of the labeled acetylcholine receptor showed that only the 40 000-dalton subunit contained the label. From these results it is concluded that the 40 000-dalton subunit represents a major component of the agonist binding site of the receptor." @default.
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- W2085733333 date "1979-05-01" @default.
- W2085733333 modified "2023-09-25" @default.
- W2085733333 title "Studies of reversible and irreversible interactions of an alkylating agonist with Torpedo californica acetylcholine receptor in membrane-bound and purified states" @default.
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- W2085733333 doi "https://doi.org/10.1021/bi00577a003" @default.
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