Functional Equivalence of Monomeric and Dimeric Forms of Purified Acetylcholine Receptors from Torpedo californica in Reconstituted Lipid Vesicles
- 1 August 1980
- journal article
- research article
- Published by Wiley in European Journal of Biochemistry
- Vol. 109 (2), 481-487
- https://doi.org/10.1111/j.1432-1033.1980.tb04819.x
Abstract
Acetylcholine receptors from T. californica electric organ were solubilized and purified under conditions which prevent inactivation of the agonist-regulated cation channels. The dimer form of the receptors was preserved during purification. Treatment with reducing agents converted dimers into monomers. Receptor monomers and dimers were separately reconstituted into soybean lipid vesicles by the cholate dialysis technique. Reconstituted monomers and dimers were functionally equivalent with respect to their carbamylcholine-induced dose-dependent uptake of 22Na+, the total flux of 22Na+ per receptor during the permeability response and the occurrence of desensitization. Evidence against non-covalent association of monomers to produce dimeric functional units was obtained using glutaraldehyde as a cross-linking agent. The acetylcholine-binding sites and the agonist-regulated cation-specific channel apparently are contained within the .alpha.2.beta..gamma..delta. subunit structure of the acetylcholine receptor monomer.This publication has 22 references indexed in Scilit:
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