Abstract
One of the most actively studied chemoreceptors is the acetylcholine receptor (AChR) in the postsynaptic membranes of neuromuscular junctions and electrocytes. The AChR from Torpedo is a membrane protein, each molecule comprising five polypeptide chains1,2: two α-chains of molecular weight (Mr) 40,000, and three homologous chains of Mr 50,000 (β), 60,000 (γ) and 65,000 (δ). Only the α-summits seem to carry the specific recognition sites for agonists and antagonists2. As snake α-neurotoxins seem to bind highly specifically and quasi-irreversibly to these sites we performed a structural analysis to localize the α-subunits, using as marker native α-bungarotoxin (α-BTX, Mr 8,000; ref. 3). We report here the results obtained at 20 Å resolution by electron microscopy and single-particle image averaging4, which reveal two well-defined regions within the AChR structure5,6 where the mass increases significantly on binding of α-BTX. One of these (α1) is adjacent to the region where the δ-subunit has been located6; the second region (α2) is diametrically across the molecule, ∼50 Å away from the δ-subunit and also from (α1). The topography revealed by direct structural analysis can explain the results of previous nearest-neighbour cross-linking studies2,7.
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Zingsheim, H., Barrantes, F., Frank, J. et al. Direct structural localization of two toxin-recognition sites on an ACh receptor protein. Nature 299, 81–84 (1982). https://doi.org/10.1038/299081a0
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DOI: https://doi.org/10.1038/299081a0
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