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XB-ART-34774
Mol Pharmacol 2006 Jul 01;701:5-7. doi: 10.1124/mol.106.025767.
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Potentiation of acetylcholine receptors by divalent cations.

Lindstrom J .


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Divalent cations promote activation of several nicotinic acetylcholine receptor (AChR) subtypes, presumably by lowering the energetic barrier between open and closed conformations. In wild-type alpha7 AChRs, binding of calcium to a particular part of the extracellular domain is required for potentiating activation. McLaughlin et al. (p. 16) tested the hypothesis that movements involved in agonist activation and calcium modulation involve a nearby beta sheet by linking strands within this sheet through disulfide bonds formed by replacing adjacent amino acids with cysteines to alter its mobility. These studies are helping to reveal how movements initiated by agonist binding to ACh binding sites are propagated through the extracellular domain of AChRs to regulate opening of the cation channel through the membrane.

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Species referenced: Xenopus laevis
Genes referenced: tbx2

References :
McLaughlin, Role of the outer beta-sheet in divalent cation modulation of alpha7 nicotinic receptors. 2006, Pubmed, Xenbase