Structural highlights
FunctionD9IEF7_BPT4 ACM1_HUMAN The muscarinic acetylcholine receptor mediates various cellular responses, including inhibition of adenylate cyclase, breakdown of phosphoinositides and modulation of potassium channels through the action of G proteins. Primary transducing effect is Pi turnover. Publication Abstract from PubMedMuscarinic toxins (MTs) are natural toxins produced by mamba snakes that primarily bind to muscarinic acetylcholine receptors (MAChRs) and modulate their function. Despite their similar primary and tertiary structures, MTs show distinct binding selectivity toward different MAChRs. The molecular details of how MTs distinguish MAChRs are not well understood. Here, we present the crystal structure of M1AChR in complex with MT7, a subtype-selective anti-M1AChR snake venom toxin. The structure reveals the molecular basis of the extreme subtype specificity of MT7 for M1AChR and the mechanism by which it regulates receptor function. Through in vitro engineering of MT7 finger regions that was guided by the structure, we have converted the selectivity from M1AChR toward M2AChR, suggesting that the three-finger fold is a promising scaffold for developing G protein-coupled receptor modulators. Structure and selectivity engineering of the M1 muscarinic receptor toxin complex.,Maeda S, Xu J, N Kadji FM, Clark MJ, Zhao J, Tsutsumi N, Aoki J, Sunahara RK, Inoue A, Garcia KC, Kobilka BK Science. 2020 Jul 10;369(6500):161-167. doi: 10.1126/science.aax2517. PMID:32646996[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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