1yi5 | pdb_00001yi5

Crystal structure of the a-cobratoxin-AChBP complex

spinqualitylabelsall models 1yi5, resolution 4.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1yi5 is a 10 chain structure with sequence from Lymnaea stagnalis and Naja siamensis. The November 2005 RCSB PDB Molecule of the Month feature on Acetylcholine Receptor by David S. Goodsell is 10.2210/rcsb_pdb/mom_2005_11. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1i9b, 1uv6, 1ux2, 1uw6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ACHP_LYMST] Binds to acetylcholine. Modulates neuronal synaptic transmission. [NXL1_NAJKA] The monomeric form binds with high affinity to muscular, Torpedo (muscle-type), and neuronal alpha-7 nicotinic acetylcholine receptors (nAChR). Has no effect on alpha-3/beta-2 nAChR. Causes paralysis by preventing acetylcholine binding to the nAChR. Does not show any blockade of the nicotine-evoked release of dopamine and does not affect ACh release. In mice lung cancer, causes reduction of tumor growth. The homodimeric form binds with low affinity to Torpedo (muscle-type) and alpha-7 nAChRs, whereas it acquires the capacity to block alpha-3/beta-2 nAChRs. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The crystal structure of the snake long alpha-neurotoxin, alpha-cobratoxin, bound to the pentameric acetylcholine-binding protein (AChBP) from Lymnaea stagnalis, was solved from good quality density maps despite a 4.2 A overall resolution. The structure unambiguously reveals the positions and orientations of all five three-fingered toxin molecules inserted at the AChBP subunit interfaces and the conformational changes associated with toxin binding. AChBP loops C and F that border the ligand-binding pocket move markedly from their original positions to wrap around the tips of the toxin first and second fingers and part of its C-terminus, while rearrangements also occur in the toxin fingers. At the interface of the complex, major interactions involve aromatic and aliphatic side chains within the AChBP binding pocket and, at the buried tip of the toxin second finger, conserved Phe and Arg residues that partially mimic a bound agonist molecule. Hence this structure, in revealing a distinctive and unpredicted conformation of the toxin-bound AChBP molecule, provides a lead template resembling a resting state conformation of the nicotinic receptor and for understanding selectivity of curaremimetic alpha-neurotoxins for the various receptor species. Crystal structure of a Cbtx-AChBP complex reveals essential interactions between snake alpha-neurotoxins and nicotinic receptors.,Bourne Y, Talley TT, Hansen SB, Taylor P, Marchot P EMBO J. 2005 Apr 20;24(8):1512-22. Epub 2005 Mar 24. PMID:15791209 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Acetylcholine Receptor and its Reaction to Cobra Venom Acetylcholine binding protein 3D structures

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