1rgj

NMR STRUCTURE OF THE COMPLEX BETWEEN ALPHA-BUNGAROTOXIN AND MIMOTOPE OF THE NICOTINIC ACETYLCHOLINE RECEPTOR WITH ENHANCED ACTIVITYNMR STRUCTURE OF THE COMPLEX BETWEEN ALPHA-BUNGAROTOXIN AND MIMOTOPE OF THE NICOTINIC ACETYLCHOLINE RECEPTOR WITH ENHANCED ACTIVITY

Structural highlights 1rgj is a 2 chain structure with sequence from Bungarus multicinctus. This structure supersedes the now removed PDB entry 1p67. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1jbd, 1hoy, 1ik8, 1ikc Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [NXL1A_BUNMU] Binds with high affinity to muscular and neuronal (alpha-7, alpha-8, and alpha-9) nicotinic acetylcholine receptors. Produces peripheral paralysis by blocking neuromuscular transmission at the postsynaptic site. Blocks the extracellular increase of dopamine evoked by nicotine only at the higher dose (4.2 uM). 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 interaction between alpha-bungarotoxin and linear synthetic peptides, mimotope of the nicotinic acetylcholine receptor binding site, has been characterised extensively by several methods and a wealth of functional, kinetic and structural data are available. Hence, this system represents a suitable model to explore in detail the dynamics of a peptide-protein interaction. Here, the solution structure of a new complex of the protein toxin with a tridecapeptide ligand exhibiting high affinity has been determined by NMR. As observed for three other previously reported mimotope-alpha-bungarotoxin complexes, also in this case correlations between biological activity and kinetic data are not fully consistent with a static discussion of structural data. Molecular dynamics simulations of the four mimotope-toxin complexes indicate that a relevant contribution to the complex stability is given by the extent of the residual flexibility that the protein maintains upon peptide binding. This feature, limiting the entropy loss caused by protein folding and binding, ought to be generally considered in a rational design of specific protein ligands. NMR and MD studies on the interaction between ligand peptides and alpha-bungarotoxin.,Bernini A, Ciutti A, Spiga O, Scarselli M, Klein S, Vannetti S, Bracci L, Lozzi L, Lelli B, Falciani C, Neri P, Niccolai N J Mol Biol. 2004 Jun 18;339(5):1169-77. PMID:15178256 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Bungarotoxin 3D structures

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