1tos

TORPEDO CALIFORNICA ACHR RECEPTOR [ALA76] ANALOGUE COMPLEXED WITH THE ANTI-ACETYLCHOLINE MAB6 MONOCLONAL ANTIBODY

spinqualitylabelsall models 1tos Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1tos is a 1 chain structure with sequence from Tetronarce californica. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ACHA_TETCF After binding acetylcholine, the AChR responds by an extensive change in conformation that affects all subunits and leads to opening of an ion-conducting channel across the plasma membrane. Publication Abstract from PubMed Monoclonal antibodies against the main immunogenic region (MIR) of the muscle acetylcholine receptor (AChR) are capable of inducing experimental myasthenia gravis (MG) in animals. The epitope of these antibodies has been localized between residues 67 and 76 of the AChR alpha-subunit. The conformation in solution of the Torpedo californica MIR peptide and of its [A76] MIR analogue have been analyzed using molecular modeling based on nmr interproton distances and J-derived phi dihedral angles. Molecular dynamics simulations including dimethyl-sulfoxide as explicit solvent have been carried out on the free MIR peptide. Calculation of the structure of the [A76]MIR analogue bound to an anti-MIR monoclonal antibody have been performed in the presence of water molecules. A tightly folded structure appears for both peptides with alpha beta-folded N-terminal N68-P-A-D71 sequence of type I in the free state and type III in the mAb6-bound state. The C-terminal sequence is folded in two different ways according to the result in the free and bound state of the peptides: two overlapping beta/beta or beta/alpha turns result in a short helical sequence in the free MIR peptide, whereas the bound analogue is folded by uncommon hydrogen bond closing an 11-membered cycle. This structural evolution is essentially the result of the reorientation of the hydrophobic side chains that are probably directly involved in peptide--antibody recognition. Compared structures of the free nicotinic acetylcholine receptor main immunogenic region (MIR) decapeptide and the antibody-bound [A76]MIR analogue: a molecular dynamics simulation from two-dimensional NMR data.,Orlewski P, Marraud M, Cung MT, Tsikaris V, Sakarellos-Daitsiotis M, Sakarellos C, Vatzaki E, Tzartos SJ Biopolymers. 1996;40(5):419-32. PMID:9062066 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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