1gac

NMR structure of asymmetric homodimer of a82846b, a glycopeptide antibiotic, complexed with its cell wall pentapeptide fragment

spinqualitylabelsall models 1gac Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1gac is a 4 chain structure with sequence from Amycolatopsis orientalis. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Ligands: 3FG, BGC, DAL, FGA, GHP, MLU, OMY, OMZ, PRD_000203, RER Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Proton NMR assignments were determined for the asymmetric dimer complex of A82846B with the pentapeptide cell-wall fragment. A total of 683 experimental constraints, both distance and dihedral, were collected from NOESY and COSY data sets. From these constraints, a total of 80 structures were calculated using standard X-PLOR protocols. These structures were subsequently refined using the full CHARMm potential and the addition of water molecules in the calculation. The CHARMm structures occupied more conformational space than did the X-PLOR structures and were utilized for the structure analysis. From the structures, a unique set of interactions for the dALA-5 carboxylate pocket was observed, having backbone amides from residues 2 and 3 hydrogen bonding one carboxylate oxygen while amide 4 and the side chain amide from Asn-3 hydrogen bond the other oxygen. Also, near the N-terminal region of the ligand, the GGLU-2's carboxylate forms a hydrogen bond with the asymmetric disaccharide dyad, which helps to define the interactions seen for this part of the ligand. Conformation of A82846B, a glycopeptide antibiotic, complexed with its cell wall fragment: an asymmetric homodimer determined using NMR spectroscopy.,Prowse WG, Kline AD, Skelton MA, Loncharich RJ Biochemistry. 1995 Jul 25;34(29):9632-44. PMID:7626632 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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