1eyo

SOLUTION STRUCTURE OF CONOTOXIN TVIIA FROM CONUS TULIPA

spinqualitylabelsall models 1eyo, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1eyo is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: HYP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [C7A_CONTU] By structural similarity with conotoxin GS, may inhibit the sodium channel (Nav). No effect was observed upon intracranial injections into mice and intraperitoneal injections into goldfish (25 ug). Publication Abstract from PubMed The three-dimensional solution structure of conotoxin TVIIA, a 30-residue polypeptide from the venom of the piscivorous cone snail Conus tulipa, has been determined using 2D 1H NMR spectroscopy. TVIIA contains six cysteine residues which form a 'four-loop' structural framework common to many peptides from Conus venoms including the omega-, delta-, kappa-, and muO-conotoxins. However, TVIIA does not belong to these well-characterized pharmacological classes of conotoxins, but displays high sequence identity with conotoxin GS, a muscle sodium channel blocker from Conus geographus. Structure calculations were based on 562 interproton distance restraints inferred from NOE data, together with 18 backbone and nine side-chain torsion angle restraints derived from spin-spin coupling constants. The final family of 20 structures had mean pairwise rms differences over residues 2-27 of 0.18+/-0.05 A for the backbone atoms and 1.39+/-0.33 A for all heavy atoms. The structure consists of a triple-stranded, antiparallel beta sheet with +2x, -1 topology (residues 7-9, 16-20 and 23-27) and several beta turns. The core of the molecule is formed by three disulfide bonds which form a cystine knot motif common to many toxic and inhibitory polypeptides. The global fold, molecular shape and distribution of amino-acid sidechains in TVIIA is similar to that previously reported for conotoxin GS, and comparison with other four-loop conotoxin structures provides further indication that TVIIA and GS represent a new and distinct subgroup of this structural family. The structure of TVIIA determined in this study provides the basis for determining a structure-activity relationship for these molecules and their interaction with target receptors. Conotoxin TVIIA, a novel peptide from the venom of Conus tulipa 2. Three-dimensional solution structure.,Hill JM, Alewood PF, Craik DJ Eur J Biochem. 2000 Aug;267(15):4649-57. PMID:10903497 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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