1bf0

CALCICLUDINE (CAC) FROM GREEN MAMBA DENDROASPIS ANGUSTICEPS, NMR, 15 STRUCTURES

spinqualitylabelsall models 1bf0, 15 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1bf0 is a 1 chain structure with sequence from Dendroaspis angusticeps. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, RCSB, PDBsum Function [TXCA_DENAN] Potent blocker of high-voltage-activated calcium ion channels in the nanomolar range, particularly the L-type channels in cerebellar granule cells. The sensitivity of L-, N- and P-type channels to CAC is tissue and species-dependent. Blocks the L-type current of cardiac cells, depressing cardiac contractility. 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 Calcicludine, a 60-amino acid protein isolated from the green mamba venom, has been recently identified as blocking a large set (i.e., L-, N- and P-type) of Ca2+ channels. The three-dimensional structure of calcicludine has been determined by NMR and molecular modeling using a data set of 723 unambiguous and 265 ambiguous distance restraints, as 33 phi and 13 chi1 dihedral angle restraints. Analysis of the 15 final structures (backbone root-mean-square deviation = 0.6 A) shows that calcicludine adopts the Kunitz-type protease inhibitor fold. Its three-dimensional structure is similar to that of snake K+ channel blockers dendrotoxins. Conformational differences with protease inhibitors and dendrotoxins are localized in the 3(10) helix and loop 1 (segments 1-7 and 10-19), the extremity of the beta-hairpin (segment 27-30), and loop 2 (segment 39-44). These regions correspond to the functional sites of bovine pancreatic trypsin inhibitor (BPTI) and dendrotoxins. The positioning of the N-terminal segment 1-7 relative to the rest of the protein is characteristic of calcicludine. The involvement of this segment and the positively charged K31 at the tip of the beta-hairpin in the biological activity of calcicludine is discussed. Conformational and functional variability supported by the BPTI fold: solution structure of the Ca2+ channel blocker calcicludine.,Gilquin B, Lecoq A, Desne F, Guenneugues M, Zinn-Justin S, Menez A Proteins. 1999 Mar 1;34(4):520-32. PMID:10081964 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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