2ca7

Conkunitzin-S1 Is The First Member Of A New Kunitz-Type Neurotoxin Family- Structural and Functional Characterization

spinqualitylabelsall models 2ca7 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ca7 is a 1 chain structure with sequence from Conus striatus. This structure supersedes the now removed PDB entry 1yl2. 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 VKTS1_CONST Blocks specifically voltage-activated potassium channels (Kv) of the Shaker family (IC(50)=1.33 nM). 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 Conkunitzin-S1 (Conk-S1) is a 60-residue neurotoxin from the venom of the cone snail Conus striatus that interacts with voltage-gated potassium channels. Conk-S1 shares sequence homology with Kunitz-type proteins but contains only two out of the three highly conserved cysteine bridges, which are typically found in these small, basic protein modules. In this study the three-dimensional structure of Conk-S1 has been solved by multidimensional NMR spectroscopy. The solution structure of recombinant Conk-S1 shows that a Kunitz fold is present, even though one of the highly conserved disulfide cross-links is missing. Introduction of a third, homologous disulfide bond into Conk-S1 results in a functional toxin with similar affinity for Shaker potassium channels. The affinity of Conk-S1 can be enhanced by a pore mutation within the Shaker channel pore indicating an interaction of Conk-S1 with the vestibule of potassium channels. Conkunitzin-S1 is the first member of a new Kunitz-type neurotoxin family. Structural and functional characterization.,Bayrhuber M, Vijayan V, Ferber M, Graf R, Korukottu J, Imperial J, Garrett JE, Olivera BM, Terlau H, Zweckstetter M, Becker S J Biol Chem. 2005 Jun 24;280(25):23766-70. Epub 2005 Apr 15. PMID:15833744 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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