1bei

Shk-dnp22: A Potent Kv1.3-specific immunosuppressive polypeptide, NMR, 20 structures

spinqualitylabelsall models 1bei Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1bei is a 1 chain structure with sequence from Stichodactyla helianthus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DNP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function K1A_STIHL Inhibits voltage-dependent potassium channels. Inhibits Kv1.3/KCNA3 potently and also blocks Kv1.1/KCNA1, Kv1.4/KCNA4, and Kv1.6/KCNA6 at subnanomolar concentrations. Publication Abstract from PubMed The voltage-gated potassium channel in T lymphocytes, Kv1.3, is an important molecular target for immunosuppressive agents. A structurally defined polypeptide, ShK, from the sea anemone Stichodactyla helianthus inhibited Kv1.3 potently and also blocked Kv1.1, Kv1.4, and Kv1.6 at subnanomolar concentrations. Using mutant cycle analysis in conjunction with complementary mutagenesis of ShK and Kv1.3, and utilizing the structure of ShK, we determined a likely docking configuration for this peptide in the channel. Based upon this topological information, we replaced the critical Lys22 in ShK with the positively charged, non-natural amino acid diaminopropionic acid (ShK-Dap22) and generated a highly selective and potent blocker of the T-lymphocyte channel. ShK-Dap22, at subnanomolar concentrations, suppressed anti-CD3 induced human T-lymphocyte [3H]thymidine incorporation in vitro. Toxicity with this mutant peptide was low in a rodent model, with a median paralytic dose of approximately 200 mg/kg body weight following intravenous administration. The overall structure of ShK-Dap22 in solution, as determined from NMR data, is similar to that of native ShK toxin, but there are some differences in the residues involved in potassium channel binding. Based on these results, we propose that ShK-Dap22 or a structural analogue may have use as an immunosuppressant for the prevention of graft rejection and for the treatment of autoimmune diseases. ShK-Dap22, a potent Kv1.3-specific immunosuppressive polypeptide.,Kalman K, Pennington MW, Lanigan MD, Nguyen A, Rauer H, Mahnir V, Paschetto K, Kem WR, Grissmer S, Gutman GA, Christian EP, Cahalan MD, Norton RS, Chandy KG J Biol Chem. 1998 Dec 4;273(49):32697-707. PMID:9830012 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Potassium channel 3D structures Potassium channel toxin 3D structures

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