1BEI

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


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST STEREOCHEMICAL ENERGY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

ShK-Dap22, a potent Kv1.3-specific immunosuppressive polypeptide.

Kalman, K.Pennington, M.W.Lanigan, M.D.Nguyen, A.Rauer, H.Mahnir, V.Paschetto, K.Kem, W.R.Grissmer, S.Gutman, G.A.Christian, E.P.Cahalan, M.D.Norton, R.S.Chandy, K.G.

(1998) J.Biol.Chem. 273: 32697-32707


  • PubMed Abstract: 
  • 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 block ...

    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.


    Organizational Affiliation

    Departments of Physiology & Biophysics, and Microbiology and Molecular Genetics, University of California, Irvine, California 92697-4560, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
POTASSIUM CHANNEL TOXIN SHK
A
35Stichodactyla helianthusN/A
Find proteins for P29187 (Stichodactyla helianthus)
Go to UniProtKB:  P29187
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
DNP
Query on DNP
A
L-PEPTIDE LINKINGC3 H9 N2 O2ALA
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST STEREOCHEMICAL ENERGY 
  • Olderado: 1BEI Olderado
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-12-02
    Type: Initial release
  • Version 1.1: 2008-03-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance