2A9H

NMR structural studies of a potassium channel / charybdotoxin complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Nuclear magnetic resonance structural studies of a potassium channel-charybdotoxin complex.

Yu, L.Sun, C.Song, D.Shen, J.Xu, N.Gunasekera, A.Hajduk, P.J.Olejniczak, E.T.

(2005) Biochemistry 44: 15834-15841

  • DOI: 10.1021/bi051656d

  • PubMed Abstract: 
  • Ion channels play critical roles in signaling processes and are attractive targets for treating various diseases. Here we describe an NMR-based strategy for structural analyses of potassium channel-ligand complexes using KcsA (residues 1-132, with si ...

    Ion channels play critical roles in signaling processes and are attractive targets for treating various diseases. Here we describe an NMR-based strategy for structural analyses of potassium channel-ligand complexes using KcsA (residues 1-132, with six mutations to impart toxin binding and to mimic the eukaryotic hERG channel). Using this approach, we determined the solution structure of KcsA in complex with the high-affinity peptide antagonist charybdotoxin. The structural data reveal how charybdotoxin binds to the closed form of KcsA and makes specific contacts with the extracellular surface of the ion channel, resulting in pore blockage. This represents the first direct structural information about an ion channel complexed to a peptide antagonist and provides an experimental framework for understanding and interpreting earlier mutational analyses. The strategy presented here overcomes many of the limitations of conventional NMR approaches to helical membrane protein structure determination and can be applied in the study of the binding of druglike molecules to this important class of proteins.


    Organizational Affiliation

    Pharmaceutical Discovery Division, GPRD, Abbott Laboratories, Abbott Park, Illinois 60064-6098, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Voltage-gated potassium channel
A, B, C, D
155Streptomyces lividansMutation(s): 7 
Gene Names: kcsA (skc1)
Find proteins for P0A334 (Streptomyces lividans)
Go to UniProtKB:  P0A334
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
charybdotoxin
E
37Leiurus quinquestriatus hebraeusMutation(s): 0 
Find proteins for P13487 (Leiurus quinquestriatus hebraeus)
Go to UniProtKB:  P13487
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
E
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-01-10
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance