2I2R

Crystal structure of the KChIP1/Kv4.3 T1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.35 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional structure of the KChIP1-Kv4.3 T1 complex reveals a cross-shaped octamer

Pioletti, M.Findeisen, F.Hura, G.L.Minor Jr., D.L.

(2006) Nat.Struct.Mol.Biol. 13: 987-995

  • DOI: 10.1038/nsmb1164

  • PubMed Abstract: 
  • Brain I(A) and cardiac I(to) currents arise from complexes containing Kv4 voltage-gated potassium channels and cytoplasmic calcium-sensor proteins (KChIPs). Here, we present X-ray crystallographic and small-angle X-ray scattering data that show that ...

    Brain I(A) and cardiac I(to) currents arise from complexes containing Kv4 voltage-gated potassium channels and cytoplasmic calcium-sensor proteins (KChIPs). Here, we present X-ray crystallographic and small-angle X-ray scattering data that show that the KChIP1-Kv4.3 N-terminal cytoplasmic domain complex is a cross-shaped octamer bearing two principal interaction sites. Site 1 comprises interactions between a unique Kv4 channel N-terminal hydrophobic segment and a hydrophobic pocket formed by displacement of the KChIP H10 helix. Site 2 comprises interactions between a T1 assembly domain loop and the KChIP H2 helix. Functional and biochemical studies indicate that site 1 influences channel trafficking, whereas site 2 affects channel gating, and that calcium binding is intimately linked to KChIP folding and complex formation. Together, the data resolve how Kv4 channels and KChIPs interact and provide a framework for understanding how KChIPs modulate Kv4 function.


    Organizational Affiliation

    Cardiovascular Research Institute, Department of Biochemistry, California Institute for Quantitative Biomedical Research, University of California, San Francisco, California 94143-2532, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium voltage-gated channel subfamily D member 3
A, B, C, D, I, J, K, L
144Rattus norvegicusMutation(s): 0 
Gene Names: Kcnd3
Find proteins for Q62897 (Rattus norvegicus)
Go to UniProtKB:  Q62897
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Kv channel-interacting protein 1
E, F, G, H, M, N, O, P
180Homo sapiensMutation(s): 2 
Gene Names: KCNIP1 (KCHIP1, VABP)
Find proteins for Q9NZI2 (Homo sapiens)
Go to Gene View: KCNIP1
Go to UniProtKB:  Q9NZI2
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B, C, D, I, J, K, L
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download SDF File 
Download CCD File 
E, F, G, H
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
E, F, G, H, M, N, O, P
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.35 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.237 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 93.151α = 91.00
b = 98.105β = 112.56
c = 97.783γ = 111.77
Software Package:
Software NamePurpose
MOSFLMdata reduction
MOLREPphasing
REFMACrefinement
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-10-24
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance