2NZ0

Crystal structure of potassium channel Kv4.3 in complex with its regulatory subunit KChIP1 (CASP Target)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.261 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for modulation of Kv4 K(+) channels by auxiliary KChIP subunits.

Wang, H.Yan, Y.Liu, Q.Huang, Y.Shen, Y.Chen, L.Chen, Y.Yang, Q.Hao, Q.Wang, K.Chai, J.

(2007) Nat.Neurosci. 10: 32-39

  • DOI: 10.1038/nn1822

  • PubMed Abstract: 
  • KChIPs coassemble with pore-forming Kv4 alpha subunits to form a native complex in the brain and heart and regulate the expression and gating properties of Kv4 K(+) channels, but the mechanisms underlying these processes are unknown. Here we report a ...

    KChIPs coassemble with pore-forming Kv4 alpha subunits to form a native complex in the brain and heart and regulate the expression and gating properties of Kv4 K(+) channels, but the mechanisms underlying these processes are unknown. Here we report a co-crystal structure of the complex of human Kv4.3 N-terminus and KChIP1 at a 3.2-A resolution. The structure reveals a unique clamping action of the complex, in which a single KChIP1 molecule, as a monomer, laterally clamps two neighboring Kv4.3 N-termini in a 4:4 manner, forming an octamer. The proximal N-terminal peptide of Kv4.3 is sequestered by its binding to an elongated groove on the surface of KChIP1, which is indispensable for the modulation of Kv4.3 by KChIP1, and the same KChIP1 molecule binds to an adjacent T1 domain to stabilize the tetrameric Kv4.3 channels. Taken together with biochemical and functional data, our findings provide a structural basis for the modulation of Kv4 by KChIPs.


    Organizational Affiliation

    National Institute of Biological Sciences, No. 7 Science Park Road, Beijing 102206, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kv channel-interacting protein 1
A, C
180Homo sapiensMutation(s): 0 
Gene Names: KCNIP1 (KCHIP1, VABP)
Find proteins for Q9NZI2 (Homo sapiens)
Go to Gene View: KCNIP1
Go to UniProtKB:  Q9NZI2
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Potassium voltage-gated channel subfamily D member 3
B, D
140Homo sapiensMutation(s): 0 
Gene Names: KCND3
Find proteins for Q9UK17 (Homo sapiens)
Go to Gene View: KCND3
Go to UniProtKB:  Q9UK17
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
B, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.261 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 112.186α = 90.00
b = 112.213β = 90.00
c = 141.051γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
AMoREphasing
HKL-2000data collection
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-12-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance