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: 3.20 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.265 

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
  • Primary Citation of Related Structures:  
    2NZ0

  • 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 co-crystal structure of the complex of human Kv4 ...

    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: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Kv channel-interacting protein 1A, C180Homo sapiensMutation(s): 0 
Gene Names: KCHIP1, KCNIP1, VABP
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NZI2 (Homo sapiens)
Explore Q9NZI2 
Go to UniProtKB:  Q9NZI2
PHAROS:  Q9NZI2
GTEx:  ENSG00000182132 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NZI2
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily D member 3B, D140Homo sapiensMutation(s): 0 
Gene Names: Kv4.3, KCND3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UK17 (Homo sapiens)
Explore Q9UK17 
Go to UniProtKB:  Q9UK17
PHAROS:  Q9UK17
GTEx:  ENSG00000171385 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UK17
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.265 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.186α = 90
b = 112.213β = 90
c = 141.051γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
AMoREphasing

Structure Validation

View Full Validation Report



View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

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