Crystal Structure of Kv Channel-interacting protein 1 (KChIP-1)

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.250 

wwPDB Validation   3D Report Full Report

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Two N-terminal domains of Kv4 K(+) channels regulate binding to and modulation by KChIP1.

Scannevin, R.H.Wang, K.-W.Jow, F.Megules, J.Kopsco, D.C.Edris, W.Carroll, K.C.Xu, W.-X.Xu, Z.-B.Katz, A.H.Olland, S.Lin, L.Taylor, M.Stahl, M.Malakian, K.Somers, W.Mosyak, L.Bowlby, M.R.Chanda, P.Rhodes, K.J.

(2004) Neuron 41: 587-598

  • DOI: https://doi.org/10.1016/s0896-6273(04)00049-2
  • Primary Citation of Related Structures:  
    1S1E, 1S1G

  • PubMed Abstract: 

    The family of calcium binding proteins called KChIPs associates with Kv4 family K(+) channels and modulates their biophysical properties. Here, using mutagenesis and X-ray crystallography, we explore the interaction between Kv4 subunits and KChIP1. Two regions in the Kv4.2 N terminus, residues 7-11 and 71-90, are necessary for KChIP1 modulation and interaction with Kv4.2. When inserted into the Kv1.2 N terminus, residues 71-90 of Kv4.2 are also sufficient to confer association with KChIP1. To provide a structural framework for these data, we solved the crystal structures of Kv4.3N and KChIP1 individually. Taken together with the mutagenesis data, the individual structures suggest that that the Kv4 N terminus is required for stable association with KChIP1, perhaps through a hydrophobic surface interaction, and that residues 71-90 in Kv4 subunits form a contact loop that mediates the specific association of KChIPs with Kv4 subunits.

  • Organizational Affiliation

    Neuroscience Discovery Research, Wyeth Research CN-8000, Princeton, NJ 08543, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kv channel interacting protein 1224Homo sapiensMutation(s): 0 
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Find proteins for Q9NZI2 (Homo sapiens)
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Go to UniProtKB:  Q9NZI2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NZI2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.250 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.133α = 90
b = 50.133β = 90
c = 177.329γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2005-01-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description