4HOI

Crystal structure of PAS domain from the mouse EAG1 potassium channel


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural properties of PAS domains from the KCNH potassium channels

Adaixo, R.Harley, C.A.Castro-Rodrigues, A.F.Morais-Cabral, J.H.

(2013) PLoS One 8: e59265-e59265

  • DOI: 10.1371/journal.pone.0059265
  • Primary Citation of Related Structures:  
    4HP4, 4HP9, 4HOI, 4HQA

  • PubMed Abstract: 
  • KCNH channels form an important family of voltage gated potassium channels. These channels include a N-terminal Per-Arnt-Sim (PAS) domain with unknown function. In other proteins PAS domains are implicated in cellular responses to environmental queues through small molecule binding or involvement in signaling cascades ...

    KCNH channels form an important family of voltage gated potassium channels. These channels include a N-terminal Per-Arnt-Sim (PAS) domain with unknown function. In other proteins PAS domains are implicated in cellular responses to environmental queues through small molecule binding or involvement in signaling cascades. To better understand their role we characterized the structural properties of several channel PAS domains. We determined high resolution structures of PAS domains from the mouse EAG (mEAG), drosophila ELK (dELK) and human ERG (hERG) channels and also of the hERG domain without the first nine amino acids. We analyzed these structures for features connected to ligand binding and signaling in other PAS domains. In particular, we have found cavities in the hERG and mEAG structures that share similarities with the ligand binding sites from other PAS domains. These cavities are lined by polar and apolar chemical groups and display potential flexibility in their volume. We have also found that the hydrophobic patch on the domain β-sheet is a conserved feature and appears to drive the formation of protein-protein contacts. In addition, the structures of the dELK domain and of the truncated hERG domain revealed the presence of N-terminal helices. These helices are equivalent to the helix described in the hERG NMR structures and are known to be important for channel function. Overall, these channel domains retain many of the PAS domain characteristics known to be important for cell signaling.


    Related Citations: 
    • Crystallization and preliminary crystallographic characterization of the PAS domains of EAG and ELK potassium channels
      Adaixo, R., Morais-Cabral, J.H.
      (2010) Acta Crystallogr Sect F Struct Biol Cryst Commun F66: 1056

    Organizational Affiliation

    IBMC, Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily H member 1A, B, C, D114Mus musculusMutation(s): 0 
Gene Names: EagKcnh1
UniProt
Find proteins for Q60603 (Mus musculus)
Explore Q60603 
Go to UniProtKB:  Q60603
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.276α = 90
b = 91.276β = 90
c = 172.521γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references