Crystal structure of PAS domain from the mouse EAG1 potassium channel

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 

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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: https://doi.org/10.1371/journal.pone.0059265
  • Primary Citation of Related Structures:  
    4HOI, 4HP4, 4HP9, 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. 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.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily H member 1
A, B, C, D
114Mus musculusMutation(s): 0 
Gene Names: EagKcnh1
Find proteins for Q60603 (Mus musculus)
Explore Q60603 
Go to UniProtKB:  Q60603
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ60603
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • 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
PDB_EXTRACTdata extraction

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
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description