4HQA

Crystal structure of PAS domain from the human ERG (hERG) potassium channel


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.201 

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:  4HOI, 4HP4, 4HP9

  • 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 queue ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium voltage-gated channel subfamily H member 2
A
137Homo sapiensGene Names: KCNH2 (ERG, ERG1, HERG)
Find proteins for Q12809 (Homo sapiens)
Go to Gene View: KCNH2
Go to UniProtKB:  Q12809
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.201 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 56.750α = 90.00
b = 56.750β = 90.00
c = 134.850γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
PDB_EXTRACTdata extraction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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