4L11

Structure of the C-linker/CNBHD of agERG channels


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the C-terminal region of an ERG channel and functional implications.

Brelidze, T.I.Gianulis, E.C.Dimaio, F.Trudeau, M.C.Zagotta, W.N.

(2013) Proc.Natl.Acad.Sci.USA 110: 11648-11653

  • DOI: 10.1073/pnas.1306887110

  • PubMed Abstract: 
  • The human ether-à-go-go-related gene (hERG) encodes a K(+) channel crucial for repolarization of the cardiac action potential. EAG-related gene (ERG) channels contain a C-terminal cyclic nucleotide-binding homology domain coupled to the pore of the c ...

    The human ether-à-go-go-related gene (hERG) encodes a K(+) channel crucial for repolarization of the cardiac action potential. EAG-related gene (ERG) channels contain a C-terminal cyclic nucleotide-binding homology domain coupled to the pore of the channel by a C-linker. Here, we report the structure of the C-linker/cyclic nucleotide-binding homology domain of a mosquito ERG channel at 2.5-Å resolution. The structure reveals that the region expected to form the cyclic nucleotide-binding pocket is negatively charged and is occupied by a short β-strand, referred to as the intrinsic ligand, explaining the lack of direct regulation of ERG channels by cyclic nucleotides. In hERG channels, the intrinsic ligand harbors hereditary mutations associated with long-QT syndrome (LQTS), a potentially lethal cardiac arrhythmia. Mutations in the intrinsic ligand affected hERG channel gating and LQTS mutations abolished hERG currents and altered trafficking of hERG channels, which explains the LQT phenotype. The structure also reveals a dramatically different conformation of the C-linker compared with the structures of the related ether-à-go-go-like K(+) and hyperpolarization-activated cyclic nucleotide-modulated channels, suggesting that the C-linker region may be highly dynamic in the KCNH, hyperpolarization-activated cyclic nucleotide-modulated, and cyclic nucleotide-gated channels.


    Organizational Affiliation

    Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, WA 98195, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AGAP007709-PA
A
204Anopheles gambiaeMutation(s): 0 
Gene Names: 1269513
Find proteins for Q7QJX3 (Anopheles gambiae)
Go to UniProtKB:  Q7QJX3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 51.400α = 90.00
b = 51.400β = 90.00
c = 162.031γ = 120.00
Software Package:
Software NamePurpose
SCALAdata scaling
BOSdata collection
PHASERphasing
MOSFLMdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-06-01 
  • Released Date: 2013-06-26 
  • Deposition Author(s): Brelidze, T.I.

Revision History 

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-07-24
    Type: Database references