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Structure of the eag domain-CNBHD complex of the mouse EAG1 channel


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.995 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structural mechanism of KCNH-channel regulation by the eag domain.

Haitin, Y.Carlson, A.E.Zagotta, W.N.

(2013) Nature 501: 444-448

  • DOI: 10.1038/nature12487

  • PubMed Abstract: 
  • The KCNH voltage-dependent potassium channels (ether-à-go-go, EAG; EAG-related gene, ERG; EAG-like channels, ELK) are important regulators of cellular excitability and have key roles in diseases such as cardiac long QT syndrome type 2 (LQT2), epileps ...

    The KCNH voltage-dependent potassium channels (ether-à-go-go, EAG; EAG-related gene, ERG; EAG-like channels, ELK) are important regulators of cellular excitability and have key roles in diseases such as cardiac long QT syndrome type 2 (LQT2), epilepsy, schizophrenia and cancer. The intracellular domains of KCNH channels are structurally distinct from other voltage-gated channels. The amino-terminal region contains an eag domain, which is composed of a Per-Arnt-Sim (PAS) domain and a PAS-cap domain, whereas the carboxy-terminal region contains a cyclic nucleotide-binding homology domain (CNBHD), which is connected to the pore through a C-linker domain. Many disease-causing mutations localize to these specialized intracellular domains, which underlie the unique gating and regulation of KCNH channels. It has been suggested that the eag domain may regulate the channel by interacting with either the S4-S5 linker or the CNBHD. Here we present a 2 Å resolution crystal structure of the eag domain-CNBHD complex of the mouse EAG1 (also known as KCNH1) channel. It displays extensive interactions between the eag domain and the CNBHD, indicating that the regulatory mechanism of the eag domain primarily involves the CNBHD. Notably, the structure reveals that a number of LQT2 mutations at homologous positions in human ERG, in addition to cancer-associated mutations in EAG channels, localize to the eag domain-CNBHD interface. Furthermore, mutations at the interface produced marked effects on channel gating, demonstrating the important physiological role of the eag domain-CNBHD interaction. Our structure of the eag domain-CNBHD complex of mouse EAG1 provides unique insights into the physiological and pathophysiological mechanisms of KCNH channels.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium voltage-gated channel subfamily H member 1
A, C, E, G
177Mus musculusMutation(s): 0 
Gene Names: Kcnh1 (Eag)
Find proteins for Q60603 (Mus musculus)
Go to UniProtKB:  Q60603
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Potassium voltage-gated channel subfamily H member 1
B, D, F, H
134Mus musculusMutation(s): 0 
Gene Names: Kcnh1 (Eag)
Find proteins for Q60603 (Mus musculus)
Go to UniProtKB:  Q60603
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.995 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.167 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 162.380α = 90.00
b = 162.380β = 90.00
c = 100.440γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
PHASERphasing
BOSdata collection
SCALAdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-08-28
    Type: Initial release
  • Version 1.1: 2013-09-25
    Type: Database references