1Q3E

HCN2J 443-645 in the presence of cGMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.210 

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This is version 1.2 of the entry. See complete history


Literature

Structural basis for modulation and agonist specificity of HCN pacemaker channels

Zagotta, W.N.Olivier, N.B.Black, K.D.Young, E.C.Olson, R.Gouaux, J.E.

(2003) Nature 425: 200-205

  • DOI: 10.1038/nature01922
  • Primary Citation of Related Structures:  
    1Q3E, 1Q43, 1Q5O

  • PubMed Abstract: 
  • The family of hyperpolarization-activated, cyclic nucleotide-modulated (HCN) channels are crucial for a range of electrical signalling, including cardiac and neuronal pacemaker activity, setting resting membrane electrical properties and dendritic integration ...

    The family of hyperpolarization-activated, cyclic nucleotide-modulated (HCN) channels are crucial for a range of electrical signalling, including cardiac and neuronal pacemaker activity, setting resting membrane electrical properties and dendritic integration. These nonselective cation channels, underlying the I(f), I(h) and I(q) currents of heart and nerve cells, are activated by membrane hyperpolarization and modulated by the binding of cyclic nucleotides such as cAMP and cGMP. The cAMP-mediated enhancement of channel activity is largely responsible for the increase in heart rate caused by beta-adrenergic agonists. Here we have investigated the mechanism underlying this modulation by studying a carboxy-terminal fragment of HCN2 containing the cyclic nucleotide-binding domain (CNBD) and the C-linker region that connects the CNBD to the pore. X-ray crystallographic structures of this C-terminal fragment bound to cAMP or cGMP, together with equilibrium sedimentation analysis, identify a tetramerization domain and the mechanism for cyclic nucleotide specificity, and suggest a model for ligand-dependent channel modulation. On the basis of amino acid sequence similarity to HCN channels, the cyclic nucleotide-gated, and eag- and KAT1-related families of channels are probably related to HCN channels in structure and mechanism.


    Organizational Affiliation

    Department of Physiology and Biophysics, Howard Hughes Medical Institute, Box 357290, University of Washington School of Medicine, Seattle, Washington 98195-7290, USA. zagotta@u.washington.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 2A, B207Mus musculusMutation(s): 0 
Gene Names: HCN2 OR BCNG2 OR HAC1Hcn2Bcng2Hac1
UniProt
Find proteins for O88703 (Mus musculus)
Explore O88703 
Go to UniProtKB:  O88703
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO88703
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PCG
Query on PCG

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
CYCLIC GUANOSINE MONOPHOSPHATE
C10 H12 N5 O7 P
ZOOGRGPOEVQQDX-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.210 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.236α = 90
b = 94.236β = 90
c = 124.008γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-09-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance