4KL1

HCN4 CNBD in complex with cGMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cyclic dinucleotides bind the C-linker of HCN4 to control channel cAMP responsiveness.

Lolicato, M.Bucchi, A.Arrigoni, C.Zucca, S.Nardini, M.Schroeder, I.Simmons, K.Aquila, M.DiFrancesco, D.Bolognesi, M.Schwede, F.Kashin, D.Fishwick, C.W.Johnson, A.P.Thiel, G.Moroni, A.

(2014) Nat Chem Biol 10: 457-462

  • DOI: 10.1038/nchembio.1521
  • Primary Citation of Related Structures:  
    4KL1

  • PubMed Abstract: 
  • cAMP mediates autonomic regulation of heart rate by means of hyperpolarization-activated cyclic nucleotide-gated (HCN) channels, which underlie the pacemaker current If. cAMP binding to the C-terminal cyclic nucleotide binding domain enhances HCN open probability through a conformational change that reaches the pore via the C-linker ...

    cAMP mediates autonomic regulation of heart rate by means of hyperpolarization-activated cyclic nucleotide-gated (HCN) channels, which underlie the pacemaker current If. cAMP binding to the C-terminal cyclic nucleotide binding domain enhances HCN open probability through a conformational change that reaches the pore via the C-linker. Using structural and functional analysis, we identified a binding pocket in the C-linker of HCN4. Cyclic dinucleotides, an emerging class of second messengers in mammals, bind the C-linker pocket (CLP) and antagonize cAMP regulation of the channel. Accordingly, cyclic dinucleotides prevent cAMP regulation of If in sinoatrial node myocytes, reducing heart rate by 30%. Occupancy of the CLP hence constitutes an efficient mechanism to hinder β-adrenergic stimulation on If. Our results highlight the regulative role of the C-linker and identify a potential drug target in HCN4. Furthermore, these data extend the signaling scope of cyclic dinucleotides in mammals beyond their first reported role in innate immune system.


    Organizational Affiliation

    1] Department of Biosciences, University of Milan, Milan, Italy. [2] Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Milan, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4 ABCD199Homo sapiensMutation(s): 0 
Gene Names: HCN4
Find proteins for Q9Y3Q4 (Homo sapiens)
Explore Q9Y3Q4 
Go to UniProtKB:  Q9Y3Q4
NIH Common Fund Data Resources
PHAROS:  Q9Y3Q4
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.214 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.1α = 90
b = 99.03β = 90
c = 109.57γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
PHASESphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-30
    Type: Initial release
  • Version 1.1: 2014-06-11
    Changes: Database references