4NVP

Structure of the cyclic nucleotide-binding domain of HCN4 channel complexed with 7-CH-cAMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Cyclic Nucleotide Mapping of Hyperpolarization-Activated Cyclic Nucleotide-Gated (HCN) Channels.

Moller, S.Alfieri, A.Bertinetti, D.Aquila, M.Schwede, F.Lolicato, M.Rehmann, H.Moroni, A.Herberg, F.W.

(2014) Acs Chem.Biol. 9: 1128-1137

  • DOI: 10.1021/cb400904s

  • PubMed Abstract: 
  • Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels play a central role in the regulation of cardiac and neuronal firing rate, and these channels can be dually activated by membrane hyperpolarization and by binding of cyclic nucleotide ...

    Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels play a central role in the regulation of cardiac and neuronal firing rate, and these channels can be dually activated by membrane hyperpolarization and by binding of cyclic nucleotides. cAMP has been shown to directly bind HCN channels and modulate their activity. Despite this, while there are selective inhibitors that block the activation potential of the HCN channels, regulation by cAMP analogs has not been well investigated. A comprehensive screen of 47 cyclic nucleotides with modifications in the nucleobase, ribose moiety, and cyclic phosphate was tested on the three isoforms HCN1, HCN2, and HCN4. 7-CH-cAMP was identified to be a high affinity binder for HCN channels and crosschecked for its ability to act on other cAMP receptor proteins. While 7-CH-cAMP is a general activator for cAMP- and cGMP-dependent protein kinases as well as for the guanine nucleotide exchange factors Epac1 and Epac2, it displays the highest affinity to HCN channels. The molecular basis of the high affinity was investigated by determining the crystal structure of 7-CH-cAMP in complex with the cyclic nucleotide binding domain of HCN4. Electrophysiological studies demonstrate a strong activation potential of 7-CH-cAMP for the HCN4 channel in vivo. So, this makes 7-CH-cAMP a promising activator of the HCN channels in vitro whose functionality can be translated in living cells.


    Organizational Affiliation

    Department of Biochemistry, University of Kassel , Heinrich-Plett-Stra├če 40, 34132 Kassel, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4
A
209Homo sapiensGene Names: HCN4
Find proteins for Q9Y3Q4 (Homo sapiens)
Go to Gene View: HCN4
Go to UniProtKB:  Q9Y3Q4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
7CH
Query on 7CH

Download SDF File 
Download CCD File 
A
(2S,4aR,6R,7R,7aS)-6-(4-amino-7H-pyrrolo[2,3-d]pyrimidin-7-yl)tetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinine-2,7-diol 2-oxide
7-CH-cAMP
C11 H13 N4 O6 P
LCYHXWIEMRESTK-KCGFPETGSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
7CHKd: 27 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.198 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 96.010α = 90.00
b = 96.010β = 90.00
c = 50.170γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
ADSCdata collection
AMoREphasing
REFMACrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-19
    Type: Initial release
  • Version 1.1: 2014-05-28
    Type: Database references