5KHH

HCN2 CNBD in complex with inosine-3', 5'-cyclic monophosphate (cIMP)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Cyclic Purine and Pyrimidine Nucleotides Bind to the HCN2 Ion Channel and Variably Promote C-Terminal Domain Interactions and Opening.

Ng, L.C.Putrenko, I.Baronas, V.Van Petegem, F.Accili, E.A.

(2016) Structure 24: 1629-1642

  • DOI: https://doi.org/10.1016/j.str.2016.06.024
  • Primary Citation of Related Structures:  
    5KHG, 5KHH, 5KHI, 5KHJ, 5KHK

  • PubMed Abstract: 

    Cyclic AMP is thought to facilitate the opening of the HCN2 channel by binding to a C-terminal domain and promoting or inhibiting interactions between subunits. Here, we correlated the ability of cyclic nucleotides to promote interactions of isolated HCN2 C-terminal domains in solution with their ability to facilitate channel opening. Cyclic IMP, a cyclic purine nucleotide, and cCMP, a cyclic pyrimidine nucleotide, bind to a C-terminal domain containing the cyclic nucleotide-binding domain but, in contrast to other cyclic nucleotides examined, fail to promote its oligomerization, and produce only modest facilitation of opening of the full-length channel. Comparisons between ligand bound structures identify a region between the sixth and seventh β strands and the distal C helix as important for facilitation and tight binding. We propose that promotion of interactions between the C-terminal domains by a given ligand contribute to its ability to facilitate opening of the full-length channel.


  • Organizational Affiliation

    Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 2204Mus musculusMutation(s): 0 
Gene Names: Hcn2Bcng2Hac1
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
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
6SW
Query on 6SW

Download Ideal Coordinates CCD File 
B [auth A]Inosine-3',5'-cyclic monophosphate
C10 H11 N4 O7 P
DMJWGQPYNRPLGA-KQYNXXCUSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CSX
Query on CSX
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.77 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.217 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.037α = 90
b = 96.037β = 90
c = 115.913γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-14
    Type: Initial release
  • Version 1.1: 2016-10-19
    Changes: Database references
  • Version 1.2: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description