3FFQ

HCN2I 443-640 apo-state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.245 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mapping the structure and conformational movements of proteins with transition metal ion FRET.

Taraska, J.W.Puljung, M.C.Olivier, N.B.Flynn, G.E.Zagotta, W.N.

(2009) Nat Methods 6: 532-537

  • DOI: https://doi.org/10.1038/nmeth.1341
  • Primary Citation of Related Structures:  
    3ETQ, 3FFQ

  • PubMed Abstract: 

    Visualizing conformational dynamics in proteins has been difficult, and the atomic-scale motions responsible for the behavior of most allosteric proteins are unknown. Here we report that fluorescence resonance energy transfer (FRET) between a small fluorescent dye and a nickel ion bound to a dihistidine motif can be used to monitor small structural rearrangements in proteins. This method provides several key advantages over classical FRET, including the ability to measure the dynamics of close-range interactions, the use of small probes with short linkers, a low orientation dependence, and the ability to add and remove unique tunable acceptors. We used this 'transition metal ion FRET' approach along with X-ray crystallography to determine the structural changes of the gating ring of the mouse hyperpolarization-activated cyclic nucleotide-regulated ion channel HCN2. Our results suggest a general model for the conformational switch in the cyclic nucleotide-binding site of cyclic nucleotide-regulated ion channels.


  • Organizational Affiliation

    Department of Physiology and Biophysics, Howard Hughes Medical Institute, University of Washington, Seattle, Washington, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 2
A, B
202Mus musculusMutation(s): 0 
Gene Names: Bcng2bcng2 or hac1Hac1Hcn2
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
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
BR
Query on BR

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth B],
I [auth B],
J [auth B],
K [auth B]
BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.245 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.285α = 90
b = 95.285β = 90
c = 123.555γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description