6UQF

Human HCN1 channel in a hyperpolarized conformation

  • Classification: MEMBRANE PROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): No 

  • Deposited: 2019-10-19 Released: 2019-12-11 
  • Deposition Author(s): Lee, C.-H., MacKinnon, R.
  • Funding Organization(s): National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI), Howard Hughes Medical Institute (HHMI)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.04 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Voltage Sensor Movements during Hyperpolarization in the HCN Channel.

Lee, C.H.MacKinnon, R.

(2019) Cell 179: 1582

  • DOI: 10.1016/j.cell.2019.11.006
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The hyperpolarization-activated cyclic nucleotide-gated (HCN) channel is a voltage-gated cation channel that mediates neuronal and cardiac pacemaker activity. The HCN channel exhibits reversed voltage dependence, meaning it closes with depolarization ...

    The hyperpolarization-activated cyclic nucleotide-gated (HCN) channel is a voltage-gated cation channel that mediates neuronal and cardiac pacemaker activity. The HCN channel exhibits reversed voltage dependence, meaning it closes with depolarization and opens with hyperpolarization. Different from Na + , Ca 2+ , and Kv1-Kv7 channels, the HCN channel does not have domain-swapped voltage sensors. We introduced a reversible, metal-mediated cross bridge into the voltage sensors to create the chemical equivalent of a hyperpolarized conformation and determined the structure using cryoelectron microscopy (cryo-EM). Unlike the depolarized HCN channel, the S4 helix is displaced toward the cytoplasm by two helical turns. Near the cytoplasm, the S4 helix breaks into two helices, one running parallel to the membrane surface, analogous to the S4-S5 linker of domain-swapped voltage-gated channels. These findings suggest a basis for allosteric communication between voltage sensors and the gate in this kind of channel. They also imply that voltage sensor movements are not the same in all voltage-gated channels.


    Organizational Affiliation

    Laboratory of Molecular Neurobiology and Biophysics, Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA. Electronic address: mackinn@rockefeller.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 1A, B, C, D660Homo sapiensMutation(s): 0 
Gene Names: HCN1BCNG1
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
HCN1 hyperpolarization-activated channel in hyperpolarized conformation
Find proteins for O60741 (Homo sapiens)
Explore O60741 
Go to UniProtKB:  O60741
NIH Common Fund Data Resources
PHAROS  O60741
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CMP
Query on CMP

Download CCD File 
A, B, C, D
ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE
C10 H12 N5 O6 P
IVOMOUWHDPKRLL-KQYNXXCUSA-N
 Ligand Interaction
HG
Query on HG

Download CCD File 
A, B, C, D
MERCURY (II) ION
Hg
BQPIGGFYSBELGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.04 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesGM43949
Howard Hughes Medical Institute (HHMI)United States--

Revision History 

  • Version 1.0: 2019-12-11
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Author supporting evidence, Database references
  • Version 1.2: 2019-12-25
    Changes: Database references