7NP4

cAMP-bound rabbit HCN4 stabilized in LMNG-CHS detergent mixture


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Gating movements and ion permeation in HCN4 pacemaker channels.

Saponaro, A.Bauer, D.Giese, M.H.Swuec, P.Porro, A.Gasparri, F.Sharifzadeh, A.S.Chaves-Sanjuan, A.Alberio, L.Parisi, G.Cerutti, G.Clarke, O.B.Hamacher, K.Colecraft, H.M.Mancia, F.Hendrickson, W.A.Siegelbaum, S.A.DiFrancesco, D.Bolognesi, M.Thiel, G.Santoro, B.Moroni, A.

(2021) Mol Cell 81: 2929-2943.e6

  • DOI: https://doi.org/10.1016/j.molcel.2021.05.033
  • Primary Citation of Related Structures:  
    7NMN, 7NP3, 7NP4

  • PubMed Abstract: 

    The HCN1-4 channel family is responsible for the hyperpolarization-activated cation current I f /I h that controls automaticity in cardiac and neuronal pacemaker cells. We present cryoelectron microscopy (cryo-EM) structures of HCN4 in the presence or absence of bound cAMP, displaying the pore domain in closed and open conformations. Analysis of cAMP-bound and -unbound structures sheds light on how ligand-induced transitions in the channel cytosolic portion mediate the effect of cAMP on channel gating and highlights the regulatory role of a Mg 2+ coordination site formed between the C-linker and the S4-S5 linker. Comparison of open/closed pore states shows that the cytosolic gate opens through concerted movements of the S5 and S6 transmembrane helices. Furthermore, in combination with molecular dynamics analyses, the open pore structures provide insights into the mechanisms of K + /Na + permeation. Our results contribute mechanistic understanding on HCN channel gating, cyclic nucleotide-dependent modulation, and ion permeation.


  • Organizational Affiliation

    Department of Biosciences, University of Milan, Milan, Italy.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4,Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4
A, B, C, D
892Oryctolagus cuniculusMutation(s): 0 
Gene Names: HCN4HAC4
Membrane Entity: Yes 
UniProt
Find proteins for Q9TV66 (Oryctolagus cuniculus)
Explore Q9TV66 
Go to UniProtKB:  Q9TV66
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9TV66
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Leducq FoundationUnited StatesTNE19CVD03
Fondazione CARIPLOItaly2018-0231
European Research Council (ERC)European UnionERC Advanced grant noMAGIC 695078
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesNIH grants R01-NS109366
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesP41-GM116799
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesR01-GM107462 via Type a message

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-11
    Type: Initial release
  • Version 1.1: 2024-07-10
    Changes: Data collection