+
Open data
-
Basic information
Entry | Database: PDB / ID: 7nmn | ||||||
---|---|---|---|---|---|---|---|
Title | Rabbit HCN4 stabilised in amphipol A8-35 | ||||||
![]() | Potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4,Rabbit HCN4 | ||||||
![]() | MEMBRANE PROTEIN / cryo-EM / ion channels | ||||||
Function / homology | ![]() HCN channel complex / regulation of membrane depolarization / intracellularly cAMP-activated cation channel activity / sodium channel activity / voltage-gated potassium channel activity / cAMP binding / cellular response to cAMP / potassium ion transmembrane transport / regulation of heart rate / axon ...HCN channel complex / regulation of membrane depolarization / intracellularly cAMP-activated cation channel activity / sodium channel activity / voltage-gated potassium channel activity / cAMP binding / cellular response to cAMP / potassium ion transmembrane transport / regulation of heart rate / axon / dendrite / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å | ||||||
![]() | Chaves-Sanjuan, A. | ||||||
![]() | ![]() Title: Gating movements and ion permeation in HCN4 pacemaker channels. Authors: Andrea Saponaro / Daniel Bauer / M Hunter Giese / Paolo Swuec / Alessandro Porro / Federica Gasparri / Atiyeh Sadat Sharifzadeh / Antonio Chaves-Sanjuan / Laura Alberio / Giacomo Parisi / ...Authors: Andrea Saponaro / Daniel Bauer / M Hunter Giese / Paolo Swuec / Alessandro Porro / Federica Gasparri / Atiyeh Sadat Sharifzadeh / Antonio Chaves-Sanjuan / Laura Alberio / Giacomo Parisi / Gabriele Cerutti / Oliver B Clarke / Kay Hamacher / Henry M Colecraft / Filippo Mancia / Wayne A Hendrickson / Steven A Siegelbaum / Dario DiFrancesco / Martino Bolognesi / Gerhard Thiel / Bina Santoro / Anna Moroni / ![]() ![]() ![]() ![]() Abstract: The HCN1-4 channel family is responsible for the hyperpolarization-activated cation current I/I that controls automaticity in cardiac and neuronal pacemaker cells. We present cryoelectron microscopy ...The HCN1-4 channel family is responsible for the hyperpolarization-activated cation current I/I 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 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. | ||||||
History |
|
-
Structure visualization
Movie |
![]() |
---|---|
Structure viewer | Molecule: ![]() ![]() |
-
Downloads & links
-
Download
PDBx/mmCIF format | ![]() | 372.5 KB | Display | ![]() |
---|---|---|---|---|
PDB format | ![]() | 282.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
---|
-Related structure data
Related structure data | ![]() 12466MC ![]() 7np3C ![]() 7np4C M: map data used to model this data C: citing same article ( |
---|---|
Similar structure data |
-
Links
-
Assembly
Deposited unit | ![]()
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Noncrystallographic symmetry (NCS) | NCS domain:
NCS domain segments:
NCS oper:
|
-
Components
#1: Protein | Mass: 98208.383 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
---|
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
---|---|
EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-
Sample preparation
Component | Name: Rabbit HCN4 cAMP-unbound stabilised in amphipol A8-35 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
---|---|
Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7 |
Specimen | Conc.: 0.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
-
Electron microscopy imaging
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
---|---|
Microscopy | Model: FEI TALOS ARCTICA |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Average exposure time: 62 sec. / Electron dose: 40 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 1571 |
-
Processing
Software |
| ||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
EM software |
| ||||||||||||||||||||||||||||||||
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 100130 | ||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C4 (4 fold cyclic) | ||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 11406 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||
Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 57.9 Å2 | ||||||||||||||||||||||||||||||||
Refine LS restraints |
| ||||||||||||||||||||||||||||||||
Refine LS restraints NCS |
|