7FBS image
Entry Detail
PDB ID:
7FBS
EMDB ID:
Title:
structure of a channel
Biological Source:
PDB Version:
Deposition Date:
2021-07-12
Release Date:
2021-09-22
Method Details:
Experimental Method:
Resolution:
3.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Sodium channel protein type 5 subunit alpha,Sodium channel protein type 5 subunit alpha,Sodium channel protein type 5 subunit alpha,G protein/GFP fusion protein
Mutations:I1487Q,F1488Q,M1489Q
Chain IDs:A
Chain Length:1838
Number of Molecules:1
Biological Source:Rattus norvegicus, Recombinant vesicular stomatitis Indiana virus rVSV-G/GFP
Primary Citation
Open-state structure and pore gating mechanism of the cardiac sodium channel.
Cell 184 5151 ? (2021)
PMID: 34520724 DOI: 10.1016/j.cell.2021.08.021

Abstact

The heartbeat is initiated by voltage-gated sodium channel NaV1.5, which opens rapidly and triggers the cardiac action potential; however, the structural basis for pore opening remains unknown. Here, we blocked fast inactivation with a mutation and captured the elusive open-state structure. The fast inactivation gate moves away from its receptor, allowing asymmetric opening of pore-lining S6 segments, which bend and rotate at their intracellular ends to dilate the activation gate to ∼10 Å diameter. Molecular dynamics analyses predict physiological rates of Na+ conductance. The open-state pore blocker propafenone binds in a high-affinity pose, and drug-access pathways are revealed through the open activation gate and fenestrations. Comparison with mutagenesis results provides a structural map of arrhythmia mutations that target the activation and fast inactivation gates. These results give atomic-level insights into molecular events that underlie generation of the action potential, open-state drug block, and fast inactivation of cardiac sodium channels, which initiate the heartbeat.

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