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- PDB-6lqa: voltage-gated sodium channel Nav1.5 with quinidine -

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Basic information

Entry
Database: PDB / ID: 6lqa
Titlevoltage-gated sodium channel Nav1.5 with quinidine
ComponentsSodium channel protein type 5 subunit alpha
KeywordsTRANSPORT PROTEIN / membrane protein / Voltage-gated sodium channel
Function / homology
Function and homology information


voltage-gated sodium channel activity involved in AV node cell action potential / voltage-gated sodium channel activity involved in bundle of His cell action potential / voltage-gated sodium channel activity involved in SA node cell action potential / bundle of His cell action potential / AV node cell action potential / SA node cell action potential / AV node cell to bundle of His cell communication / membrane depolarization during SA node cell action potential / cardiac ventricle development / response to denervation involved in regulation of muscle adaptation ...voltage-gated sodium channel activity involved in AV node cell action potential / voltage-gated sodium channel activity involved in bundle of His cell action potential / voltage-gated sodium channel activity involved in SA node cell action potential / bundle of His cell action potential / AV node cell action potential / SA node cell action potential / AV node cell to bundle of His cell communication / membrane depolarization during SA node cell action potential / cardiac ventricle development / response to denervation involved in regulation of muscle adaptation / regulation of ventricular cardiac muscle cell membrane depolarization / regulation of atrial cardiac muscle cell membrane repolarization / membrane depolarization during atrial cardiac muscle cell action potential / membrane depolarization during action potential / voltage-gated sodium channel activity involved in Purkinje myocyte action potential / membrane depolarization during AV node cell action potential / regulation of sodium ion transmembrane transport / membrane depolarization during bundle of His cell action potential / brainstem development / membrane depolarization during Purkinje myocyte cell action potential / voltage-gated sodium channel activity involved in cardiac muscle cell action potential / positive regulation of action potential / atrial cardiac muscle cell action potential / telencephalon development / cardiac conduction system development / regulation of atrial cardiac muscle cell membrane depolarization / voltage-gated sodium channel complex / membrane depolarization during cardiac muscle cell action potential / positive regulation of sodium ion transport / cardiac muscle cell action potential involved in contraction / ventricular cardiac muscle cell action potential / high voltage-gated calcium channel activity / regulation of cardiac muscle cell contraction / voltage-gated sodium channel activity / regulation of ventricular cardiac muscle cell membrane repolarization / Interaction between L1 and Ankyrins / ankyrin binding / sodium ion transport / fibroblast growth factor binding / voltage-gated calcium channel complex / nitric-oxide synthase binding / regulation of heart rate by cardiac conduction / Phase 0 - rapid depolarisation / odontogenesis of dentin-containing tooth / calcium ion import across plasma membrane / membrane depolarization / sodium ion transmembrane transport / intercalated disc / lateral plasma membrane / cardiac muscle contraction / T-tubule / cellular response to calcium ion / regulation of heart rate / cerebellum development / positive regulation of epithelial cell proliferation / caveola / sarcolemma / Z disc / scaffold protein binding / transmembrane transporter binding / calmodulin binding / protein domain specific binding / ubiquitin protein ligase binding / nucleolus / protein kinase binding / perinuclear region of cytoplasm / enzyme binding / cell surface / endoplasmic reticulum / nucleoplasm / membrane / plasma membrane
Similarity search - Function
Voltage gated sodium channel, alpha-5 subunit / Voltage-gated Na+ ion channel, cytoplasmic domain / Cytoplasmic domain of voltage-gated Na+ ion channel / Voltage-gated sodium channel alpha subunit, inactivation gate / Sodium ion transport-associated / Sodium ion transport-associated / Voltage gated sodium channel, alpha subunit / Voltage-gated cation channel calcium and sodium / Voltage-dependent channel domain superfamily / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Quinidine / Sodium channel protein type 5 subunit alpha
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsYan, N. / Li, Z. / Pan, X. / Huang, G.
Funding support China, 1items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2016YFA0500402 China
CitationJournal: Angew Chem Int Ed Engl / Year: 2021
Title: Structural Basis for Pore Blockade of the Human Cardiac Sodium Channel Na 1.5 by the Antiarrhythmic Drug Quinidine*.
Authors: Zhangqiang Li / Xueqin Jin / Tong Wu / Gaoxingyu Huang / Kun Wu / Jianlin Lei / Xiaojing Pan / Nieng Yan /
Abstract: Na 1.5, the primary voltage-gated Na (Na ) channel in heart, is a major target for class I antiarrhythmic agents. Here we present the cryo-EM structure of full-length human Na 1.5 bound to quinidine, ...Na 1.5, the primary voltage-gated Na (Na ) channel in heart, is a major target for class I antiarrhythmic agents. Here we present the cryo-EM structure of full-length human Na 1.5 bound to quinidine, a class Ia antiarrhythmic drug, at 3.3 Å resolution. Quinidine is positioned right beneath the selectivity filter in the pore domain and coordinated by residues from repeats I, III, and IV. Pore blockade by quinidine is achieved through both direct obstruction of the ion permeation path and induced rotation of an invariant Tyr residue that tightens the intracellular gate. Structural comparison with a truncated rat Na 1.5 in the presence of flecainide, a class Ic agent, reveals distinct binding poses for the two antiarrhythmics within the pore domain. Our work reported here, along with previous studies, reveals the molecular basis for the mechanism of action of class I antiarrhythmic drugs.
History
DepositionJan 13, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 24, 2021Provider: repository / Type: Initial release
Revision 1.1May 5, 2021Group: Database references / Category: citation / citation_author / Item: _citation.title / _citation_author.identifier_ORCID
Revision 1.2May 19, 2021Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

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Assembly

Deposited unit
B: Sodium channel protein type 5 subunit alpha
hetero molecules


Theoretical massNumber of molelcules
Total (without water)234,05911
Polymers231,7441
Non-polymers2,31510
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area2210 Å2
ΔGint28 kcal/mol
Surface area62890 Å2

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Components

#1: Protein Sodium channel protein type 5 subunit alpha / / HH1 / Sodium channel protein cardiac muscle subunit alpha / Sodium channel protein type V subunit ...HH1 / Sodium channel protein cardiac muscle subunit alpha / Sodium channel protein type V subunit alpha / Voltage-gated sodium channel subunit alpha Nav1.5


Mass: 231743.938 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SCN5A / Production host: Homo sapiens (human) / References: UniProt: Q14524
#2: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 9
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#3: Chemical ChemComp-QDN / Quinidine / (9S)-6'-methoxycinchonan-9-ol / Quinidine


Mass: 324.417 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H24N2O2 / Comment: antiarrhythmic*YM
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Voltage-gated sodium channel with drug / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 48 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 124954 / Symmetry type: POINT

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