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- PDB-9ith: Nav1.5 in complex with TTX -

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Basic information

Entry
Database: PDB / ID: 9ith
TitleNav1.5 in complex with TTX
ComponentsSodium channel protein type 5 subunit alpha
KeywordsMEMBRANE 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 Purkinje myocyte action potential / voltage-gated sodium channel activity involved in SA node cell action potential / bundle of His cell action potential / regulation of ventricular cardiac muscle cell membrane depolarization / 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 ...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 Purkinje myocyte action potential / voltage-gated sodium channel activity involved in SA node cell action potential / bundle of His cell action potential / regulation of ventricular cardiac muscle cell membrane depolarization / 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 / response to denervation involved in regulation of muscle adaptation / membrane depolarization during atrial cardiac muscle cell action potential / cardiac ventricle development / regulation of atrial cardiac muscle cell membrane repolarization / voltage-gated sodium channel activity involved in cardiac muscle cell action potential / brainstem development / membrane depolarization during AV node cell action potential / membrane depolarization during bundle of His cell action potential / membrane depolarization during Purkinje myocyte cell action potential / regulation of atrial cardiac muscle cell membrane depolarization / positive regulation of action potential / atrial cardiac muscle cell action potential / telencephalon development / cardiac conduction system development / membrane depolarization during cardiac muscle cell action potential / membrane depolarization during action potential / positive regulation of sodium ion transport / regulation of sodium ion transmembrane transport / ventricular cardiac muscle cell action potential / regulation of ventricular cardiac muscle cell membrane repolarization / cardiac muscle cell action potential involved in contraction / voltage-gated sodium channel complex / regulation of cardiac muscle cell contraction / Interaction between L1 and Ankyrins / ankyrin binding / voltage-gated sodium channel activity / sodium ion transport / nitric-oxide synthase binding / Phase 0 - rapid depolarisation / fibroblast growth factor binding / odontogenesis of dentin-containing tooth / regulation of heart rate by cardiac conduction / lateral plasma membrane / intercalated disc / membrane depolarization / cardiac muscle contraction / T-tubule / sodium ion transmembrane transport / regulation of heart rate / cellular response to calcium ion / cerebellum development / positive regulation of epithelial cell proliferation / sarcolemma / caveola / Z disc / scaffold protein binding / transmembrane transporter binding / calmodulin binding / protein domain specific binding / ubiquitin protein ligase binding / protein kinase binding / nucleolus / 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 / Sodium ion transport-associated / Voltage-gated sodium channel alpha subunit, inactivation gate / Sodium ion transport-associated / SCN5A-like, C-terminal IQ motif / Voltage gated sodium channel, alpha subunit / Voltage-gated cation channel calcium and sodium / Voltage-dependent channel domain superfamily ...Voltage gated sodium channel, alpha-5 subunit / Voltage-gated Na+ ion channel, cytoplasmic domain / Cytoplasmic domain of voltage-gated Na+ ion channel / Sodium ion transport-associated / Voltage-gated sodium channel alpha subunit, inactivation gate / Sodium ion transport-associated / SCN5A-like, C-terminal IQ motif / 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
Chem-9SR / Sodium channel protein type 5 subunit alpha
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsYan, N. / Li, Z. / Wu, T.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32330052 China
CitationJournal: Proc Natl Acad Sci U S A / Year: 2025
Title: Critical role of extracellular loops in differential modulations of TTX-sensitive and TTX-resistant Na channels.
Authors: Tong Wu / Xinyu Yang / Xueqin Jin / Nieng Yan / Zhangqiang Li /
Abstract: The cardiac voltage-gated sodium channel Na1.5 is resistant to tetrodotoxin (TTXr). Here, we report a cryo-electron microscopy (cryo-EM) structure of wild-type human Na1.5, coexpressed with the β1 ...The cardiac voltage-gated sodium channel Na1.5 is resistant to tetrodotoxin (TTXr). Here, we report a cryo-electron microscopy (cryo-EM) structure of wild-type human Na1.5, coexpressed with the β1 auxiliary subunit and treated with high-concentration TTX, at 3.4 Å resolution. Structural comparison reveals the molecular determinants for the distinct responses to TTX as well as β subunits between TTXr and TTX-sensitive (TTXs) Na channels. A conserved cation-π interaction between the guanidinium group of TTX and Tyr or Phe on the P2 helix in TTXs Na channels is lost in all TTXr subtypes owing to the replacement by Cys/Ser at the corresponding locus, explaining their differential TTX sensitivities. The β1 subunit is invisible in the EM map. Comparison of Na1.5 with Na1.7 and Na1.8, which are, respectively, TTXs and TTXr, identifies four sites on the extracellular loops (ECLs) that may account for their different β1-binding abilities. When the corresponding residues in TTXs Na1.7 are replaced with those from Na1.5, the modulatory effects of β1 on channel activation and inactivation are diminished. Consistently, β1 is absent in the 3D EM reconstruction of this Na1.7 mutant. Together with our previous structure-guided discovery that TTXr channels lack a Cys on the ECL for disulfide bond formation with β2 or β4, the structure-function relationship studies underscore the importance of the ECLs in the mechanistic distinctions between TTXs and TTXr Na channels. The ECLs may be further explored for the development of subtype-specific drugs.
History
DepositionJul 20, 2024Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Aug 20, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)234,59912
Polymers231,7441
Non-polymers2,85511
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Sodium channel protein type 5 subunit alpha / Sodium channel protein cardiac muscle subunit alpha / Sodium channel protein type V subunit alpha / ...Sodium channel protein cardiac muscle subunit alpha / Sodium channel protein type V subunit alpha / Voltage-gated sodium channel subunit alpha Nav1.5 / hH1


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


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 9 / Source method: obtained synthetically / 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-9SR / (1R,5R,6R,7R,9S,11S,12S,13S,14S)-3-amino-14-(hydroxymethyl)-8,10-dioxa-2,4-diazatetracyclo[7.3.1.1~7,11~.0~1,6~]tetradec-3-ene-5,9,12,13,14-pentol (non-preferred name) / Tetrodotoxin


Mass: 319.268 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C11H17N3O8 / Feature type: SUBJECT OF INVESTIGATION / Comment: toxin*YM
#4: Chemical ChemComp-9Z9 / (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en


Mass: 544.805 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C34H56O5 / Comment: detergent*YM
Has ligand of interestY
Has protein modificationY

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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: Nav1.5 in complex with TTX / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
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
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 FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 48 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 145139 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0039588
ELECTRON MICROSCOPYf_angle_d0.72413006
ELECTRON MICROSCOPYf_dihedral_angle_d7.8151463
ELECTRON MICROSCOPYf_chiral_restr0.0441532
ELECTRON MICROSCOPYf_plane_restr0.0051577

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