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- EMDB-41071: Cryo-EM structure of rat cardiac sodium channel NaV1.5 with batra... -

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Entry
Database: EMDB / ID: EMD-41071
TitleCryo-EM structure of rat cardiac sodium channel NaV1.5 with batrachotoxin analog BTX-B
Map dataSharpened map CryoSPARC
Sample
  • Organelle or cellular component: Sodium channel NaV1.5 and batrachotoxinin-A 20-alpha-benzoate
    • Protein or peptide: Sodium channel protein type 5 subunit alpha,Green fluorescent protein
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en
  • Ligand: (1R)-1-[(5aR,7aR,9R,11aS,11bS,12R,13aR)-9,12-dihydroxy-2,11a-dimethyl-1,2,3,4,7a,8,9,10,11,11a,12,13-dodecahydro-7H-9,11b-epoxy-13a,5a-prop[1]enophenanthro[2,1-f][1,4]oxazepin-14-yl]ethyl benzoate
  • Ligand: water
KeywordsIon channel / Sodium channel / Voltage-gated channel / Sodium transport / MEMBRANE PROTEIN
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 / sodium channel complex / 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 ...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 / sodium channel complex / 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 / regulation of atrial cardiac muscle cell membrane depolarization / voltage-gated sodium channel complex / membrane depolarization during cardiac muscle cell action potential / sodium ion import across plasma membrane / positive regulation of sodium ion transport / cardiac muscle cell action potential involved in contraction / ventricular cardiac muscle cell action potential / regulation of cardiac muscle cell contraction / voltage-gated sodium channel activity / regulation of ventricular cardiac muscle cell membrane repolarization / ankyrin binding / positive regulation of heart rate / sodium ion transport / fibroblast growth factor binding / nitric-oxide synthase binding / regulation of heart rate by cardiac conduction / odontogenesis of dentin-containing tooth / membrane depolarization / neuronal action potential / 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 / bioluminescence / generation of precursor metabolites and energy / positive regulation of epithelial cell proliferation / caveola / sarcolemma / response to organic cyclic compound / Z disc / scaffold protein binding / transmembrane transporter binding / calmodulin binding / axon / protein domain specific binding / ubiquitin protein ligase binding / protein kinase binding / perinuclear region of cytoplasm / enzyme binding / cell surface / endoplasmic reticulum / 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 / Green fluorescent protein, GFP ...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 / Green fluorescent protein, GFP / Green fluorescent protein-related / Green fluorescent protein / Green fluorescent protein / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Sodium channel protein type 5 subunit alpha / Green fluorescent protein
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat) / Aequorea victoria (jellyfish)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsTonggu L / Wisedchaisri G / Gamal El-Din TM / Zheng N / Catterall WA
Funding support United States, 4 items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R01 HL112808 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R35 NS111573 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM117263 United States
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Nat Commun / Year: 2024
Title: Dual receptor-sites reveal the structural basis for hyperactivation of sodium channels by poison-dart toxin batrachotoxin.
Authors: Lige Tonggu / Goragot Wisedchaisri / Tamer M Gamal El-Din / Michael J Lenaeus / Matthew M Logan / Tatsuya Toma / Justin Du Bois / Ning Zheng / William A Catterall /
Abstract: The poison dart toxin batrachotoxin is exceptional for its high potency and toxicity, and for its multifaceted modification of the function of voltage-gated sodium channels. By using cryogenic ...The poison dart toxin batrachotoxin is exceptional for its high potency and toxicity, and for its multifaceted modification of the function of voltage-gated sodium channels. By using cryogenic electron microscopy, we identify two homologous, but nonidentical receptor sites that simultaneously bind two molecules of toxin, one at the interface between Domains I and IV, and the other at the interface between Domains III and IV of the cardiac sodium channel. Together, these two bound toxin molecules stabilize α/π helical conformation in the S6 segments that gate the pore, and one of the bound BTX-B molecules interacts with the crucial Lys1421 residue that is essential for sodium conductance and selectivity via an apparent water-bridged hydrogen bond. Overall, our structure provides insight into batrachotoxin's potency, efficacy, and multifaceted functional effects on voltage-gated sodium channels via a dual receptor site mechanism.
History
DepositionJun 16, 2023-
Header (metadata) releaseMar 6, 2024-
Map releaseMar 6, 2024-
UpdateMar 27, 2024-
Current statusMar 27, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_41071.png

Downloads & links

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Map

FileDownload / File: emd_41071.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSharpened map CryoSPARC
Voxel sizeX=Y=Z: 0.8255 Å
Density
Contour LevelBy AUTHOR: 0.1
Minimum - Maximum-0.69105214 - 0.9570862
Average (Standard dev.)0.0034284482 (±0.023764394)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 264.16 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map A

Fileemd_41071_half_map_1.map
AnnotationHalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map B

Fileemd_41071_half_map_2.map
AnnotationHalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Sodium channel NaV1.5 and batrachotoxinin-A 20-alpha-benzoate

EntireName: Sodium channel NaV1.5 and batrachotoxinin-A 20-alpha-benzoate
Components
  • Organelle or cellular component: Sodium channel NaV1.5 and batrachotoxinin-A 20-alpha-benzoate
    • Protein or peptide: Sodium channel protein type 5 subunit alpha,Green fluorescent protein
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en
  • Ligand: (1R)-1-[(5aR,7aR,9R,11aS,11bS,12R,13aR)-9,12-dihydroxy-2,11a-dimethyl-1,2,3,4,7a,8,9,10,11,11a,12,13-dodecahydro-7H-9,11b-epoxy-13a,5a-prop[1]enophenanthro[2,1-f][1,4]oxazepin-14-yl]ethyl benzoate
  • Ligand: water

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Supramolecule #1: Sodium channel NaV1.5 and batrachotoxinin-A 20-alpha-benzoate

SupramoleculeName: Sodium channel NaV1.5 and batrachotoxinin-A 20-alpha-benzoate
type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 200 KDa

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Macromolecule #1: Sodium channel protein type 5 subunit alpha,Green fluorescent protein

MacromoleculeName: Sodium channel protein type 5 subunit alpha,Green fluorescent protein
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Aequorea victoria (jellyfish)
Molecular weightTheoretical: 213.523875 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MANLLLPRGT SSFRRFTRES LAAIEKRMAE KQTRGGSATS QESREGLQEE EAPRPQLDLQ ASKKLPDLYG NPPRELIGEP LEDLDPFYS TQKTFIVLNK GKTIFRFSAT NALYVLSPFH PVRRAAVKIL VHSLFSMLIM CTILTNCVFM AQHDPPPWTK Y VEYTFTAI ...String:
MANLLLPRGT SSFRRFTRES LAAIEKRMAE KQTRGGSATS QESREGLQEE EAPRPQLDLQ ASKKLPDLYG NPPRELIGEP LEDLDPFYS TQKTFIVLNK GKTIFRFSAT NALYVLSPFH PVRRAAVKIL VHSLFSMLIM CTILTNCVFM AQHDPPPWTK Y VEYTFTAI YTFESLVKIL ARGFCLHAFT FLRDPWNWLD FSVIVMAYTT EFVDLDNVSA LRTFRVLRAL KTISVISGLK TI VGALIQS VKKLADVMVL TVFCLSVFAL IGLQLFMGNL RHKCVRNFTE LNGTNGSVEA DGLVWNSLDV YLNDPANYLL KNG TTDVLL CGNSSDAGTC PEGYRCLKAG ENPDHGYTSF DSFAWAFLAL FRLMTQDCWE RLYQQTLRSA GKIYMIFFML VIFL GSFYL VNLILAVVAM AYEEQNQATI AETEEKEKRF QEAMEMLKKE HEALTIRGVD TVSRSSRQRA LSAVSVLTSA LEELE ESHR KCPPCWNRFA QHYLIWECCP LWMSIKQKVK FVVMDPFADL TITMCIVLNT LFMALEHYNM TAEFEEMLQV GNLVFT GIF TAEMTFKIIA LDPYYYFQQG WNIFDSIIVI LSLMELGLSR MGNLSVLRSF RLLRVFKLAK SWPTLNTLIK IIGNSVG AL GNLTLVLAII VFIFAVVGMQ LFGKNYSELR HRISDSGLLP RWHMMDFFHA FLIIFRILCG EWIETMWDCM EVSGQSLC L LVFLLVMVIG NLVVLNLFLA LLLSSFSADN LTAPDEDGEM NNLQLALARI QRGLRFVKRT TWDFCCGILR RRPKKPAAL ATHSQLPSCI TAPRSPPPPE VEKVPPARKE TRFEEDKRPG QGTPGDSEPV CVPIAVAESD TEDQEEDEEN SGKVWWRLRK TCYRIVEHS WFETFIIFMI LLSSGALAFE DIYLEERKTI KVLLEYADKM FTYVFVLEML LKWVAYGFKK YFTNAWCWLD F LIVDVSLV SLVANTLGFA EMGPIKSLRT LRALRPLRAL SRFEGMRVVV NALVGAIPSI MNVLLVCLIF WLIFSIMGVN LF AGKFGRC INQTEGDLPL NYTIVNNKSE CESFNVTGEL YWTKVKVNFD NVGAGYLALL QVATFKGWMD IMYAAVDSRG YEE QPQWED NLYMYIYFVV FIIFGSFFTL NLFIGVIIDN FNQQKKKLGG QDIFMTEEQK KYYNAMKKLG SKKPQKPIPR PLNK YQGFI FDIVTKQAFD VTIMFLICLN MVTMMVETDD QSPEKVNILA KINLLFVAIF TGECIVKMAA LRHYYFTNSW NIFDF VVVI LSIVGTVLSD IIQKYFFSPT LFRVIRLARI GRILRLIRGA KGIRTLLFAL MMSLPALFNI GLLLFLVMFI YSIFGM ANF AYVKWEAGID DMFNFQTFAN SMLCLFQITT SAGWDGLLSP ILNTGPPYCD PNLPNSNGSR GNCGSPAVGI LFFTTYI II SFLIVVNMYI AIILENFSVA TEESTEPLSE DDFDMFYEIW EKFDPEATQF IEYLALSDFA DALSEPLRIA KPNQISLI N MDLPMVSGDR IHCMDILFAF TKRVLGESGE MDALKIQMEE KFMAANPSKI SYEPITTTLR RKHEEVSATV IQRAFRRHL LQRSVKHASF LFRVDLEVLF QGPGSMVSKG EELFTGVVPI LVELDGDVNG HKFSVSGEGE GDATYGKLTL KFICTTGKLP VPWPTLVTT LTYGVQCFSR YPDHMKQHDF FKSAMPEGYV QERTIFFKDD GNYKTRAEVK FEGDTLVNRI ELKGIDFKED G NILGHKLE YNYNSHNVYI MADKQKNGIK VNFKIRHNIE DGSVQLADHY QQNTPIGDGP VLLPDNHYLS TQSALSKDPN EK RDHMVLL EFVTAAGITL GMDELYKGSD YKDDDDK

UniProtKB: Sodium channel protein type 5 subunit alpha, Green fluorescent protein

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Macromolecule #5: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 5 / Number of copies: 3 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine

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Macromolecule #6: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine

MacromoleculeName: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / type: ligand / ID: 6 / Number of copies: 10 / Formula: LBN
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-LBN:
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / phospholipid*YM / POPC

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Macromolecule #7: CHOLESTEROL HEMISUCCINATE

MacromoleculeName: CHOLESTEROL HEMISUCCINATE / type: ligand / ID: 7 / Number of copies: 11 / Formula: Y01
Molecular weightTheoretical: 486.726 Da
Chemical component information

ChemComp-Y01:
CHOLESTEROL HEMISUCCINATE

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Macromolecule #8: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]sp...

MacromoleculeName: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en
type: ligand / ID: 8 / Number of copies: 2 / Formula: 9Z9
Molecular weightTheoretical: 544.805 Da
Chemical component information

ChemComp-9Z9:
(3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en / detergent*YM

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Macromolecule #9: (1R)-1-[(5aR,7aR,9R,11aS,11bS,12R,13aR)-9,12-dihydroxy-2,11a-dime...

MacromoleculeName: (1R)-1-[(5aR,7aR,9R,11aS,11bS,12R,13aR)-9,12-dihydroxy-2,11a-dimethyl-1,2,3,4,7a,8,9,10,11,11a,12,13-dodecahydro-7H-9,11b-epoxy-13a,5a-prop[1]enophenanthro[2,1-f][1,4]oxazepin-14-yl]ethyl benzoate
type: ligand / ID: 9 / Number of copies: 2 / Formula: YIJ
Molecular weightTheoretical: 521.644 Da

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Macromolecule #10: water

MacromoleculeName: water / type: ligand / ID: 10 / Number of copies: 1 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER / Water

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration5 mg/mL
BufferpH: 6
Component:
ConcentrationFormulaName
25.0 mMC3H4N2imidazole
150.0 mMNaClSodium chloridesodium chloride
0.006 % wt/vC56H92O25glyco-diosgenin (GDN)
600.0 nMC31H39NO6batrachotoxinin-A 20-alpha-benzoate
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 20 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 105000
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 2 / Number real images: 7542 / Average exposure time: 2.04 sec. / Average electron dose: 60.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1690000
Startup modelType of model: EMDB MAP
EMDB ID:

20951

Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.1)
Final 3D classificationNumber classes: 3 / Software - Name: cryoSPARC (ver. 3.3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.1)
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.3.1) / Number images used: 86763
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6uz0


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Overall B value: 49.4 / Target criteria: Cross-correlation coefficient
Output model

PDB-8t6l:
Cryo-EM structure of rat cardiac sodium channel NaV1.5 with batrachotoxin analog BTX-B

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