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- EMDB-60573: Cryo-EM Structure of inhibitor-free hERG Channel -

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Basic information

Entry
Database: EMDB / ID: EMD-60573
TitleCryo-EM Structure of inhibitor-free hERG Channel
Map data
Sample
  • Complex: potassium channel
    • Protein or peptide: Potassium voltage-gated channel subfamily H member 2
Keywordsdrug toxicity / potassium ion / hERG / cryo-EM / MEMBRANE PROTEIN / TRANSPORT PROTEIN
Function / homology
Function and homology information


inward rectifier potassium channel complex / negative regulation of potassium ion export across plasma membrane / regulation of heart rate by hormone / Phase 3 - rapid repolarisation / membrane repolarization during action potential / negative regulation of potassium ion transmembrane transport / membrane repolarization during ventricular cardiac muscle cell action potential / membrane repolarization during cardiac muscle cell action potential / potassium ion export across plasma membrane / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization ...inward rectifier potassium channel complex / negative regulation of potassium ion export across plasma membrane / regulation of heart rate by hormone / Phase 3 - rapid repolarisation / membrane repolarization during action potential / negative regulation of potassium ion transmembrane transport / membrane repolarization during ventricular cardiac muscle cell action potential / membrane repolarization during cardiac muscle cell action potential / potassium ion export across plasma membrane / voltage-gated potassium channel activity involved in ventricular cardiac muscle cell action potential repolarization / regulation of membrane repolarization / membrane repolarization / positive regulation of potassium ion transmembrane transport / delayed rectifier potassium channel activity / Voltage gated Potassium channels / inward rectifier potassium channel activity / potassium ion homeostasis / ventricular cardiac muscle cell action potential / membrane depolarization during action potential / regulation of ventricular cardiac muscle cell membrane repolarization / regulation of potassium ion transmembrane transport / potassium ion import across plasma membrane / regulation of heart rate by cardiac conduction / voltage-gated potassium channel activity / voltage-gated potassium channel complex / cardiac muscle contraction / potassium ion transmembrane transport / regulation of membrane potential / potassium ion transport / cellular response to xenobiotic stimulus / scaffold protein binding / transcription cis-regulatory region binding / ubiquitin protein ligase binding / positive regulation of DNA-templated transcription / perinuclear region of cytoplasm / cell surface / protein homodimerization activity / identical protein binding / plasma membrane
Similarity search - Function
Potassium channel, voltage-dependent, ERG / : / Potassium channel, voltage-dependent, EAG/ELK/ERG / PAS domain / PAS-associated, C-terminal / PAC domain profile. / PAC motif / Motif C-terminal to PAS motifs (likely to contribute to PAS structural domain) / Cyclic nucleotide-monophosphate binding domain / Cyclic nucleotide-binding domain ...Potassium channel, voltage-dependent, ERG / : / Potassium channel, voltage-dependent, EAG/ELK/ERG / PAS domain / PAS-associated, C-terminal / PAC domain profile. / PAC motif / Motif C-terminal to PAS motifs (likely to contribute to PAS structural domain) / Cyclic nucleotide-monophosphate binding domain / Cyclic nucleotide-binding domain / cAMP/cGMP binding motif profile. / Cyclic nucleotide-binding domain / Cyclic nucleotide-binding domain superfamily / PAS repeat profile. / PAS domain / RmlC-like jelly roll fold / PAS domain superfamily / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Voltage-gated inwardly rectifying potassium channel KCNH2
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.27 Å
AuthorsMiyashita Y / Moriya T / Kato T / Kawasaki M / Yasuda Y / Adachi N / Suzuki K / Ogasawara S / Saito T / Senda T / Murata T
Funding support Japan, 2 items
OrganizationGrant numberCountry
Japan Agency for Medical Research and Development (AMED) Japan
Japan Society for the Promotion of Science (JSPS) Japan
CitationJournal: Structure / Year: 2024
Title: Improved higher resolution cryo-EM structures reveal the binding modes of hERG channel inhibitors.
Authors: Yasuomi Miyashita / Toshio Moriya / Takafumi Kato / Masato Kawasaki / Satoshi Yasuda / Naruhiko Adachi / Kano Suzuki / Satoshi Ogasawara / Tetsuichiro Saito / Toshiya Senda / Takeshi Murata /
Abstract: During drug discovery, it is crucial to exclude compounds with toxic effects. The human ether-à-go-go-related gene (hERG) channel is essential for maintaining cardiac repolarization and is a ...During drug discovery, it is crucial to exclude compounds with toxic effects. The human ether-à-go-go-related gene (hERG) channel is essential for maintaining cardiac repolarization and is a critical target in drug safety evaluation due to its role in drug-induced arrhythmias. Inhibition of the hERG channel can lead to severe cardiac issues, including Torsades de Pointes tachycardia. Understanding hERG inhibition mechanisms is essential to avoid these toxicities. Several structural studies have elucidated the interactions between inhibitors and hERG. However, orientation and resolution issues have so far limited detailed insights. Here, we used digitonin to analyze the apo state of hERG, which resolved orientation issues and improved the resolution. We determined the structure of hERG bound to astemizole, showing a clear map in the pore pathway. Using this strategy, we also analyzed the binding modes of E-4031 and pimozide. These insights into inhibitor interactions with hERG may aid safer drug design and enhance cardiac safety.
History
DepositionJun 18, 2024-
Header (metadata) releaseSep 18, 2024-
Map releaseSep 18, 2024-
UpdateOct 9, 2024-
Current statusOct 9, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_60573.png

Downloads & links

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Map

FileDownload / File: emd_60573.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 360 pix.
= 298.8 Å		0.83 Å/pix.
x 360 pix.
= 298.8 Å		0.83 Å/pix.
x 360 pix.
= 298.8 Å

Surface

Projections

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.83 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.35
Minimum - Maximum-1.849361 - 3.0750237
Average (Standard dev.)0.0043846886 (±0.051295955)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 298.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_60573_msk_1.map
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Half map: #2

Fileemd_60573_half_map_1.map
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Half map: #1

Fileemd_60573_half_map_2.map
Projections & Slices
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Sample components

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Entire : potassium channel

EntireName: potassium channel
Components
  • Complex: potassium channel
    • Protein or peptide: Potassium voltage-gated channel subfamily H member 2

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Supramolecule #1: potassium channel

SupramoleculeName: potassium channel / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Potassium voltage-gated channel subfamily H member 2

MacromoleculeName: Potassium voltage-gated channel subfamily H member 2 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 91.792086 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MPVRRGHVAP QNTFLDTIIR KFEGQSRKFI IANARVENCA VIYCNDGFCE LCGYSRAEVM QRPCTCDFLH GPRTQRRAAA QIAQALLGA EERKVEIAFY RKDGSCFLCL VDVVPVKNED GAVIMFILNF EVVMEKDMVG SSPTSDREII APKIKERTHN V TEKVTQVL ...String:
MPVRRGHVAP QNTFLDTIIR KFEGQSRKFI IANARVENCA VIYCNDGFCE LCGYSRAEVM QRPCTCDFLH GPRTQRRAAA QIAQALLGA EERKVEIAFY RKDGSCFLCL VDVVPVKNED GAVIMFILNF EVVMEKDMVG SSPTSDREII APKIKERTHN V TEKVTQVL SLGADVLPEY KLQAPRIHRW TILHYSPFKA VWDWLILLLV IYTAVFTPYS AAFLLKETEE GPPATECGYA CQ PLAVVDL IVDIMFIVDI LINFRTTYVN ANEEVVSHPG RIAVHYFKGW FLIDMVAAIP FDLLIFGSGS EELIGLLKTA RLL RLVRVA RKLDRYSEYG AAVLFLLMCT FALIAHWLAC IWYAIGNMEQ PHMDSRIGWL HNLGDQIGKP YNSSGLGGPS IKDK YVTAL YFTFSSLTSV GFGNVSPNTN SEKIFSICVM LIGSLMYASI FGNVSAIIQR LYSGTARYHT QMLRVREFIR FHQIP NPLR QRLEEYFQHA WSYTNGIDMN AVLKGFPECL QADICLHLNR SLLQHCKPFR GATKGCLRAL AMKFKTTHAP PGDTLV HAG DLLTALYFIS RGSIEILRGD VVVAILGKND IFGEPLNLYA RPGKSNGDVR ALTYCDLHKI HRDDLLEVLD MYPEFSD HF WSSLEITFNL RDTNMIPGGR QYQELPRCPA PTPSLLNIPL SSPGRRPRGD VESRLDALQR QLNRLETRLS ADMATVLQ L LQRQMTLVPP AYSAVTTPGP GPTSTSPLLP VSPLPTLTLD SLSQVSQFMA CEELPPGAPE LPQEGPTRRL SLPGQLGAL TSQPLHRHGS DPGSLEVLFQ

UniProtKB: Voltage-gated inwardly rectifying potassium channel KCNH2, Voltage-gated inwardly rectifying potassium channel KCNH2, Voltage-gated inwardly rectifying potassium channel KCNH2

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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

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.27 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 254567
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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