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- EMDB-30413: Cryo-EM structure of K+-bound hERG channel in the presence of ast... -

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Basic information

Entry
Database: EMDB / ID: EMD-30413
TitleCryo-EM structure of K+-bound hERG channel in the presence of astemizole
Map data
Sample
  • Organelle or cellular component: potassium channel
    • Protein or peptide: potassium channel
  • Ligand: POTASSIUM IONPotassium
Keywordspotassium channel / TRANSPORT PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsAsai T / Adachi N
Funding support Japan, 3 items
OrganizationGrant numberCountry
Japan Agency for Medical Research and Development (AMED)JP20am0101071 Japan
Japan Agency for Medical Research and Development (AMED)JP20am0101083 Japan
Japan Society for the Promotion of Science (JSPS)18H05425 Japan
CitationJournal: Structure / Year: 2021
Title: Cryo-EM Structure of K-Bound hERG Channel Complexed with the Blocker Astemizole.
Authors: Tatsuki Asai / Naruhiko Adachi / Toshio Moriya / Hideyuki Oki / Takamitsu Maru / Masato Kawasaki / Kano Suzuki / Sisi Chen / Ryohei Ishii / Kazuko Yonemori / Shigeru Igaki / Satoshi Yasuda / ...Authors: Tatsuki Asai / Naruhiko Adachi / Toshio Moriya / Hideyuki Oki / Takamitsu Maru / Masato Kawasaki / Kano Suzuki / Sisi Chen / Ryohei Ishii / Kazuko Yonemori / Shigeru Igaki / Satoshi Yasuda / Satoshi Ogasawara / Toshiya Senda / Takeshi Murata /
Abstract: The hERG channel is a voltage-gated potassium channel involved in cardiac repolarization. Off-target hERG inhibition by drugs has become a critical issue in the pharmaceutical industry. The three- ...The hERG channel is a voltage-gated potassium channel involved in cardiac repolarization. Off-target hERG inhibition by drugs has become a critical issue in the pharmaceutical industry. The three-dimensional structure of the hERG channel was recently reported at 3.8-Å resolution using cryogenic electron microscopy (cryo-EM). However, the drug inhibition mechanism remains unclear because of the scarce structural information regarding the drug- and potassium-bound hERG channels. In this study, we obtained the cryo-EM density map of potassium-bound hERG channel complexed with astemizole, a well-known hERG inhibitor that increases risk of potentially fatal arrhythmia, at 3.5-Å resolution. The structure suggested that astemizole inhibits potassium conduction by binding directly below the selectivity filter. Furthermore, we propose a possible binding model of astemizole to the hERG channel and provide insights into the unusual sensitivity of hERG to several drugs.
History
DepositionJul 29, 2020-
Header (metadata) releaseJan 20, 2021-
Map releaseJan 20, 2021-
UpdateMar 27, 2024-
Current statusMar 27, 2024Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 5.5
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 5.5
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7cn1
  • Surface level: 5.5
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-7cn1
  • Imaged by Jmol
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Structure viewerEM map:
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Supplemental images

Downloads & links

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Map

FileDownload / File: emd_30413.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.884 Å
Density
Contour LevelBy AUTHOR: 5.5 / Movie #1: 5.5
Minimum - Maximum-26.047080999999999 - 37.109512000000002
Average (Standard dev.)-0.000000000001877 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 282.88 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8840.8840.884
M x/y/z320320320
origin x/y/z0.0000.0000.000
length x/y/z282.880282.880282.880
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ320320320
MAP C/R/S321
start NC/NR/NS000
NC/NR/NS320320320
D min/max/mean-26.04737.110-0.000

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Supplemental data

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Sample components

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Entire : potassium channel

EntireName: potassium channel
Components
  • Organelle or cellular component: potassium channel
    • Protein or peptide: potassium channel
  • Ligand: POTASSIUM IONPotassium

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Supramolecule #1: potassium channel

SupramoleculeName: potassium channel / type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: #1 / Details: homo-tetramer
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: potassium channel

MacromoleculeName: potassium channel / 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

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Macromolecule #2: POTASSIUM ION

MacromoleculeName: POTASSIUM ION / type: ligand / ID: 2 / Number of copies: 3 / Formula: K
Molecular weightTheoretical: 39.098 Da

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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

Concentration2 mg/mL
BufferpH: 7.4
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR / Details: The grid was washed by acetone prior to use.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 291 K / Instrument: FEI VITROBOT MARK IV / Details: Blotting time was 5 seconds (blot force 10).
DetailsThis sample was mono-disperse.

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 120000
Sample stageCooling holder cryogen: NITROGEN
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 1865 / Average exposure time: 55.55 sec. / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 930193
Startup modelType of model: OTHER
Details: An ab initio model was generated using RELION3's own implementation of Stochastic Gradient Descent (SGD) algorithm and low-pass filtered to 20 A for use as an initial model for 3D classification.
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final 3D classificationNumber classes: 196067 / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 102128
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-7cn1:
Cryo-EM structure of K+-bound hERG channel in the presence of astemizole

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