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- EMDB-4657: CryoEM structure of the human ClC-1 chloride channel, low pH -

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Basic information

Entry
Database: EMDB / ID: EMD-4657
TitleCryoEM structure of the human ClC-1 chloride channel, low pH
Map data
Sample
  • Complex: human Chloride Channel protein 1
    • Protein or peptide: Chloride channel protein 1
Function / homology
Function and homology information


voltage-gated chloride channel activity / neuronal action potential propagation / chloride transport / chloride channel complex / chloride transmembrane transport / muscle contraction / sarcolemma / Stimuli-sensing channels / protein homodimerization activity / plasma membrane
Similarity search - Function
Chloride channel ClC-1 / Chloride channel, voltage gated / Chloride channel, core / Voltage gated chloride channel / CBS domain superfamily / CBS domain profile.
Similarity search - Domain/homology
Chloride channel protein 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.2 Å
AuthorsWang KT / Gourdon PE / Zhou ZH
Funding support Denmark, 1 items
OrganizationGrant numberCountry
Danish Council for Independent Research4092-00228 Denmark
CitationJournal: PLoS Biol / Year: 2019
Title: Structure of the human ClC-1 chloride channel.
Authors: Kaituo Wang / Sarah Spruce Preisler / Liying Zhang / Yanxiang Cui / Julie Winkel Missel / Christina Grønberg / Kamil Gotfryd / Erik Lindahl / Magnus Andersson / Kirstine Calloe / Pascal F ...Authors: Kaituo Wang / Sarah Spruce Preisler / Liying Zhang / Yanxiang Cui / Julie Winkel Missel / Christina Grønberg / Kamil Gotfryd / Erik Lindahl / Magnus Andersson / Kirstine Calloe / Pascal F Egea / Dan Arne Klaerke / Michael Pusch / Per Amstrup Pedersen / Z Hong Zhou / Pontus Gourdon /
Abstract: ClC-1 protein channels facilitate rapid passage of chloride ions across cellular membranes, thereby orchestrating skeletal muscle excitability. Malfunction of ClC-1 is associated with myotonia ...ClC-1 protein channels facilitate rapid passage of chloride ions across cellular membranes, thereby orchestrating skeletal muscle excitability. Malfunction of ClC-1 is associated with myotonia congenita, a disease impairing muscle relaxation. Here, we present the cryo-electron microscopy (cryo-EM) structure of human ClC-1, uncovering an architecture reminiscent of that of bovine ClC-K and CLC transporters. The chloride conducting pathway exhibits distinct features, including a central glutamate residue ("fast gate") known to confer voltage-dependence (a mechanistic feature not present in ClC-K), linked to a somewhat rearranged central tyrosine and a narrower aperture of the pore toward the extracellular vestibule. These characteristics agree with the lower chloride flux of ClC-1 compared with ClC-K and enable us to propose a model for chloride passage in voltage-dependent CLC channels. Comparison of structures derived from protein studied in different experimental conditions supports the notion that pH and adenine nucleotides regulate ClC-1 through interactions between the so-called cystathionine-β-synthase (CBS) domains and the intracellular vestibule ("slow gating"). The structure also provides a framework for analysis of mutations causing myotonia congenita and reveals a striking correlation between mutated residues and the phenotypic effect on voltage gating, opening avenues for rational design of therapies against ClC-1-related diseases.
History
DepositionMar 5, 2019-
Header (metadata) releaseMay 8, 2019-
Map releaseMay 8, 2019-
UpdateDec 18, 2019-
Current statusDec 18, 2019Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.027
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.027
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6qvu
  • Surface level: 0.027
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_4657.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.07 Å
Density
Contour LevelBy AUTHOR: 0.02 / Movie #1: 0.027
Minimum - Maximum-0.026119454 - 0.07093831
Average (Standard dev.)0.00015516167 (±0.0026731177)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 308.16 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z288288288
origin x/y/z0.0000.0000.000
length x/y/z308.160308.160308.160
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS288288288
D min/max/mean-0.0260.0710.000

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Supplemental data

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Additional map: #1

Fileemd_4657_additional.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Half map: #2

Fileemd_4657_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Half map: #1

Fileemd_4657_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

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Sample components

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Entire : human Chloride Channel protein 1

EntireName: human Chloride Channel protein 1
Components
  • Complex: human Chloride Channel protein 1
    • Protein or peptide: Chloride channel protein 1

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Supramolecule #1: human Chloride Channel protein 1

SupramoleculeName: human Chloride Channel protein 1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 109 KDa

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Macromolecule #1: Chloride channel protein 1

MacromoleculeName: Chloride channel protein 1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 108.733172 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae (brewer's yeast)
SequenceString: MEQSRSQQRG GEQSWWGSDP QYQYMPFEHC TSYGLPSENG GLQHRLRKDA GPRHNVHPTQ IYGHHKEQFS DREQDIGMPK KTGSSSTVD SKDEDHYSKC QDCIHRLGQV VRRKLGEDGI FLVLLGLLMA LVSWSMDYVS AKSLQAYKWS YAQMQPSLPL Q FLVWVTFP ...String:
MEQSRSQQRG GEQSWWGSDP QYQYMPFEHC TSYGLPSENG GLQHRLRKDA GPRHNVHPTQ IYGHHKEQFS DREQDIGMPK KTGSSSTVD SKDEDHYSKC QDCIHRLGQV VRRKLGEDGI FLVLLGLLMA LVSWSMDYVS AKSLQAYKWS YAQMQPSLPL Q FLVWVTFP LVLILFSALF CHLISPQAVG SGIPEMKTIL RGVVLKEYLT MKAFVAKVVA LTAGLGSGIP VGKEGPFVHI AS ICAAVLS KFMSVFCGVY EQPYYYSDIL TVGCAVGVGC CFGTPLGGVL FSIEVTSTYF AVRNYWRGFF AATFSAFVFR VLA VWNKDA VTITALFRTN FRMDFPFDLK ELPAFAAIGI CCGLLGAVFV YLHRQVMLGV RKHKALSQFL AKHRLLYPGI VTFV IASFT FPPGMGQFMA GELMPREAIS TLFDNNTWVK HAGDPESLGQ SAVWIHPRVN VVIIIFLFFV MKFWMSIVAT TMPIP CGGF MPVFVLGAAF GRLVGEIMAM LFPDGILFDD IIYKILPGGY AVIGAAALTG AVSHTVSTAV ICFELTGQIA HILPMM VAV ILANMVAQSL QPSLYDSIIQ VKKLPYLPDL GWNQLSKYTI FVEDIMVRDV KFVSASYTYG ELRTLLQTTT VKTLPLV DS KDSMILLGSV ERSELQALLQ RHLCPERRLR AAQEMARKLS ELPYDGKARL AGEGLPGAPP GRPESFAFVD EDEDEDLS G KSELPPSLAL HPSTTAPLSP EEPNGPLPGH KQQPEAPEPA GQRPSIFQSL LHCLLGRARP TKKKTTQDST DLVDNMSPE EIEAWEQEQL SQPVCFDSCC IDQSPFQLVE QTTLHKTHTL FSLLGLHLAY VTSMGKLRGV LALEELQKAI EGHTKSGVQL RPPLASFRN TTSTRKSTGA PPSSAENWNL PEDRPGATGT GDVIAASPET PVPSPSPEPP LSLAPGKVEG ELEELELVES P GLEEELAD ILQGPSLRST DEEDEDELIL

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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

Concentration0.6 mg/mL
BufferpH: 7.5 / Component - Concentration: 20.0 mM / Component - Name: BisTris / Details: 20mM BisTrisTris ph6.2 100mM NaCl 0.2mM TCEP
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 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: 70.0 µm / Illumination mode: OTHER / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm
Specialist opticsEnergy filter - Slit width: 20 eV
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average exposure time: 9.0 sec. / Average electron dose: 45.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 853486
CTF correctionSoftware - Name: Gctf
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.0)
Final 3D classificationNumber classes: 5 / Software - Name: RELION (ver. 2.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.0)
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C2 (2 fold cyclic) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.0) / Number images used: 125432
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:
RefinementSpace: REAL / Protocol: BACKBONE TRACE
Output model

PDB-6qvu:
CryoEM structure of the human ClC-1 chloride channel, low pH

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