CryoEM structure of the human ClC-1 chloride channel, CBS state 1

Experimental Data Snapshot

  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Structure of the human ClC-1 chloride channel.

Wang, K.Preisler, S.S.Zhang, L.Cui, Y.Missel, J.W.Gronberg, C.Gotfryd, K.Lindahl, E.Andersson, M.Calloe, K.Egea, P.F.Klaerke, D.A.Pusch, M.Pedersen, P.A.Zhou, Z.H.Gourdon, P.

(2019) PLoS Biol 17: e3000218-e3000218

  • DOI: https://doi.org/10.1371/journal.pbio.3000218
  • Primary Citation of Related Structures:  
    6QV6, 6QVB, 6QVC, 6QVD, 6QVU

  • PubMed 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 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.

  • Organizational Affiliation

    Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chloride channel protein 1A [auth B],
B [auth A]
988Homo sapiensMutation(s): 0 
Gene Names: CLCN1CLC1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P35523 (Homo sapiens)
Explore P35523 
Go to UniProtKB:  P35523
PHAROS:  P35523
GTEx:  ENSG00000188037 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35523
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Danish Council for Independent ResearchDenmark4092-00228

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-08
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Other