5TR1

Cryo-electron microscopy structure of a bovine CLC-K chloride channel, alternate (class 2) conformation


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.95 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.6 of the entry. See complete history


Literature

Structure of a CLC chloride ion channel by cryo-electron microscopy.

Park, E.Campbell, E.B.MacKinnon, R.

(2017) Nature 541: 500-505

  • DOI: https://doi.org/10.1038/nature20812
  • Primary Citation of Related Structures:  
    5TQQ, 5TR1

  • PubMed Abstract: 

    CLC proteins transport chloride (Cl - ) ions across cellular membranes to regulate muscle excitability, electrolyte movement across epithelia, and acidification of intracellular organelles. Some CLC proteins are channels that conduct Cl - ions passively, whereas others are secondary active transporters that exchange two Cl - ions for one H + . The structural basis underlying these distinctive transport mechanisms is puzzling because CLC channels and transporters are expected to share the same architecture on the basis of sequence homology. Here we determined the structure of a bovine CLC channel (CLC-K) using cryo-electron microscopy. A conserved loop in the Cl - transport pathway shows a structure markedly different from that of CLC transporters. Consequently, the cytosolic constriction for Cl - passage is widened in CLC-K such that the kinetic barrier previously postulated for Cl - /H + transporter function would be reduced. Thus, reduction of a kinetic barrier in CLC channels enables fast flow of Cl - down its electrochemical gradient.


  • Organizational Affiliation

    Laboratory of Molecular Neurobiology and Biophysics and Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, New York 10065, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chloride channel proteinA,
D [auth B]
671Bos taurusMutation(s): 1 
Gene Names: LOC101909378
Membrane Entity: Yes 
UniProt
Find proteins for E1B792 (Bos taurus)
Explore E1B792 
Go to UniProtKB:  E1B792
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE1B792
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Monoclonal antibody, Fab fragment, heavy chainB [auth H],
E [auth I]
113Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Monoclonal antibody, Fab fragment, light chainC [auth L],
F [auth M]
107Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.95 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTREFMAC5.8
RECONSTRUCTIONRELION1.4

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--
Jane Coffin Childs Memorial FundUnited States61-1513

Revision History  (Full details and data files)

  • Version 1.0: 2017-01-11
    Type: Initial release
  • Version 1.1: 2017-02-08
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence, Data collection, Experimental preparation
  • Version 1.3: 2018-07-18
    Changes: Data collection
  • Version 1.4: 2019-11-06
    Changes: Data collection, Other
  • Version 1.5: 2019-11-20
    Changes: Author supporting evidence
  • Version 1.6: 2024-10-23
    Changes: Data collection, Database references, Refinement description, Structure summary