CLC-ec1 R230C/L249C/C85A at pH 4.5 100mM Cl Turn

Experimental Data Snapshot

  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

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Structural basis of pH-dependent activation in a CLC transporter.

Fortea, E.Lee, S.Chadda, R.Argyros, Y.Sandal, P.Mahoney-Kruszka, R.Ciftici, D.Falzone, M.E.Huysmans, G.Robertson, J.L.Boudker, O.Accardi, A.

(2024) Nat Struct Mol Biol 

  • DOI: https://doi.org/10.1038/s41594-023-01210-5
  • Primary Citation of Related Structures:  
    8GA0, 8GA1, 8GA3, 8GA5, 8GAH

  • PubMed Abstract: 

    CLCs are dimeric chloride channels and anion/proton exchangers that regulate processes such as muscle contraction and endo-lysosome acidification. Common gating controls their activity; its closure simultaneously silences both protomers, and its opening allows them to independently transport ions. Mutations affecting common gating in human CLCs cause dominant genetic disorders. The structural rearrangements underlying common gating are unknown. Here, using single-particle cryo-electron microscopy, we show that the prototypical Escherichia coli CLC-ec1 undergoes large-scale rearrangements in activating conditions. The slow, pH-dependent remodeling of the dimer interface leads to the concerted opening of the intracellular H + pathways and is required for transport. The more frequent formation of short water wires in the open H + pathway enables Cl - pore openings. Mutations at disease-causing sites favor CLC-ec1 activation and accelerate common gate opening in the human CLC-7 exchanger. We suggest that the pH activation mechanism of CLC-ec1 is related to the common gating of CLC-7.

  • Organizational Affiliation

    Department of Physiology and Biophysics, Weill Cornell Medical School, New York, NY, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
H(+)/Cl(-) exchange transporter ClcA
A, B
461Escherichia coliMutation(s): 3 
Gene Names: yadQ
Find proteins for J7Q633 (Escherichia coli)
Explore J7Q633 
Go to UniProtKB:  J7Q633
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupJ7Q633
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM128420

Revision History  (Full details and data files)

  • Version 1.0: 2024-02-07
    Type: Initial release