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Related Experiment Videos

Structure and function of clc channels.

Tsung-Yu Chen1

  • 1Center for Neuroscience and Department of Neurology, University of California, Davis, California 95616, USA. tycchen@ucdavis.edu

Annual Review of Physiology
|February 16, 2005
PubMed
Summary
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The CLC family proteins translocate chloride ions. Bacterial CLC structures reveal dual pores and gating-permeation coupling, but the functional difference between channels and transporters remains a challenge.

Area of Science:

  • Molecular biology
  • Structural biology
  • Biophysics

Background:

  • The CLC family consists of integral membrane proteins crucial for chloride ion transport across cell membranes.
  • Previous understanding of CLC channels relied heavily on electrophysiological studies of vertebrate muscle-type CLC channels.
  • Recent structural determination of bacterial CLC orthologues offers new insights into their mechanisms.

Purpose of the Study:

  • To provide a structural framework for understanding CLC protein operating mechanisms.
  • To investigate the gating-permeation coupling mechanism in CLC channels.
  • To address the challenge of distinguishing between CLC ion channels and transporters.

Main Methods:

  • X-ray crystallography of bacterial CLC orthologues (Salmonella typhimurium and Escherichia coli).

Related Experiment Videos

  • Electrophysiological studies of vertebrate muscle-type CLC channels.
  • Comparative structural and functional analysis.

    • Main Results:

    • Bacterial CLC structures confirm the presence of two identical, independent pores, consistent with predictions for vertebrate CLC channels.
    • The solved structures provide a model for explaining the gating-permeation coupling mechanism.
    • Recent findings indicate CLC-ec1 functions as a Cl-/H+ antiporter, not an ion channel, highlighting functional diversity.

    Conclusions:

    • Bacterial CLC structures serve as valuable models for understanding CLC channel function, including gating-permeation coupling.
    • The molecular basis for the functional divergence between CLC ion channels and transporters remains an open question.
    • Further structure/function studies are needed to elucidate the CLC family's diverse roles.