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Related Experiment Videos

Proton sensing of CLC-0 mutant E166D.

Sonia Traverso1, Giovanni Zifarelli, Rita Aiello

  • 1Istituto di Biofisica, Consiglio Nazionale della Ricerche, Genova, Italy.

The Journal of General Physiology
|December 29, 2005
PubMed
Summary

Mutations in CLC-0 channels at glutamate 166 (E166) alter fast and slow gating mechanisms. The E166D mutation reveals distinct open states with varying conductance, influenced by protonation.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Ion Channel Physiology

Background:

  • Chloride (Cl-) channels are crucial for cellular function, often existing as homodimers with distinct gating mechanisms.
  • A conserved glutamate (E166 in CLC-0) is a key determinant of CLC channel gating and Cl-/H+ antiport activity.

Purpose of the Study:

  • To investigate the role of glutamate 166 (E166) in CLC-0 channel gating by creating tandem dimers with E166A and E166D mutations.
  • To determine how these mutations affect fast and slow gating properties and the channel's ion transport characteristics.

Main Methods:

  • Construction of tandem dimers with one wild-type (WT) and one mutant (E166A or E166D) CLC-0 subunit.
  • Electrophysiological recordings to analyze channel open probability (popen), gating kinetics, and ion currents under varying voltage and pH conditions.

Main Results:

  • E166A and E166D mutations specifically affect the fast gate of their own pore, not the adjacent one, and activate the slow gate.
  • E166A exhibits high, voltage-independent fast gate popen; E166D shows reduced popen, sensitive to intracellular pH (pHint).
  • E166D displays a persistent inward current at negative voltages, blocked by CPA and dependent on extracellular pH (pHext), with a significantly lower unitary conductance than WT.

Conclusions:

  • The E166 residue is critical for regulating fast gating and influences slow gate activation in CLC-0 channels.
  • The E166D mutation allows the channel to adopt at least two distinct open states with different conductances, modulated by protonation.
  • These findings provide insights into the complex gating mechanisms and ion transport properties of CLC channels.

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