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Voltage-dependent gating at the KcsA selectivity filter.

Julio F Cordero-Morales1, Luis G Cuello, Eduardo Perozo

  • 1Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22906, USA.

Nature Structural & Molecular Biology
|March 15, 2006
PubMed
Summary
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The prokaryotic KcsA potassium channel exhibits voltage-dependent gating, crucial for its function. Researchers found that charge movement, specifically involving Glu71, underlies this voltage sensitivity, independent of proton activation.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Ion Channel Function

Background:

  • The KcsA potassium channel, despite lacking a typical voltage-sensing domain, displays voltage-dependent gating.
  • This gating mechanism significantly influences the channel's open probability across a wide voltage range.

Purpose of the Study:

  • To elucidate the molecular mechanism underlying the voltage-dependent gating of the KcsA potassium channel.
  • To investigate the role of charge movement and specific residues in KcsA channel gating.

Main Methods:

  • Electrophysiological recordings to assess channel gating.
  • Site-directed mutagenesis to alter specific amino acid residues (e.g., Glu71).
  • Analysis of charge movement associated with voltage-dependent conformational changes.

Related Experiment Videos

Main Results:

  • Voltage-dependent gating in KcsA involves the movement of approximately 0.7 electronic charges.
  • This charge movement enhances the rate of entry into a long-lived inactivated state.
  • Neutralizing charge at position 71 (Glu71) resulted in a voltage-independent channel, preventing inactivation.

Conclusions:

  • The voltage-dependent gating of KcsA is mediated by charge movement at the selectivity filter, independent of proton activation.
  • The reorientation of the Glu71 carboxylic moiety is proposed as a key factor in the conformational dynamics governing KcsA voltage gating.