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Area of Science:

  • Molecular and Cellular Biology
  • Neuroscience
  • Biophysics

Background:

  • Voltage-activated ion channels, particularly potassium (Kv) channels, are crucial for electrical and chemical signaling.
  • The precise structural basis of voltage sensing in these channels remains largely unknown.
  • Hanatoxin, a tarantula toxin, is known to inhibit Kv channels by binding to voltage-sensor paddles.

Purpose of the Study:

  • To investigate the kinetics and state dependence of the hanatoxin-Kv channel interaction.
  • To determine the physical location of hanatoxin within the cell membrane during channel interaction.
  • To elucidate the role of hanatoxin binding in Kv channel gating and voltage sensing.

Main Methods:

  • Analysis of toxin-channel interaction kinetics and voltage-dependence.
  • Determination of toxin localization within lipid bilayers using biophysical techniques.
  • Characterization of the stability of the toxin-channel complex during channel conformational changes.

Main Results:

  • Hanatoxin forms a stable and long-lasting complex with Kv channel voltage sensors.
  • Toxin binding affinity decreases upon voltage-sensor activation, explaining stabilization of the resting state.
  • Hanatoxin localizes to the membrane interfacial region, with key residues positioned near the bilayer center.
  • Voltage-sensor paddles move with the bound toxin, suggesting limited traversal of the bilayer during activation.

Conclusions:

  • Hanatoxin acts as a stable cargo during voltage-sensor paddle activation.
  • Kv channel voltage sensors likely traverse only the outer half of the lipid bilayer during gating.
  • The study provides structural insights into the mechanism of voltage sensing in Kv channels.