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Related Experiment Videos

Spatial localization of the K+ channel selectivity filter by mutant cycle-based structure analysis

R Ranganathan1, J H Lewis, R MacKinnon

  • 1Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA.

Neuron
|January 1, 1996
PubMed
Summary

Scorpion toxin Agitoxin2 blocks Shaker K+ channels. This study maps key channel residues, revealing a shallow vestibule and the selectivity filter

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Area of Science:

  • Molecular biology
  • Biophysics
  • Ion channel function

Background:

  • Shaker K+ channels are crucial for neuronal electrical signaling.
  • Scorpion toxins, like Agitoxin2, are valuable tools for probing channel structure and function.
  • Understanding toxin-channel interactions aids in deciphering ion permeation mechanisms.

Purpose of the Study:

  • To structurally map the interaction interface between Agitoxin2 and Shaker K+ channels.
  • To identify specific channel residues involved in toxin binding and ion selectivity.
  • To elucidate the architecture of the K+ channel entryway.

Main Methods:

  • Scanning mutagenesis of Shaker K+ channel.
  • Thermodynamic mutant cycle analysis.
  • Characterization of toxin-inhibitor interactions.

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Main Results:

  • Identified critical inhibitor residues on Agitoxin2 and corresponding channel residues.
  • Mapped multiple channel residues within the pore-forming loops to the toxin interaction surface.
  • Discovered a unique K+ concentration-dependent interaction between Agitoxin2 (K27M) and Shaker K+ channel (Y445F).
  • Revealed a shallow vestibule at the channel entryway, with the selectivity filter near the extracellular solution.

Conclusions:

  • The pore loops form a shallow vestibule at the K+ channel entryway.
  • The selectivity filter is positioned centrally within this vestibule, close to the external solution.
  • Detailed structural mapping provides insights into ion selectivity and toxin modulation of K+ channels.