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Related Experiment Videos

Ion conduction through C-type inactivated Shaker channels

J G Starkus1, L Kuschel, M D Rayner

  • 1Research Unit Molecular and Cellular Biophysics, Max Planck Society, D-07747 Jena, Germany.

The Journal of General Physiology
|November 14, 1997
PubMed
Summary

Shaker potassium channels exhibit C-type inactivation, appearing nonconducting. However, removing internal potassium ions reveals ion conduction in these inactivated states, suggesting altered channel properties.

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Area of Science:

  • Molecular biology
  • Ion channel physiology

Background:

  • Shaker potassium channels are crucial for neuronal excitability.
  • C-type inactivation is a key mechanism regulating channel function.
  • Previous studies suggested channels become nonconducting upon C-type inactivation.

Purpose of the Study:

  • To investigate ion conduction through C-type inactivated states of Shaker potassium channels.
  • To elucidate the mechanisms underlying the nonconducting appearance of C-type inactivated channels.

Main Methods:

  • Utilizing Xenopus oocytes for channel expression.
  • Employing inside-out patch-clamp recordings.
  • Manipulating internal ion concentrations (K+, Na+, Li+).

Main Results:

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  • C-type inactivated Shaker channels permit Na+ and Li+ conduction when internal K+ is removed.
  • Both activation and deactivation kinetics are slowed in C-type inactivated states.
  • Internal K+ ions block Na+ permeation, and C-type inactivation reduces K+ permeability relative to Na+.

Conclusions:

  • C-type inactivation does not completely abolish channel function but alters ion selectivity.
  • The nonconducting state in physiological solutions results from ion blocking and reduced K+ permeability.
  • Understanding these mechanisms provides insights into ion channel gating and selectivity.