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Intermolecular functional coupling between phosphoinositides and the potassium channel KcsA.

Takunari Kiya1, Kohei Takeshita2, Akira Kawanabe1

  • 1Laboratory of Molecular Physiology & Biophysics, Faculty of Medicine, Kagawa University, Miki-cho, Kagawa, Japan.

The Journal of Biological Chemistry
|July 15, 2022
PubMed
Summary
This summary is machine-generated.

Phosphoinositides (PIPns) significantly enhance KcsA K+ channel activity by directly binding to it. This study quantifies the relationship between PIPn binding and channel function, revealing charge-dependent modulation.

Keywords:
bilayer recordingelectrophysiologygatingphosphoinositidespotassium channelprotein–lipid interaction

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Area of Science:

  • Membrane biophysics
  • Ion channel function
  • Lipid-protein interactions

Background:

  • Biological membranes utilize diverse lipids, including phosphoinositides (PIPns), to regulate protein function.
  • PIPns modulate membrane proteins like ion channels, crucial for cell signaling.
  • KcsA, a well-studied K+ channel, is known to be influenced by phospholipids, but PIPn modulation remains unclear.

Purpose of the Study:

  • To quantitatively analyze the direct interaction between PIPns and the KcsA channel.
  • To determine if PIPns modulate KcsA channel function.
  • To investigate the correlation between PIPn charge and KcsA activity.

Main Methods:

  • Contact bubble bilayer recording to measure KcsA open probability.
  • Microscale thermophoresis to assess PIPn-KcsA binding affinity.
  • Electrophysiological analysis to evaluate channel activity.

Main Results:

  • KcsA open probability increased from ~10% to 90% with a small percentage of PIPns in the membrane.
  • Increased electrophysiological activity of KcsA correlated with higher negative charge on PIPns.
  • Strong correlation observed between direct PIPn binding and functional modification of KcsA.

Conclusions:

  • PIPns directly modify KcsA function, significantly increasing its open probability.
  • The degree of KcsA modulation by PIPns is dependent on the number of negative charges on the PIPns.
  • The developed approach can be used to study PIPn modulation of other ion channels.