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Correlation between structure and function in phosphatidylinositol lipid-dependent Kir2.2 gating.

Yuxi Zhang¹, Xiao Tao¹, Roderick MacKinnon¹

¹Laboratory of Molecular Neurobiology and Biophysics, HHMI, The Rockefeller University, New York, NY ,10065.

Proceedings of the National Academy of Sciences of the United States of America

|March 14, 2022

Summary

Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) regulates cell membrane voltage by controlling K+ channel activity. Phosphatidylinositol 4-phosphate (PI4P) competes with this lipid, suggesting a dual role in channel regulation.

Keywords:

PI(4)P PI(4,5)P2 inward rectifier phosphatidylinositol lipid single-channel analysis

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Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes

Published on: October 15, 2016

Area of Science:

Biochemistry
Cell Biology
Membrane Biophysics

Background:

Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) is a key signaling lipid in the plasma membrane.
PI(4,5)P2 plays a critical role in regulating ion channel function and cell membrane potential.
Phosphatidylinositol 4-phosphate (PI4P) is another abundant phosphoinositide that can be interconverted with PI(4,5)P2.

Purpose of the Study:

To investigate the regulatory role of PI(4,5)P2 in controlling K+ channel activity.
To explore the competitive interaction between PI(4,5)P2 and PI4P in modulating channel function.
To understand how the balance of these lipids affects cell membrane voltage.

Main Methods:

Utilizing electrophysiology to measure K+ channel activity.
Employing lipid-binding assays to assess protein-lipid interactions.
Biochemical approaches to manipulate phosphoinositide levels in cell membranes.

Main Results:

PI(4,5)P2 directly binds to and stabilizes the open state of a specific K+ channel.
PI(4,5)P2 acts as a molecular 'glue' that holds the channel subunits together.
PI4P antagonizes the action of PI(4,5)P2, preventing channel opening.

Conclusions:

PI(4,5)P2 is essential for regulating K+ channel gating and consequently cell membrane voltage.
The interplay between PI(4,5)P2 and PI4P provides a mechanism for fine-tuning channel activity.
These findings highlight the importance of phosphoinositide metabolism in cellular electrophysiology.