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Updated: Mar 19, 2026

Measuring Membrane Lipid Turnover with the pH-sensitive Fluorescent Lipid Analog ND6

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Published on: July 29, 2021

A Eukaryotic Sensor for Membrane Lipid Saturation.

Roberto Covino¹, Stephanie Ballweg², Claudius Stordeur²

¹Department of Theoretical Biophysics, Max-Planck-Institute of Biophysics, 60438 Frankfurt, Germany.

|June 21, 2016

Summary

This summary is machine-generated.

Mga2 acts as a lipid-packing sensor in the ER membrane, controlling unsaturated fatty acid production. This eukaryotic mechanism senses lipid saturation via its transmembrane helix, differing from bacterial methods.

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Published on: January 4, 2016

Area of Science:

Cell Biology
Biochemistry
Molecular Biology

Background:

Cell membrane fluidity, regulated by lipid saturation, is vital for cellular functions like signaling and survival.
Maintaining proper organelle function requires tight control over lipid saturation and membrane properties.
A specific eukaryotic mechanism for sensing lipid saturation has not been identified.

Purpose of the Study:

To identify and characterize the eukaryotic mechanism for sensing lipid saturation in the endoplasmic reticulum (ER) membrane.
To elucidate the role of the transcription factor Mga2 in lipid saturation sensing and its impact on fatty acid production.

Main Methods:

Systematic mutagenesis of Mga2.
Molecular dynamics simulations.
Electron paramagnetic resonance (EPR) spectroscopy.

Main Results:

Mga2 functions as a lipid-packing sensor in the ER membrane.
The transmembrane helix (TMH) of Mga2 is crucial for sensing the lipid environment.
The lipid environment influences Mga2 activation by stabilizing TMH rotational orientations.
Mga2 controls the production of unsaturated fatty acids.

Conclusions:

This study reveals a novel eukaryotic mechanism for lipid saturation sensing mediated by Mga2.
The identified mechanism relies on intra-membrane sensing by Mga2's TMH, distinct from bacterial hydrophobic thickness sensing.
This finding provides insights into organelle identity and function regulation.