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Regulation of lipid saturation without sensing membrane fluidity
Stephanie Ballweg1,2, Erdinc Sezgin3, Milka Doktorova4
1Medical Biochemistry and Molecular Biology, Medical Faculty, Saarland University, Kirrberger Strasse 100, Building 61.4, 66421, Homburg, Germany.
Nature Communications
|February 8, 2020
Summary
Cells adapt membrane fluidity by sensing lipid packing density, not fluidity itself. This discovery reveals how Mga2 (membrane-associated protein) detects specific lipid structures, challenging current models of homeoviscous adaptation.
Area of Science:
- Cellular Biology
- Biophysics
- Molecular Mechanisms
Background:
- Cells regulate membrane fluidity through lipid saturation for optimal function.
- The precise molecular mechanisms of homeoviscous adaptation are not fully understood.
Purpose of the Study:
- To elucidate the molecular mechanism of lipid saturation regulation in baker's yeast.
- To investigate the sensing capabilities of the Mga2 transcriptional regulator.
Main Methods:
- Reconstitution of the core machinery for lipid saturation regulation.
- Combination of molecular dynamics simulations and experimental approaches.
- Analysis of Mga2 sensitivity to lipid acyl chain properties.
Main Results:
- Mga2 exhibits high sensitivity to lipid double bond abundance, position, and configuration.
- Challenged the hypothesis that membrane fluidity is the primary sensed variable.
- Demonstrated that Mga2 senses molecular lipid-packing density in specific membrane regions.
Conclusions:
- Cells regulate lipid saturation by sensing lipid packing density, not fluidity directly.
- Mga2 acts as a specific sensor for membrane structural properties.
- Findings suggest evolved sensitivities in membrane property sensors and potential for new reporter development.
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