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Analysis of Lipid Droplet Content in Fission and Budding Yeasts using Automated Image Processing
Published on: July 17, 2019
Yeast lipids can phase-separate into micrometer-scale membrane domains.
Christian Klose1, Christer S Ejsing, Ana J García-Sáez
1Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany.
The Journal of Biological Chemistry
|July 22, 2010
Summary
Yeast cell membranes can self-organize into functional domains. Specific interactions between sphingolipids and ergosterol drive this membrane domain formation, explaining lipid raft-dependent sorting in yeast.
Area of Science:
- Cell Biology
- Biochemistry
- Membrane Biophysics
Background:
- Biological membranes form functional domains, known as lipid rafts.
- Lipid rafts are involved in cellular signaling and protein/lipid sorting.
- Evidence for yeast lipid raft formation is limited, lacking direct interaction data.
Purpose of the Study:
- To investigate the self-organization potential of yeast total lipid extracts.
- To determine the role of yeast sphingolipids and ergosterol in membrane domain formation.
- To provide a mechanistic explanation for lipid raft-dependent sorting in Saccharomyces cerevisiae.
Main Methods:
- Formation of model membranes using yeast total lipid extracts.
- Analysis of lipid extracts from sphingolipid metabolism mutants.
- Reconstitution of purified yeast lipids in defined model membranes.
Main Results:
- Yeast total lipid extracts self-organize into liquid-disordered and liquid-ordered phases at physiological temperatures.
- Membrane domain formation is dependent on specific interactions between yeast sphingolipids and ergosterol.
- Mutant analysis and lipid reconstitution confirmed the role of sphingolipid-ergosterol interactions.
Conclusions:
- Yeast membranes possess inherent self-organization capabilities.
- Specific sphingolipid-ergosterol interactions are crucial for yeast membrane domain formation.
- This study provides a mechanistic basis for lipid raft function in yeast.
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