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Analysis of Lipid Droplet Content in Fission and Budding Yeasts using Automated Image Processing
Published on: July 17, 2019
Lipid storage and mobilization pathways in yeast.
Günther Daum1, Andrea Wagner, Tibor Czabany
1Institute of Biochemisty, Graz University of Technology, Petersgasse 12/2, A-8010 Graz, Austria.
Novartis Foundation Symposium
|February 14, 2008
Summary
This study uses yeast to explore neutral lipid metabolism, identifying key enzymes for synthesis and breakdown. Findings reveal distinct cellular locations for these processes, impacting lipid regulation.
Area of Science:
- Lipid biochemistry and metabolism
- Cellular and molecular biology
- Yeast as a model organism
Background:
- Understanding neutral lipid pathways (triacylglycerol and steryl ester) is crucial in biochemistry and cell biology.
- The yeast Saccharomyces cerevisiae is a powerful model for studying complex lipid metabolism.
Purpose of the Study:
- To investigate neutral lipid synthesis, storage, and mobilization pathways in yeast.
- To identify the major gene products and enzymes involved in these lipid metabolic processes.
Main Methods:
- Utilizing Saccharomyces cerevisiae as a model system.
- Investigating the roles of specific enzymes like Are1p, Are2p, Dgalp, Lro1p, Tgl3p, Tgl4p, Tgl5p, Tgl1p, Yeh1p, and Yeh2p.
- Analyzing the subcellular localization of enzymes and lipid storage compartments (lipid particles).
Main Results:
- Identified Are1p and Are2p as steryl ester synthases.
- Identified Dgalp and Lro1p as major triacylglycerol synthesis enzymes.
- Demonstrated that neutral lipids are stored in lipid particles and mobilization involves specific lipases and hydrolases.
- Revealed distinct subcellular localizations for synthesis (endoplasmic reticulum, lipid particles) and mobilization enzymes.
Conclusions:
- Enzymatic steps in triacylglycerol and steryl ester metabolism occur in different cellular compartments.
- Regulation of neutral lipid metabolism involves both enzymatic activity and organelle-level control.
- Yeast provides a valuable system for dissecting the compartmentalization of lipid metabolism.
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