The long pathway to cell organization and growth
- Date:
- May 15, 2025
- Source:
- University of California - San Diego
- Summary:
- Sterols are among the most abundant lipids in eukaryotic cells, yet are synthesized through notoriously long, complex metabolic pathways. Researchers have used a novel approach to show how they interact with other lipids that help cells self-organize.
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Sterols, such as cholesterol in our bodies or ergosterol in yeast cells, are among the most abundant lipids in eukaryotic cells, yet are synthesized through notoriously long, complex metabolic pathways. Researchers from UC San Diego and the NIH have used a novel combination of cell biology, in vitro biochemistry and molecular computer simulations to show that in yeast, this pathway shapes the ergosterol to balance its interactions with other lipids. This balancing act allows for the formation of membrane domains -- self-assembling structures that are believed to organize proteins in cell membranes.
The work tests and revises a 50-year old textbook model, known as the Bloch hypothesis, for the evolution of sterol metabolism in eukaryotic cells. The results indicate that the complexity of sterol metabolism could have resulted from the need to balance lipid interactions required for membrane organization
"This has been one of my favorite projects," stated Assistant Professor of Chemistry and Biochemistry Itay Budin. "It taught me so much about sterols, their metabolism, and the hoops cells go through to make their lipids dance in just the right way."
Their research was funded by the National Institutes of Health (GM142960, T32-GM008326C), the National Science Foundation (MCB-2046303) and the Department of Energy (DE-SC0022954).
Story Source:
Materials provided by University of California - San Diego. Original written by Michelle Franklin. Note: Content may be edited for style and length.
Journal Reference:
- Israel Juarez-Contreras, Laura J. S. Lopes, Jamie Holt, Lorena Yu-Liao, Katherine O’Shea, Jose Ruiz-Ruiz, Alexander Sodt, Itay Budin. Structural dissection of ergosterol metabolism reveals a pathway optimized for membrane phase separation. Science Advances, 2025; 11 (17) DOI: 10.1126/sciadv.adu7190
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