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Related Experiment Videos

Cell surface polarization during yeast mating.

Michel Bagnat1, Kai Simons

  • 1Max Planck Institute for Molecular Cell Biology and Genetics, 01307 Dresden, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|October 11, 2002
PubMed
Summary
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Yeast cells use specialized membrane domains to direct mating proteins to the cell tip. This lipid raft reorganization is crucial for cell polarization and successful mating.

Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Haploid Saccharomyces cerevisiae cells exhibit cell cycle arrest, mating gene expression, and polarized growth upon pheromone exposure.
  • Proteins essential for mating, signaling, and cell fusion localize to the mating projection tip (shmoo).
  • Mechanisms for precise protein targeting and retention at the shmoo tip are not well understood.

Purpose of the Study:

  • To investigate the role of plasma membrane reorganization and lipid rafts in protein localization during yeast mating.
  • To understand how membrane microdomains contribute to polarity maintenance in mating cells.

Main Methods:

  • Analysis of protein localization in pheromone-treated Saccharomyces cerevisiae cells.
  • Investigation of lipid raft involvement using sphingolipid and ergosterol biosynthetic mutants.

Related Experiment Videos

Main Results:

  • Pheromone treatment induces plasma membrane reorganization, forming lipid rafts that retain mating proteins at the shmoo tip.
  • These lipid rafts segregate proteins from the bulk plasma membrane.
  • Mutants defective in sphingolipid or ergosterol biosynthesis show impaired protein polarization and mating deficiency.

Conclusions:

  • Membrane microdomain clustering within lipid rafts is essential for generating and maintaining cell polarity during yeast mating.
  • Lipid rafts play a critical role in the targeted delivery and retention of mating proteins.
  • Disruption of lipid raft formation or function severely impairs the mating process in Saccharomyces cerevisiae.