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Related Experiment Videos

A GTP-exchange factor required for cell orientation

A Nern1, R A Arkowitz

  • 1Division of Cell Biology, MRC Laboratory of Molecular Biology, Cambridge, UK.

Nature
|January 15, 1998
PubMed
Summary

Budding yeast mating requires Cdc24 binding to G-protein betagamma subunits for directional growth. This study identifies specific cdc24 mutations disrupting this interaction, revealing a key link between signaling and cell polarization.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Rho-family GTPases regulate cytoskeletal dynamics and gene expression.
  • The link between membrane receptors and Rho GTPases is poorly understood.
  • In Saccharomyces cerevisiae, mating involves G-protein-coupled receptors and polarized growth.

Purpose of the Study:

  • Investigate the role of the Rho-family GTPase Cdc42 and its exchange factor Cdc24 in yeast mating.
  • Identify specific molecular interactions mediating directional cell growth during mating.

Main Methods:

  • Isolation and characterization of cdc24 mutant alleles.
  • Analysis of cell cycle arrest, transcriptional activation, and cell polarization in response to mating pheromone.
  • Assessment of actin cytoskeleton organization and mating projection orientation.
  • Examination of Cdc24 binding to G-protein betagamma subunits.

Main Results:

  • Identified cdc24 mutants that arrest and polarize but fail to orient towards pheromone.
  • These mutants exhibit defects in Cdc24 binding to the G-protein betagamma subunit.
  • Demonstrated that this association is crucial for directed cell growth during mating.

Conclusions:

  • The association between Cdc24 and the G-protein betagamma subunit is essential for linking receptor-mediated signaling to oriented cell growth in yeast.
  • This interaction provides a critical mechanism for directional polarization during mating.

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