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Rho3p regulates cell separation by modulating exocyst function in Schizosaccharomyces pombe
Hongyan Wang1, Xie Tang, Mohan K Balasubramanian
1Temasek Life Sciences Laboratory, National University of Singapore, Singapore 117604, Republic of Singapore.
Genetics
|August 22, 2003
Summary
The Rho3 GTPase in fission yeast regulates cell separation by modulating the exocyst complex, essential for cytokinesis. This discovery sheds light on the final stages of cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Cytokinesis is the final stage of cell division, physically separating a mother cell into two daughters.
- The fission yeast *Schizosaccharomyces pombe* is a model organism for studying cytokinesis, involving an actomyosin ring and septum formation.
- The exocyst complex is crucial for the final septum digestion step in *S. pombe* cytokinesis.
Purpose of the Study:
- To identify genes that regulate the exocyst complex function in *Schizosaccharomyces pombe* cytokinesis.
- To investigate the role of Rho3 GTPase in cell separation and its relationship with the exocyst complex.
Main Methods:
- Genetic screening using a temperature-sensitive exocyst mutant (*sec8-1*).
- Isolation and characterization of suppressor genes, including *rho3*(+).
- Phenotypic analysis of *rho3* deletion mutants (*rho3*Δ) and exocyst mutants.
Main Results:
- *rho3*(+) was identified as a high-copy suppressor of *sec8-1* and Exo70p deletion mutants.
- *rho3*Δ cells exhibit cell division defects, including multinucleation and uncleaved septa, similar to exocyst mutants.
- *rho3*Δ cells accumulate vesicle-like structures, suggesting a role in membrane trafficking during cytokinesis.
Conclusions:
- Rho3 GTPase likely modulates exocyst complex function during *S. pombe* cytokinesis.
- Rho3p plays a critical role in regulating cell separation by influencing exocyst-mediated processes.