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Related Experiment Videos

Functional overlap of the dictyostelium RasG, RasD and RasB proteins.

M Khosla1, G B Spiegelman, R Insall

  • 1Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.

Journal of Cell Science
|March 22, 2000
PubMed
Summary

Disrupting the rasG gene in Dictyostelium discoideum causes defects in cell division, motility, and growth. Other Ras genes, rasD and rasB, partially rescue these phenotypes, indicating RasG regulates multiple pathways.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • The rasG gene in Dictyostelium discoideum is crucial for normal cellular functions.
  • Disruption of rasG leads to defects in cytokinesis, motility, and growth.

Purpose of the Study:

  • To investigate the role of RasG in regulating downstream effectors.
  • To determine if other Dictyostelium ras genes (rasD, rasB) can rescue rasG null cell defects.

Main Methods:

  • Gene disruption and reintroduction of rasG, rasD, and rasB genes.
  • Analysis of cellular phenotypes (cytokinesis, motility, growth).
  • Western blot analysis to determine protein levels of RasD and RasB.

Main Results:

  • RasD expression rescued growth and cytokinesis defects but not motility in rasG null cells.

Related Experiment Videos

  • RasG negatively regulates RasD protein levels.
  • RasB expression in rasG null cells resulted in impaired growth and enhanced motility.
  • RasG also negatively regulates rasB expression.
  • Overexpression of RasB in rasG null cells reduced RasD protein levels.

    • Conclusions:

    • RasG interacts with multiple downstream effectors to regulate distinct cellular processes.
    • RasG plays a role in the negative regulation of RasD and RasB protein levels.
    • Aberrant Ras protein levels due to overexpression can be detrimental to cell function.