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Related Experiment Videos

C-factor has distinct aggregation and sporulation thresholds during Myxococcus development.

S K Kim1, D Kaiser

  • 1Department of Biochemistry, Stanford University School of Medicine, California 94305.

Journal of Bacteriology
|March 1, 1991
PubMed
Summary
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C-factor protein regulates development in Myxococcus xanthus. Its concentration determines distinct responses, triggering aggregation at low levels and sporulation at high levels, acting as a developmental timer.

Area of Science:

  • Microbiology
  • Bacterial Development
  • Molecular Signaling

Background:

  • C-factor, a protein encoded by the csgA gene, is crucial for Myxococcus xanthus fruiting body development.
  • C-factor acts as a short-range morphogenetic signal, essential for aggregation, sporulation, and C-factor-dependent gene expression.

Purpose of the Study:

  • To investigate the distinct morphogenetic and transcriptional responses elicited by varying concentrations of C-factor in csgA mutant cells.
  • To elucidate the role of C-factor in regulating its own transcription and its function as a developmental timer.

Main Methods:

  • Utilized purified C-factor to treat csgA mutant Myxococcus xanthus cells.
  • Measured C-factor-dependent gene expression at different C-factor concentrations.
  • Quantified csgA transcription and C-factor levels during development.

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Main Results:

  • Low C-factor concentrations induced aggregation and early C-dependent gene expression.
  • High C-factor concentrations promoted aggregation, early and late C-dependent gene expression, and spore formation.
  • C-factor positively autoregulates its own transcription, with a fourfold increase observed during development.

Conclusions:

  • C-factor concentration-dependently controls distinct developmental pathways in Myxococcus xanthus.
  • Autoregulation and dual activity thresholds enable C-factor to function as a timer, orchestrating developmental progression from aggregation to sporulation.