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Interplay between flagellation and cell cycle control in Caulobacter.

Silvia Ardissone1, Patrick H Viollier1

  • 1Department of Microbiology and Molecular Medicine, Institute of Genetics and Genomics in Geneva (iGE3), Faculty of Medicine, University of Geneva, Rue Michel Servet 1, 1211 Geneva 4, Switzerland.

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Bacterial flagellum assembly is tightly controlled, with transcript levels and cell cycle cues regulating its construction and placement. This research uses flagellar motility as a model to understand bacterial cell cycle progression and polarity.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Bacterial Locomotion

Background:

  • The bacterial flagellum is a complex nanomachine essential for motility.
  • Flagellum assembly in Caulobacter crescentus is precisely regulated throughout the cell cycle.
  • Transcriptional and post-transcriptional mechanisms control flagellar gene expression and protein localization.

Purpose of the Study:

  • To investigate the regulatory mechanisms governing flagellum assembly in Caulobacter crescentus.
  • To utilize flagellar motility as a model system for studying bacterial cell cycle progression and polarity.
  • To explore how bacteria coordinate the display of surface structures with cell cycle events.

Main Methods:

  • Analysis of flagellar transcript abundance during the cell cycle.
  • Investigating conserved regulators of flagellar gene expression.
  • Studying post-transcriptional cell cycle cues affecting flagellar assembly and disassembly.

Main Results:

  • Flagellar transcript abundance oscillates predictably during the Caulobacter crescentus cell cycle.
  • Conserved regulators control the timing of both flagellar structural protein and polarization factor gene expression.
  • Post-transcriptional cues influence the precise timing and location of flagellar assembly and disassembly.

Conclusions:

  • Flagellum assembly is a highly regulated process involving coordinated transcriptional and post-transcriptional control.
  • Bacterial motility serves as a tractable system for dissecting fundamental processes of cell cycle progression and polarity.
  • Understanding flagellar regulation provides insights into the broader mechanisms of bacterial surface structure display.