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Sporulation in bacteria requires both active Spo0A and an extracellular factor (FacX) that accumulates post-exponentially. This finding challenges the necessity of gradual Spo0A activation for triggering bacterial sporulation.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Sporulation initiation in bacteria is primarily controlled by the master regulator Spo0A.
  • Active Spo0A (Spo0A-P) levels increase as cells enter stationary phase.
  • Previous studies suggested sporulation requires gradual Spo0A-P accumulation.

Purpose of the Study:

  • To investigate the role of extracellular factors in bacterial sporulation.
  • To determine if gradual Spo0A-P accumulation is essential for sporulation.
  • To identify conditions that trigger sporulation during exponential growth.

Main Methods:

  • Artificial induction of constitutively active Spo0A and the kinase KinA.
  • Dialysis and proteinase K digestion to characterize extracellular factors.
  • Assessing sporulation in Bacillus subtilis under various conditions.

Main Results:

  • Sporulation induced by KinA requires an extracellular factor (FacX) present in post-exponential growth phases.
  • FacX is a small, heat-stable molecule, retained by dialysis (<500 Dalton), and sensitive to proteinase K.
  • FacX activity is independent of the Opp and App oligopeptide transporters, SigH, Spo0A, and ComX.
  • Constitutively active Spo0A can induce sporulation in the presence of FacX, irrespective of accumulation rate.

Conclusions:

  • Bacterial sporulation requires both sufficient active Spo0A levels and at least one additional signal, such as FacX.
  • Gradual Spo0A-P accumulation is not a prerequisite for sporulation.
  • Extracellular factors play a crucial role in coordinating bacterial developmental processes like sporulation.