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A metabolic sensor governing cell size in bacteria.

Richard B Weart1, Amy H Lee, An-Chun Chien

  • 1Department of Biology, Washington University, St. Louis, MO 63130, USA.

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Summary

Nutrient levels control bacterial cell size by coupling nutrient availability to cell division. A newly identified metabolic sensor in Bacillus subtilis ensures cells divide only after reaching the correct size and completing DNA replication.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Nutrient availability significantly influences single-celled organism size, with rich media promoting larger cell dimensions compared to nutrient-poor conditions.
  • Cellular mechanisms must exist to sense nutrient levels and regulate cell division timing to ensure appropriate cell size.
  • The ability to modulate cell size based on nutrient status is crucial for microbial growth and survival.

Purpose of the Study:

  • To identify the molecular mechanisms by which nutrient availability regulates cell division timing in Bacillus subtilis.
  • To characterize a novel metabolic sensor that links nutritional status to the cell division machinery.

Main Methods:

  • Investigated nutrient-dependent localization of effector proteins at the cell division site.
  • Assessed the role of effector UgtP in inhibiting the assembly of the FtsZ cell division protein.
  • Analyzed the impact of the sensor on the ratio of FtsZ rings to cell length across different growth rates.

Main Results:

  • Identified a metabolic sensor that couples nutrient availability to cell division in Bacillus subtilis.
  • Discovered that the effector UgtP localizes to the division site in a nutrient-dependent manner.
  • Demonstrated that UgtP inhibits FtsZ assembly, maintaining a constant ratio of FtsZ rings to cell length.

Conclusions:

  • The identified metabolic sensor ensures that Bacillus subtilis cells grow to an appropriate mass and complete chromosome segregation before division.
  • This nutrient-sensing mechanism maintains a consistent cell size irrespective of the growth rate.
  • The effector UgtP plays a critical role in coupling nutrient status to the cell division process.