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Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization
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Bacterial cell morphogenesis does not require a preexisting template structure.

Yoshikazu Kawai1, Romain Mercier1, Jeff Errington1

  • 1Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Medical School, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, UK.

Current Biology : CB
|April 8, 2014
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Summary
This summary is machine-generated.

Bacterial cell shape development does not require a cell wall template. Researchers used wall-deficient bacteria (L-forms) to demonstrate that cell shape is restored upon cell wall synthesis, refuting template-directed models.

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Area of Science:

  • Bacterial morphogenesis
  • Cell biology
  • Microbiology

Background:

  • Cell shape in bacteria is determined by the cell wall, a peptidoglycan (PG) and wall teichoic acid (WTA) structure.
  • A long-standing debate exists on whether cell wall synthesis or existing wall material templates bacterial shape.
  • L-forms, wall-deficient bacterial variants, offer a unique system to study shape determination.

Purpose of the Study:

  • To investigate the role of cell wall templates in bacterial morphogenesis.
  • To test the hypothesis that existing cell wall material is required for shape determination in Bacillus subtilis.
  • To utilize a novel L-form system of Bacillus subtilis to study cell shape development.

Main Methods:

  • Generated stable L-forms of Bacillus subtilis by identifying and manipulating genes responsible for the transition.
  • Cultured L-forms in the absence of cell wall synthesis to eliminate template molecules.
  • Restored cell wall synthesis genetically and observed the recovery of classical rod shape.

Main Results:

  • Demonstrated the ability to propagate Bacillus subtilis cells long-term without cell wall synthesis.
  • Showed that upon restoration of cell wall synthesis, cells regained their characteristic rod shape.
  • Conclusively rejected template-directed models for cell shape establishment in Bacillus subtilis.

Conclusions:

  • Bacterial cell shape is not established through a template-directed mechanism involving existing cell wall material.
  • The development of bacterial shape is independent of a pre-existing cell wall template.
  • This study provides critical insights into the fundamental process of bacterial morphogenesis.