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Related Experiment Videos

Structural differentiation of the Bacillus subtilis 168 cell wall

L L Graham1, T J Beveridge

  • 1Department of Microbiology, College of Biological Sciences, University of Guelph, Ontario, Canada.

Journal of Bacteriology
|March 1, 1994
PubMed
Summary

Bacillus subtilis cell walls show distinct structural differences, with specific surface sites indicating high hydrolytic activity and structural differentiation, particularly near septa and junctions.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • The cell wall of Bacillus subtilis is a complex structure essential for bacterial survival.
  • Understanding its surface properties and structural organization is key to deciphering bacterial growth and division.

Purpose of the Study:

  • To investigate the structural differentiation and surface properties of Bacillus subtilis cell walls during exponential growth.
  • To identify specific surface sites related to cell wall synthesis and modification.

Main Methods:

  • Utilized polycationized ferritin (PCF) and concanavalin A with electron microscopy for surface labelling.
  • Employed freeze-substitution for high-resolution imaging of cell walls.
  • Analyzed cell wall thickness at different cellular locations.

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Main Results:

  • The Bacillus subtilis cell wall exhibits a fibrous structure and is thicker at septa and pole-cylinder junctions.
  • Surface labelling with PCF and concanavalin A revealed discrete sites, primarily near septa and junctions, indicating localized high hydrolytic activity.
  • Probes did not penetrate the wall fibers, suggesting surface-specific interactions.

Conclusions:

  • The Bacillus subtilis cell wall possesses regions of structural differentiation, with specific surface sites showing increased accessibility to probes.
  • These sites are likely involved in cell wall turnover and localized hydrolytic activity during growth and division.