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Related Experiment Videos

Morphogenesis of bacillus spore surfaces.

Venkata G R Chada1, Erik A Sanstad, Rong Wang

  • 1Department of Biological, Chemical, and Physical Sciences, Illinois Institute of Technology, Chicago, Illinois 60616, USA.

Journal of Bacteriology
|October 18, 2003
PubMed
Summary

Bacillus spore coats feature species-specific bumps and ridges, revealed by atomic-force microscopy. Coat proteins CotA, CotB, and CotE are crucial for forming these dynamic surface structures.

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Area of Science:

  • Microbiology
  • Biophysics
  • Structural Biology

Background:

  • Bacillus spores possess a complex, proteinaceous coat, sometimes with an exosporium.
  • Spore coat morphology is critical for spore function and survival.
  • Understanding spore surface structures aids in species identification and spore behavior analysis.

Purpose of the Study:

  • To characterize the surface morphology of Bacillus spore coats using atomic-force microscopy (AFM).
  • To identify specific coat proteins responsible for the formation of spore surface features.
  • To investigate the dynamic nature of the spore coat during germination.

Main Methods:

  • Atomic-force microscopy (AFM) was employed to image wild-type and mutant Bacillus subtilis, Bacillus cereus, and Bacillus anthracis spores.

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  • Analysis focused on surface topography, including bumps and ridges.
  • Mutant strains deficient in specific coat proteins (CotA, CotB, CotE) were examined.

    • Main Results:

    • Bacillus spore coats exhibit species-specific surface bumps (7–40 nm) and ridges.
    • Ridge structures vary sufficiently between species for identification.
    • AFM revealed novel roles for CotA and CotB in ridge formation, alongside CotE.

    Conclusions:

    • The Bacillus spore coat is a dynamic structure, not inert.
    • Coat proteins CotA, CotB, and CotE play key roles in shaping spore surface morphology.
    • The observed ridges may unfold during spore germination, accommodating volume changes.