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Bacillus anthracis surface: capsule and S-layer.

A Fouet1, S Mesnage, E Tosi-Couture

  • 1Unité Toxines et Pathogénie Bactériennes (CNRS URA 1858), Institut Pasteur, Paris, France. afouet@pasteur.fr

Journal of Applied Microbiology
|September 4, 1999
PubMed
Summary
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Bacillus anthracis surface layer (S-layer) proteins EA1 and Sap are crucial for cell wall organization. Their presence is not required for capsulation, indicating complex, compatible cell envelope structures.

Area of Science:

  • Microbiology
  • Bacterial cell wall structure
  • Molecular biology

Background:

  • Bacillus anthracis possesses a complex cell envelope.
  • Surface proteins EA1 and Sap constitute the S-layer.
  • The S-layer's role in capsulation is not fully understood.

Purpose of the Study:

  • To investigate the role of EA1 and Sap proteins in Bacillus anthracis cell wall organization.
  • To determine the relationship between S-layer proteins and capsule formation.

Main Methods:

  • Gene cloning and sequencing of EA1 and Sap.
  • Construction and analysis of single and double gene-disrupted mutants.
  • Co-localization studies of S-layer proteins and capsule.

Main Results:

Related Experiment Videos

  • EA1 and Sap genes are clustered and encode proteins with S-layer homology motifs.
  • EA1 and Sap are co-localized at the cell surface.
  • Capsule formation is independent of EA1 and Sap presence.
  • S-layer proteins are located beneath the capsule when present.

Conclusions:

  • Bacillus anthracis exhibits a complex Gram-positive cell wall organization.
  • The S-layer proteins (EA1, Sap) and capsule are compatible but independently regulated.
  • Neither S-layer proteins nor capsule are essential for the formation of the other structure.