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Bacillus anthracis cell envelope components.

A Fouet1, S Mesnage

  • 1Toxines et Pathogénie Bactériennes (URA 2172, CNRS), Institut Pasteur, 28 rue du Dr Roux, 75724, Paris, France. afouet@pasteur.fr

Current Topics in Microbiology and Immunology
|September 13, 2002
PubMed
Summary
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Bacillus anthracis possesses a unique cell wall structure, including a peptidoglycan layer and an S-layer composed of specific proteins. Its poly-gamma-D-glutamate capsule provides an antiphagocytic role, crucial for bacterial survival in host environments.

Area of Science:

  • Microbiology
  • Bacterial Cell Wall Structure
  • Pathogenesis

Background:

  • Bacillus anthracis is a Gram-positive bacterium.
  • It has a complex cell wall structure.
  • The cell wall is essential for bacterial survival and virulence.

Purpose of the Study:

  • To describe the detailed architecture of the Bacillus anthracis cell wall.
  • To identify the components and their organization within the cell wall.
  • To elucidate the role of the poly-gamma-D-glutamate capsule in virulence.

Main Methods:

  • Detailed biochemical analysis of cell wall components.
  • Microscopic examination of bacterial structure.
  • Investigation of capsule synthesis under specific environmental conditions.

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Main Results:

  • The cell wall comprises a peptidoglycan layer (A1 gamma type) and an outer S-layer.
  • A unique polysaccharide is covalently linked to the peptidoglycan.
  • The S-layer is formed by two proteins anchored via their SLH N-terminal domain.
  • A poly-gamma-D-glutamate capsule, with an antiphagocytic role, is synthesized under host-mimicking conditions (37°C, bicarbonate).

Conclusions:

  • Bacillus anthracis exhibits a highly specialized cell envelope.
  • The S-layer proteins and polysaccharide layer contribute to cell wall integrity.
  • The poly-gamma-D-glutamate capsule is a key virulence factor regulated by environmental cues.