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Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG
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AtxA, a Bacillus anthracis global virulence regulator.

Agnès Fouet1

  • 1Institut Pasteur, Toxines et Pathogénie Bactérienne, Département de Microbiologie, 28 rue du Dr Roux, 75724 Paris cedex 15, France. agnes.fouet@pasteur.fr

Research in Microbiology
|September 25, 2010
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Summary

AtxA, a Bacillus anthracis master regulator, controls over 100 genes, linking metabolism to virulence. Its precise regulatory mechanism remains largely unknown but is influenced by bicarbonate.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • AtxA identified as a toxin gene activator in Bacillus anthracis.
  • AtxA later recognized as a master regulator of B. anthracis.

Purpose of the Study:

  • To elucidate the regulatory mechanism of AtxA.
  • To understand how AtxA controls virulence gene expression.

Main Methods:

  • Analysis of AtxA's regulatory targets.
  • Investigation of AtxA's interaction with genetic elements.

Main Results:

  • AtxA regulates over 100 genes on chromosomes and plasmids.
  • AtxA influences major virulence factor expression.
  • AtxA exhibits both activation and repression of gene expression.
  • Bicarbonate/CO(2) induces many AtxA-controlled genes.
  • AtxA's control can be direct or indirect.

Conclusions:

  • AtxA is a central regulator connecting metabolic status to virulence in B. anthracis.
  • The exact mechanism of AtxA-mediated gene regulation requires further investigation.