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MglA (Macrophage Growth Locus A) is a pleiotropic transcription factor controlling the expression pattern of more than 100 genes in Francisella novicida, including all the ORFs located on the pathogenicity island. To further probe the role of MglA in the pathogenicity of the related strain Francisella tularensis LVS, we generated a mutant LVS strain in which the mglA locus was disrupted by insertion...
In search for antigens which may form the basis for improved subunit or live attenuated B. anthracis vaccines, extensive genomic, proteomic and serologic analyses coupled with functional screens for surface exposed and/or secreted proteins, were carried out. The screens resulted in selection of over 50 promising novel in-vivo expressed immunogens, classified as S-Layer Homology (SLH) proteins, repeat...
A comparative proteomic study of secretomes of virulent and avirulent Bacillus anthracis strains in various culturing conditions, including those encountered in the host (high CO2/bicarbonate), enabled identification of approximately 70 proteins representing collectively more than 99% of the secretome. In-vivo expression of 50 proteins was established by 2-dimension Western-analysis using anti B. anthracis...
We demonstrate that disruption of the htrA (high temperature requirement A) gene in either the virulent Bacillus anthracis Vollum (pXO1+, pXO2+), or in the ΔVollum (pXO1‐, pXO2‐, nontoxinogenic and noncapsular) strains, affect significantly the ability of the resulting mutants to withstand heat, oxidative, ethanol and osmotic stress. The ΔhtrA mutants manifest altered secretion of several proteins,...
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