Comparative analysis of virulence factors secreted byBacillus anthracisSterne at host body temperature

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Aims:For the analysis of virulence factors produced and secreted by Bacillus anthracis vegetative cells during mammalian host infection, we evaluated the secretome of B. anthracis Sterne exposed to host-specific factors specifically to host body temperature.Methods and Results:We employed a comparative proteomics-based approach to analyse the proteins secreted by B. anthracis Sterne under host-specific body temperature conditions. A total of 17 proteins encoded on a single chromosome and the pXO1 plasmid were identified by peptide mass fingerprinting. Multiple algorithms were used to predict the secretion mechanisms of the detected proteins in B. anthracis.Conclusions:Several putative virulence factors and known factors responsible for sporulation were differentially regulated, including CodY, pXO1-130 and BA1952, revealing insights into temperature cues in the B. anthracis secretome.Significance and Impact of the Study:This study identified temperature-regulated proteins. Further studies aimed at understanding the physical and functional roles of these proteins in infection and control by elevated temperatures will contribute to detection, diagnostics and prophylaxis.

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