Comparative proteomic profiling of culture filtrate proteins of less and highly virulent Francisella tularensis strains |
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Authors: | Konecna Klara Hernychova Lenka Reichelova Marketa Lenco Juraj Klimentova Jana Stulik Jiri Macela Ales Alefantis Tim Delvecchio Vito G |
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Affiliation: | Institute of Molecular Pathology, Faculty of Military Health Sciences, University of Defense, Hradec Kralove, Czech Republic. |
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Abstract: | The facultative intracellular bacterium Francisella tularensis is the causal agent of the serious infectious disease tularemia. Despite the dynamic progress, which has been made in last few years, important questions regarding Francisella pathogenicity still remain to be answered. Generally, secreted proteins play an important role in pathogenicity of intracellular microbes. In this study, we investigated the protein composition of the culture filtrate proteins of highly virulent F. tularensis subsp. tularensis, strain SCHU S4 and attenuated F. tularensis subsp. holarctica, live vaccine strain using a comparative proteomic analysis. The majority of proteins identified in this study have been implicated in virulence mechanisms of other pathogens, and several have been categorized as having moonlighting properties; those that have more than one unrelated function. This profiling study of secreted proteins resulted in the unique detection of acid phosphatase (precursor) A (AcpA), β-lactamase, and hypothetical protein FTT0484 in the highly virulent strain SCHU S4 secretome. The release of AcpA may be of importance for F. tularensis subsp. tularensis virulence due to the recently described AcpA role in the F. tularensis escape from phagosomes. |
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Keywords: | Culture filtrate proteins Francisella tularensis Microbiology Moonlighting proteins Secreted proteins Virulence factors |
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