![]() This study demonstrates that high levels of recombinant native-like Francisella proteins can be produced in Francisella cells. tularensis LVS, as well as by studying post-translational modification of the cloned genes. The utility of the system was further confirmed by cloning the gapA and FTT_1676 genes into the pEVbr vector and quantifying proteins expression in F. The cloned green fluorescent protein (GFP), used as a reporter, demonstrated almost undetectable basal expression level under uninduced conditions and a highly dynamic dose-dependent response to the inducer. tularensis bfr promoter, and (ii) two tet operator sequences cloned into the promoter. The pEVbr plasmid has been constructed by modifying the TetR-regulated expression vector pEDL17 (LoVullo, 2012) that includes (i) a strong F. Here, we report the construction of a new multipurpose shuttle plasmid – pEVbr – which can be used for high-level expression in F. Understanding the biological and immunological functions of these proteins requires adequate genetic tools for homologous and heterologous expression of cloned genes, maintaining both original structure and post-translational modifications. ![]() A number of its potential virulence factors have been identified, but their biology and functions are not precisely known. Francisella tularensis is a Gram-negative intracellular pathogen causing tularemia.
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