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Rescue of an intracellular avirulent Rhodococcus equi replication defect by the extracellular addition of virulence-associated protein A.
Journal of Veterinary Medical Science 2017 August 5
Rhodococcus equi is a facultative intracellular bacterium that can escape from bactericidal mechanisms associated with phagocytosis. Virulence-associated protein A (VapA), encoded on a virulence-associated plasmid, is essential for intracellular survival in macrophages, but its function is not known. Here, we show that the extracellular addition of recombinant glutathione S-transferase (GST)-VapA fusion protein rescued the intracellular replication defect of a mutant lacking the vapA gene. Furthermore, the virulence-plasmid-cured strain could also multiply to nearly wild-type levels by the addition of GST-VapA. The present data suggest that VapA can alter the intraphagocytic environment, thereby affecting its suitability for the growth of R. equi.
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