Abstract
We report the identification of BvfA (for Brucella virulence factor A), a small periplasmic protein unique to the genus Brucella, which is essential for the virulence of Brucella suis. A BvfA knockout mutant was highly attenuated both in in vitro macrophage infection assays and in vivo in the murine model of brucellosis. Fluorescence-activated cell sorting analysis with green fluorescent protein fusions showed that the expression of bvfA is induced within macrophages by phagosome acidification and coregulated with the B. suis virB operon, suggesting that it too may play a role in the establishment of the intracellular replication niche.
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