Journal
CELL
Volume 150, Issue 4, Pages 792-802Publisher
CELL PRESS
DOI: 10.1016/j.cell.2012.06.036
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Funding
- ERA-NET PathoGenoMics
- Israel Science Foundation
- European Union FP7 (IRG) program
- Legacy Heritage Fund, Israel Science Foundation
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The DNA uptake competence (Com) system of the intracellular bacterial pathogen Listeria monocytogenes is considered nonfunctional. There are no known conditions for DNA transformation, and the Com master activator gene, comK, is interrupted by a temperate prophage. Here, we show that the L. monocytogenes Com system is required during infection to promote bacterial escape from macrophage phagosomes in a manner that is independent of DNA uptake. Further, we find that regulation of the Com system relies on the formation of a functional comK gene via prophage excision. Prophage excision is specifically induced during intracellular growth, primarily within phagosomes, yet, in contrast to classic prophage induction, progeny virions are not produced. This study presents the characterization of an active prophage that serves as a genetic switch to modulate the virulence of its bacterial host in the course of infection.
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