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Journal Article
Review
Formation of the Legionella-containing vacuole: phosphoinositide conversion, GTPase modulation and ER dynamics.
International Journal of Medical Microbiology : IJMM 2017 August 17
The environmental bacterium Legionella pneumophila replicates in free-living amoeba as well as in alveolar macrophages upon inhalation of bacteria-laden aerosols. Resistance of the opportunistic pathogen to macrophages is a prerequisite to cause a severe pneumonia called Legionnaires' disease. L. pneumophila grows intracellularly in a unique, ER-associated compartment, the Legionella-containing vacuole (LCV). The bacterial Icm/Dot type IV secretion system represents an essential virulence factor, which translocates approximately 300 "effector proteins" into protozoan or mammalian host cells. Some of these effectors contribute to the formation of the LCV by targeting conserved host factors implicated in membrane dynamics, such as phosphoinositide lipids and small GTPases. Here we review recent findings on the role of phosphoinositides, small and large GTPases as well as ER dynamics for pathogen vacuole formation and intracellular replication of L. pneumophila.
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