stalling autophagy: a new function for listeria phospholipases
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2014
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Abstract
Listeria monocytogenes is a Gram-positive bacterial pathogen that induces its own uptake in non-phagocytic cells. Following invasion, Listeria escapes from the entry vacuole through the secretion of a pore-forming toxin, listeriolysin O (LLO) that acts to damage and disrupt the vacuole membrane. Listeria then replicates in the cytosol and is able to spread from cell-to-cell using actin-based motility. In addition to LLO, Listeria produces two phospholipase toxins, a phosphatidylinositol-specific phospholipase C (PI-PLC, encoded by plcB) and a broad-range phospholipase C (PC-PLC, encoded by plcA), which contribute to bacterial virulence. It has long been recognized that secretion of PI- and PC-PLC enables the disruption of the double membrane vacuole during cell-to-cell spread, and those phospholipases have also been shown to augment LLO-dependent escape from the entry endosome. However, a specific role for Listeria phospholipases during the cytosolic stage of infection has not been previously reported. In a recent study, we demonstrated that Listeria PI-PLC and PC-PLC contribute to the bacterial escape from autophagy through a mechanism that involves direct inhibition of the autophagic flux in the infected cells [Tattoli et al. EMBO J (2013), 32, 3066-3078].
| Reference Key |
tattoli2014microbialstalling
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| Authors | ;Ivan Tattoli;Matthew T. Sorbara;Dana J. Philpott;Stephen E. Girardin |
| Journal | povolžskaâ arheologiâ |
| Year | 2014 |
| DOI |
10.15698/mic2014.01.124
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