Intracellular Salmonella enterica redirect exocytic transport processes in a Salmonella pathogenicity island 2-dependent manner

Traffic
Volker KuhleM Hensel

Abstract

During intracellular life, Salmonella enterica proliferate within a specialized membrane compartment, the Salmonella-containing vacuole (SCV), and interfere with the microtubule cytoskeleton and cellular transport. To characterize the interaction of intracellular Salmonella with host cell transport processes, we utilized various model systems to follow microtubule-dependent transport. The vesicular stomatitis virus glycoprotein (VSVG) is a commonly used marker to follow protein transport from the Golgi to the plasma membrane. Using a VSVG-GFP fusion protein, we observed that virulent intracellular Salmonella alter exocytotic transport and recruit exocytotic transport vesicles to the SCV. This virulence function was dependent on the function of the type III secretion system encoded by Salmonella Pathogenicity Island 2 (SPI2) and more specifically on a subset of SPI2 effector proteins. Furthermore, the Golgi to plasma membrane traffic of the shingolipid C(5)-ceramide was redirected to the SCV by virulent Salmonella. We propose that Salmonella modulates the biogenesis of the SCV by deviating this compartment from the default endocytic pathway to an organelle that interacts with the exocytic pathway. This observation might reveal a...Continue Reading

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