Effects of Lysosomal Membrane Protein Depletion on the Salmonella-Containing Vacuole
Effects of Lysosomal Membrane Protein Depletion on the Salmonella-Containing Vacuole
Salmonella is an intracellular bacterial pathogen that replicates within a membrane-bound vacuole in host cells. The major lysosomal membrane proteins 1 and 2 (LAMP-1 and LAMP-2) are recruited to the Salmonella-containing vacuole as well as Salmonella- associated filaments (Sifs) that emerge from the vacuole. LAMP-1 is a dominant membrane marker for the vacuole and Sifs. Its colocalization with both is dependent on a major secreted bacterial virulence protein, SifA. Here, we show that SifA is required for the recruitment of LAMP-2 and can be used as a second independent marker for both the bacterial vacuolar membrane and Sifs. Further, RNAi studies revealed that in LAMP-1 depleted cells, the bacteria remain membrane bound as measured by their association with LAMP-2 protein. In contrast, LAMP-2 depletion increased the amount of LAMP-1 free bacteria. Together, the data suggests that despite its abundance, LAMP-1 is not essential, but LAMP-2 may be partially important for the Salmonella-containing vacuolar membrane.
- University of Notre Dame United States
- Northwestern University United States
Salmonella typhimurium, Science, Q, R, Biological Transport, Intracellular Membranes, Lysosomal Membrane Proteins, Protein Transport, Bacterial Proteins, Gene Knockdown Techniques, Lysosomal-Associated Membrane Protein 2, Salmonella Infections, Vacuoles, Medicine, Humans, RNA, Small Interfering, Research Article, Cell Proliferation, Glycoproteins, HeLa Cells
Salmonella typhimurium, Science, Q, R, Biological Transport, Intracellular Membranes, Lysosomal Membrane Proteins, Protein Transport, Bacterial Proteins, Gene Knockdown Techniques, Lysosomal-Associated Membrane Protein 2, Salmonella Infections, Vacuoles, Medicine, Humans, RNA, Small Interfering, Research Article, Cell Proliferation, Glycoproteins, HeLa Cells
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