A network of Rab GTPases controls phagosome maturation and is modulated by Salmonella enterica serovar Typhimurium |
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| Authors: | Smith Adam C Heo Won Do Braun Virginie Jiang Xiuju Macrae Chloe Casanova James E Scidmore Marci A Grinstein Sergio Meyer Tobias Brumell John H |
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| Affiliation: | Program in Cell Biology, The Hospital for Sick Children, Toronto, Ontario, Canada, M5G 1X8. |
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| Abstract: | Members of the Rab guanosine triphosphatase (GTPase) family are key regulators of membrane traffic. Here we examined the association of 48 Rabs with model phagosomes containing a non-invasive mutant of Salmonella enterica serovar Typhimurium (S. Typhimurium). This mutant traffics to lysosomes and allowed us to determine which Rabs localize to a maturing phagosome. In total, 18 Rabs associated with maturing phagosomes, each with its own kinetics of association. Dominant-negative mutants of Rab23 and 35 inhibited phagosome-lysosome fusion. A large number of Rab GTPases localized to wild-type Salmonella-containing vacuoles (SCVs), which do not fuse with lysosomes. However, some Rabs (8B, 13, 23, 32, and 35) were excluded from wild-type SCVs whereas others (5A, 5B, 5C, 7A, 11A, and 11B) were enriched on this compartment. Our studies demonstrate that a complex network of Rab GTPases controls endocytic progression to lysosomes and that this is modulated by S. Typhimurium to allow its intracellular growth. |
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