Salmonella Typhimurium effector SseI regulates host peroxisomal dynamics to acquire lysosomal cholesterol for better intracellular growth
Raj, D.; Nair, A. V.; Sharma, J.; Prakash, S.; Kaushik, A.; Basu, S.; Sahu, S.; Singh, S.; Bhosale, V.; Chandra, T.; Ghoshal, U. C.; Dasgupta, A.; Siddiqi, M. I.; Gupta, S. K.; Chakravortty, D.; Ammanathan, V.; LAHIRI, A.
Show abstract
Intracellular Salmonella resides and multiplies in cholesterol-rich specialized compartment called Salmonella-containing vacuoles (SCVs) and avoids fusion with acidic lysosomes. Given, lysosomes are primary organelle that redistributes LDL derived cholesterol to other organelles; we questioned how lysosomal cholesterol can be transported to SCV. We demonstrate here that peroxisomes are recruited to SCVs in human primary macrophages, epithelial cells and functions as pro-bacterial organelles. Further, this interaction is assisted by SseI, a Salmonella effector protein containing mammalian peroxisome targeting sequence. SseI localizes to peroxisome, interacts and activates a host Ras GTPase, ARF-1 on the peroxisome membrane. Activation of ARF-1 leads to recruitment of phosphatidylinsolitol-5- phosphate-4 kinase to generate phosphatidylinsolitol-4-5-bisphosphate on peroxisomes. Accordingly, the{Delta} sseI strain showed reduced virulence in cell lines and during mice infection. Taken together, our work identified a fascinating mechanism by which a pathogen targets host organelles via its secretory effectors and exploits host metabolic intermediates for its intracellular proliferation.
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