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Journal Article
Research Support, Non-U.S. Gov't
Modulation of phagolysosome maturation by bacterial tlyA gene product.
Journal of Biosciences 2014 December
The pathogenic traits of TlyA proteins of Mycobacterium tuberculosis are not known. Expressions of TlyA in bacteria that do not express endogenous TlyA adhere better to RAW264.7 macrophages and get phagocytosed efficiently. The internalized bacteria avoid acidification to the extent of greater than 65 percent in the case of both TlyA-expressing E. coli and M. smegmatis. Consistent with this observation, we have observed decreased co-localizaton of Lysosomal Membrane Associated Protein-1 (approx. 35 percent), Early Endosomal Antigen-1 (approx. 34 percent), Rab5 (approx. 30 percent) and Rab7 (approx. 35 percent) and enhanced colocalizaton of Rab14 (approx. 80 percent) on both TlyA-expressing bacteria as well as on TlyA-coated latex beads. These results suggest that the mycobacterial TlyA, in general, can modulate phagolysosome maturation pathway immediately after entry into macrophages, while other important molecules may aid the bacterium for long-term, intracellular survival at later point of time.
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