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Pathogenic mycobacteria resist lysosomal delivery after uptakeinto macrophages, allowing them to survive intracellularly.We found that the eukaryotic-like serine/threonine protein kinaseG from pathogenic mycobacteria was secreted within macrophagephagosomes, inhibiting phagosome-lysosome fusion and mediatingintracellular survival of mycobacteria. Inactivation of proteinkinase G by gene disruption or chemical inhibition resultedin lysosomal localization and mycobacterial cell death in infectedmacrophages. Besides identifying a target for the control ofmycobacterial infections, these findings suggest that pathogenicmycobacteria have evolved eukaryotic-like signal transductionmechanisms capable of modulating host cell trafficking pathways.
1 Biozentrum, University of Basel, Klingelbergstr. 50/70, CH-4056 Basel, Switzerland. 2 Axxima Pharmaceuticals AG, Max-Lebsche-Platz 32, 81377 Munich, Germany. 3 Pasteur Institute, Engelandstraat 642, B1180 Brussels, Belgium.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: jean.pieters{at}unibas.ch
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