Linked Life Data

16573683

Source:http://linkedlifedata.com/resource/pubmed/id/16573683

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pubmed-article:16573683pubmed:abstractTextTwo-component signal transduction systems (2-CS) play an important role in bacterial pathogenesis. In the work presented here, we have studied the effects of a mutation in the Mycobacterium tuberculosis (Mtb) PhoPR 2-CS on the pathogenicity, physiology and global gene expression of this bacterial pathogen. Disruption of PhoPR causes a marked attenuation of growth in macrophages and mice and prevents growth in low-Mg2+ media. The inability to grow in THP-1 macrophages can be partially overcome by the addition of excess Mg2+ during infection. Global transcription assays demonstrate PhoP is a positive transcriptional regulator of several genes, but do not support the hypothesis that the Mtb PhoPR system is sensing Mg2+ starvation, as is the case with the Salmonella typhimurium PhoPQ 2-CS. The genes that were positively regulated include those found in the pks2 and the msl3 gene clusters that encode enzymes for the biosynthesis of sulphatides and diacyltrehalose and polyacyltrehalose respectively. Complementary biochemical studies, in agreement with recent results from another group, indicate that these complex lipids are also absent from the phoP mutant, and the lack of these components in its cell envelope may indirectly cause the mutant's high-Mg2+ growth requirement. The experiments reported here provide functional evidence for the PhoPR 2-CS involvement in Mtb pathogenesis, and they suggest that a major reason for the attenuation observed in the phoP mutant is the absence of certain complex lipids that are known to be important for virulence.lld:pubmed
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pubmed-article:16573683pubmed:articleTitleThe Mycobacterium tuberculosis PhoPR two-component system regulates genes essential for virulence and complex lipid biosynthesis.lld:pubmed
pubmed-article:16573683pubmed:affiliationTB Center, The Public Health Research Institute, 225 Warren Street, Newark, NJ 07103, USA.lld:pubmed
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