| Literature DB >> 24528862 |
Yong Yang1, Kathleen Kulka1, Ronald C Montelaro2, Todd A Reinhart1, James Sissons3, Alan Aderem3, Anil K Ojha4.
Abstract
Chronic tuberculosis in an immunocompetent host is a consequence of the delicately balanced growth of Mycobacterium tuberculosis (Mtb) in the face of host defense mechanisms. We identify an Mtb enzyme (TdmhMtb) that hydrolyzes the mycobacterial glycolipid trehalose dimycolate and plays a critical role in balancing the intracellular growth of the pathogen. TdmhMtb is induced under nutrient-limiting conditions and remodels the Mtb envelope to increase nutrient influx but concomitantly sensitizes Mtb to stresses encountered in the host. Consistent with this, a ΔtdmhMtb mutant is more resilient to stress and grows to levels higher than those of wild-type in immunocompetent mice. By contrast, mutant growth is retarded in MyD88(-/-) mice, indicating that TdmhMtb provides a growth advantage to intracellular Mtb in an immunocompromised host. Thus, the effects and countereffects of TdmhMtb play an important role in balancing intracellular growth of Mtb in a manner that is directly responsive to host innate immunity.Entities:
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Year: 2014 PMID： 24528862 PMCID： PMC3974621 DOI： 10.1016/j.chom.2014.01.008
Source DB: PubMed Journal: Cell Host Microbe ISSN： 1931-3128 Impact factor: 21.023