Publications de Anna De Graff Tischler

Mycobacterium tuberculosis Resists Stress by Regulating PE19 Expression

Mycobacterium tuberculosis requires the phosphate-sensing signal transduction system Pst/SenX3-RegX3 to resist host immune responses. A Delta pstA1 mutant lacking a Pst phosphate uptake system component is hypersensitive to diverse stress conditions in vit ...

American Society for Microbiology2016

Mycobacterium tuberculosis Phosphate Uptake System Component PstA2 Is Not Required for Gene Regulation or Virulence

John McKinney, Anna De Graff Tischler

The Mycobacterium tuberculosis genome encodes two complete high-affinity Pst phosphate-specific transporters. We previously demonstrated that a membrane-spanning component of one Pst system, PstA1, was essential both for M. tuberculosis virulence and for r ...

Public Library of Science2016

Mycobacterium tuberculosis Requires Phosphate-Responsive Gene Regulation To Resist Host Immunity

John McKinney, Anna De Graff Tischler

Mycobacterium tuberculosis persists in the tissues of mammalian hosts despite inducing a robust immune response dominated by the macrophage-activating cytokine gamma interferon (IFN-gamma). We identified the M. tuberculosis phosphate-specific transport (Ps ...

American Society for Microbiology2013

Phenotypic Profiling of Mycobacterium tuberculosis EspA Point Mutants Reveals that Blockage of ESAT-6 and CFP-10 Secretion In Vitro Does Not Always Correlate with Attenuation of Virulence

Stewart Cole, Anna De Graff Tischler, Neeraj Dhar, Florence Pojer, Jeffrey Chen, Ming Zhang, Jan Lars Rybniker

The EspA protein of Mycobacterium tuberculosis is essential for the type VII ESX-1 protein secretion apparatus, which delivers the principal virulence factors ESAT-6 and CFP-10. In this study, site-directed mutagenesis of EspA was performed to elucidate it ...

American Society for Microbiology2013

Spontaneous phthiocerol dimycocerosate-deficient variants of Mycobacterium tuberculosis are susceptible to gamma interferon-mediated immunity

John McKinney, Anna De Graff Tischler, Swapna Uplekar

Onset of the adaptive immune response in mice infected with Mycobacterium tuberculosis is accompanied by slowing of bacterial replication and establishment of a chronic infection. Stabilization of bacterial numbers during the chronic phase of infection is ...

2011

Bacterial strategies for survival in the host

John McKinney, Anna De Graff Tischler

This chapter focuses on the strategies that persistent bacterial pathogens use to evade, subvert, and disarm the host immune system. Bacteria can avoid these host defense mechanisms by presenting the immune system with a continuously evolving antigen reper ...

ASM Press2011

Contrasting persistence strategies in Salmonella and Mycobacterium

John McKinney, Anna De Graff Tischler

Long-term survival of persistent bacterial pathogens in mammalian hosts critically depends on their ability to avoid elimination by innate and adaptive immune responses. The persistent human pathogens that cause typhoid fever and tuberculosis exemplify alt ...

2010

The Vibrio cholerae hybrid sensor kinase VieS contributes to motility and biofilm regulation by altering the cyclic diguanylate level

Anna De Graff Tischler

Phosphorelay systems are important mediators of signal transduction during bacterial adaptation to new environments. Previously we described the vieSAB operon, encoding a putative three-protein component phosphorelay involved in regulating Vibrio cholerae ...

American Society for Microbiology2008