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Related Experiment Videos

Ancient genes in contemporary persistent microbial pathogens.

Vijayasarathy Srinivasan1, Harold J Morowitz

  • 1Krasnow Institute for Advanced Study, George Mason University, Fairfax, Virginia 22030, USA. vsriniva@gmu.edu

The Biological Bulletin
|February 28, 2006
PubMed
Summary

Persistent bacteria like M. tuberculosis may use the reductive citric acid (rTCA) cycle for carbon fixation and survival. This metabolic pathway could be a target for new antimicrobial drugs.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Pathogenesis

Background:

  • Autotrophs utilize the reductive citric acid (rTCA) cycle for carbon fixation.
  • Persistent pathogens like Mycobacterium tuberculosis face harsh environments during infection.
  • The rTCA cycle is central to microbial metabolism and survival.

Purpose of the Study:

  • To investigate the potential role of the rTCA cycle in persistent bacterial pathogens.
  • To explore the metabolic adaptations of M. tuberculosis in granuloma environments.
  • To identify potential drug targets within the rTCA pathway.

Main Methods:

  • Genomic annotation to identify key rTCA cycle enzymes.
  • Analysis of metabolic pathways in pathogenic bacteria.
  • Proposed biochemical investigations and gene knockout studies.

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Main Results:

  • Genomic data indicate the presence of essential rTCA cycle enzymes (citrate lyase, 2-oxoglutarate synthase) in M. tuberculosis.
  • The rTCA cycle may operate in a reductive mode for carbon fixation and metabolic balance.
  • A metabolic switch to anaerobic respiration involving the rTCA cycle is hypothesized.

Conclusions:

  • The rTCA cycle is likely crucial for the survival and persistence of pathogenic bacteria.
  • Key enzymes of the rTCA cycle represent potential targets for novel antimicrobial therapies.
  • Mechanism-based drug discovery could lead to treatments for persistent microbial infections.