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Related Experiment Videos

Three pathways for trehalose biosynthesis in mycobacteria.

Koen A L De Smet1, Anthony Weston2, Ivor N Brown1

  • 1Department of Infectious Diseases and Microbiology, Imperial College School of Medicine, St Mary's Campus, Norfolk Place, London W2 1PG, UK1.

Microbiology (Reading, England)
|February 5, 2000
PubMed
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Mycobacteria utilize multiple pathways to synthesize trehalose, a sugar important for their survival and implicated in disease. This research identifies and confirms three distinct trehalose biosynthesis routes in mycobacteria.

Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Trehalose is a disaccharide found in mycobacteria, contributing to their cell walls and potentially causing tissue damage during infection.
  • Understanding trehalose metabolism is crucial for comprehending mycobacterial physiology and pathogenesis.

Purpose of the Study:

  • To investigate the complete trehalose biosynthesis pathways in mycobacteria.
  • To identify the genes and enzymes responsible for trehalose production.
  • To assess the functional activity of these pathways in different mycobacterial species.

Main Methods:

  • Bioinformatic analysis of the Mycobacterium tuberculosis genome to identify potential trehalose biosynthesis genes.
  • Functional assays using mycobacterial extracts to confirm enzyme activity.

Related Experiment Videos

  • Recombinant enzyme expression and characterization.
  • Comparative analysis of pathway functionality in Mycobacterium smegmatis, Mycobacterium bovis BCG, and Mycobacterium leprae.

    • Main Results:

    • Three active trehalose biosynthesis pathways were identified and confirmed in mycobacteria: the OtsA-OtsB pathway (from glucose 6-phosphate and UDP-glucose), the TreY-TreZ pathway (from alpha(1-->4)-linked glucose polymers), and the TreS pathway (from maltose).
    • All three pathways were found to be active in both rapid-growing Mycobacterium smegmatis and slow-growing Mycobacterium bovis BCG.
    • A disrupted treZ gene in Mycobacterium leprae suggests this specific pathway is non-functional in this species.

    Conclusions:

    • Mycobacteria possess multiple, active pathways for trehalose biosynthesis, highlighting the sugar's significant role in their physiology.
    • The presence of these diverse pathways suggests a crucial function for trehalose in mycobacterial survival and adaptation.
    • Variations in pathway functionality, such as in Mycobacterium leprae, may offer insights into species-specific adaptations and virulence.