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Evidence for three separate genes encoding the proteins of the mycobacterial antigen 85 complex

H G Wiker1, K Sletten, S Nagai

  • 1Institute of Immunology and Rheumatology, University of Oslo, Norway.

Infection and Immunity
|January 1, 1990
PubMed

Insights

Mycobacterium bovis BCG secretes antigen 85 complex proteins that bind fibronectin. Distinct differences in purified proteins indicate three separate genes are involved in their production by individual cells.

Area of Science:

  • Immunology
  • Microbiology
  • Molecular Biology

Background:

  • The Mycobacterium bovis BCG (Bacillus Calmette-Guérin) bacterium secretes the antigen 85 complex.
  • This complex is known to bind to human fibronectin, a key component of the extracellular matrix.
  • The antigen 85 complex consists of multiple, closely related antigens that exhibit cross-reactivity.

Purpose of the Study:

  • To investigate the distinct molecular characteristics of the components within the Mycobacterium bovis BCG antigen 85 complex.
  • To determine the cellular origin and genetic basis for the production of these antigens.

Main Methods:

  • Purification of the antigen 85 complex proteins from Mycobacterium bovis BCG.
  • Amino-terminal sequence analysis of the purified protein components.
  • Cellular analysis to determine the production site of individual components.

Main Results:

  • Amino-terminal sequence analysis revealed distinct differences among the purified components of the antigen 85 complex.
  • Data demonstrated that the three components are produced by individual cells.
  • This finding suggests the involvement of three separate genes in the synthesis of the complex.

Conclusions:

  • The Mycobacterium bovis BCG antigen 85 complex comprises distinct protein components.
  • The production of these components is genetically controlled by at least three separate genes.
  • Understanding the genetic basis of antigen 85 complex production is crucial for vaccine development and understanding host-pathogen interactions.

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