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Constitutive expression of Pasteurella multocida toxin

I C Hoskins1, A J Lax

  • 1Institute for Animal Health, Compton Laboratory, Compton, Berks., UK.

FEMS Microbiology Letters
|August 1, 1996
PubMed
Summary

Pasteurella multocida toxin (PMT) is constitutively expressed, with minimal regulation observed. Environmental factors like temperature and iron, and the TxaR repressor, showed little effect on toxA gene expression.

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Pasteurella multocida toxin (PMT) is a key virulence factor.
  • Understanding the regulation of PMT production is crucial for controlling P. multocida infections.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling the expression of the Pasteurella multocida toxin (PMT) gene, toxA.
  • To determine the influence of environmental factors and potential repressors on toxA expression.

Main Methods:

  • Investigated toxA gene expression under varying in vitro growth conditions (30°C, iron supplementation).
  • Expressed and mutated the putative repressor TxaR in Escherichia coli.
  • Analyzed toxA gene and promoter structure in naturally occurring non-toxigenic mutants.

Main Results:

  • toxA expression showed less than 4-fold repression with temperature changes or added iron.
  • Deletion or frameshift mutations in TxaR did not affect toxA expression.
  • Non-toxigenic mutants with intact toxA genes showed no major rearrangements or promoter alterations.

Conclusions:

  • PMT is constitutively expressed in Pasteurella multocida.
  • Regulation of toxA expression is minimal, with limited influence from tested environmental factors and the TxaR repressor.

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