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Related Experiment Videos

The pediocin AcH precursor is biologically active.

B Ray1, R Schamber, K W Miller

  • 1Department of Animal Science, University of Wyoming, Laramie, Wyoming 82071, USA. labcin@uwyo.edu

Applied and Environmental Microbiology
|May 29, 1999
PubMed
Summary
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Prepediocin AcH, the precursor to pediocin AcH, is biologically active and can inhibit bacterial growth. Its activity is controlled before secretion to prevent host cell damage.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacteriocins, like pediocin AcH, are antimicrobial peptides produced by bacteria.
  • Understanding the properties of bacteriocin precursors is crucial for comprehending host cell protection mechanisms during bacteriocin production.

Purpose of the Study:

  • To investigate the biological activity and properties of prepediocin AcH, the precursor to pediocin AcH.
  • To elucidate potential mechanisms by which producer cells protect themselves from intracellular prebacteriocins.

Main Methods:

  • Expression of native prepediocin AcH and mature pediocin AcH in Escherichia coli lacking the PapD enzyme.
  • Synthesis of chimeric proteins involving maltose-binding protein for relative specific activity measurements.
  • Assessment of prepediocin AcH susceptibility to reducing agents, chymotrypsin, and E. coli proteases.

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Main Results:

  • Both native prepediocin AcH and mature pediocin AcH exhibited inhibitory activity against Listeria innocua Lin11.
  • Chimeric prepediocin AcH showed approximately 80% of the specific activity compared to chimeric mature pediocin AcH.
  • Prepediocin AcH was found to be highly susceptible to inactivation by reducing agents and degradation by proteases.

Conclusions:

  • The precursor form of pediocin AcH is biologically active and may pose a risk of toxicity to the host producer cell.
  • Host cells might regulate intracellular prebacteriocin activity through mechanisms such as maintaining the precursor in a reduced, inactive state or promoting its degradation.
  • These findings provide insights into the self-protection strategies employed by bacteriocin-producing organisms.