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[Inductive effect of hypoxanthine-xanthine oxidase system on lambda prophage].

S Q Zhu1, C X Fang, S H Zhu

  • 1College of Life Sciences, Wuhan University, Wuhan, 430072, China.

Mikrobiologiia
|April 13, 2004
PubMed
Summary

The hypoxanthine-xanthine oxidase (HX-XO) system induces lambda prophage in bacteria. This process, driven by superoxide anions, leads to lytic growth and is influenced by reactant concentrations and cell density.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • The hypoxanthine-xanthine oxidase (HX-XO) system is known to generate superoxide anions.
  • Bacteriophages, such as lambda prophage, can exist in lysogenic or lytic states within host bacteria.

Purpose of the Study:

  • To investigate the inductive effect of the HX-XO system on lambda prophage.
  • To determine the relationship between HX-XO system parameters and prophage induction.

Main Methods:

  • Lysogenic bacteria were treated with varying concentrations of hypoxanthine (HX) and xanthine oxidase (XO).
  • Prophage induction was quantified by plaque-forming units (PFU).
  • The effect of antioxidants (glutathione, superoxide dismutase, catalase) on induction was assessed.

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Main Results:

  • The HX-XO system successfully induced lambda prophage from a lysogenic to a lytic state.
  • Induction was directly proportional to HX and XO concentrations and inversely related to pre-incubation time.
  • Optimal induction occurred at specific HX (0.86 mM), XO (1.6 x 10(-2) U/ml), and cell density (10(8) cells/ml) conditions.
  • Antioxidants significantly inhibited the inductive effect.

Conclusions:

  • Superoxide anions generated by the HX-XO system are the primary factors inducing lambda prophage.
  • This study elucidates a mechanism for triggering viral replication in lysogenic bacteria using a chemical system.