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Related Experiment Videos

Anaerobic yeast killer systems.

L Polonelli1, M G Menozzi, L Campani

  • 1Istituto di Microbiologia, Università degli Studi di Parma, Italy.

European Journal of Epidemiology
|May 1, 1992
PubMed
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Anaerobic conditions impact yeast killer toxin activity, affecting sensitive strains more than toxin production. This finding enabled using killer yeasts for typing Bacteroides fragilis in epidemiology.

Area of Science:

  • Microbiology
  • Yeast Genetics
  • Epidemiology

Background:

  • The killer phenomenon in yeasts involves toxin production that inhibits sensitive strains.
  • Understanding how environmental conditions affect killer activity is crucial for applications.
  • Genetic determinants of killer systems vary among yeast species like Pichia, Kluyveromyces, and Saccharomyces.

Purpose of the Study:

  • To investigate the influence of anaerobic conditions on the killer phenomenon in various yeast isolates.
  • To determine if anaerobic conditions differentially affect killer toxin production versus sensitive strain metabolism.
  • To explore the utility of killer yeast systems for epidemiological typing under anaerobic conditions.

Main Methods:

  • Studied yeast isolates from Pichia spp., Kluyveromyces lactis, and Saccharomyces cerevisiae.

Related Experiment Videos

  • Assessed killer toxin activity against sensitive strains (P. anomala, K. lactis, Candida albicans, S. cerevisiae) under anaerobic conditions.
  • Selected killer yeast panels effective under anaerobiosis for typing Bacteroides fragilis.

    • Main Results:

    • Anaerobiosis modulated killer toxin activity in some Pichia and Saccharomyces isolates.
    • Sensitive strains of P. anomala, K. lactis, and C. albicans were affected by anaerobiosis.
    • No significant influence of anaerobiosis was observed on a sensitive S. cerevisiae isolate of S. cerevisiae.
    • Anaerobic conditions appeared to interfere more with sensitive yeast metabolism than with killer yeast toxin production.

    Conclusions:

    • Anaerobic conditions have a variable impact on yeast killer phenomenon expression.
    • The study highlights that anaerobic conditions primarily affect sensitive yeast metabolic processes.
    • The killer yeast system, adapted for anaerobic conditions, proved effective for epidemiological typing of Bacteroides fragilis isolates.