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L-proline as a nitrogen source increases the susceptibility of Saccharomyces cerevisiae S288c to fluconazole

C A Stella1, R Costanzo, H I Burgos

  • 1Biochemistry Department, School of Medicine, Buenos Aires University, Argentina.

Folia Microbiologica
|November 20, 1998
PubMed

Insights

Fluconazole growth inhibition in Saccharomyces cerevisiae varies with nitrogen source. L-proline maximized inhibition, while ammonia led to the highest fluconazole resistance and rhodamine 6G accumulation.

Area of Science:

  • Microbiology
  • Mycology
  • Biochemistry

Background:

  • Saccharomyces cerevisiae is a model organism for studying fungal biology.
  • Fluconazole is a widely used antifungal agent.
  • Nitrogen availability can influence fungal growth and drug response.

Purpose of the Study:

  • To investigate the impact of different nitrogen sources on fluconazole's antifungal activity.
  • To determine how nitrogen availability affects fluconazole resistance and cellular accumulation.

Main Methods:

  • Evaluating Saccharomyces cerevisiae S288c growth inhibition by fluconazole.
  • Utilizing ammonia, L-proline, and L-leucine as sole nitrogen sources.
  • Measuring rhodamine 6G accumulation as an indicator of drug efflux.

Main Results:

  • Fluconazole exhibited maximum growth inhibition when L-proline was the nitrogen source.
  • Ammonia as the sole nitrogen source resulted in the highest levels of rhodamine 6G accumulation.
  • Ammonia also correlated with the highest fluconazole resistance in Saccharomyces cerevisiae.

Conclusions:

  • The choice of nitrogen source significantly modulates fluconazole's efficacy and resistance mechanisms in Saccharomyces cerevisiae.
  • L-proline enhances fluconazole's direct inhibitory effect on growth.
  • Ammonia promotes efflux pump activity, leading to increased fluconazole resistance.

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