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Related Experiment Videos

Thiamine secretion in yeast.

Y Haj-Ahmad1, C A Bilinski, I Russell

  • 1Biology Department, Brock University, St. Catharines, Ont., Canada.

Canadian Journal of Microbiology
|November 1, 1992
PubMed
Summary
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Researchers screened 188 yeast and fungal cultures to find thiamine (vitamin B1) excretors. Nine cultures were identified as thiamine excretors, with some overproducing the vitamin intracellularly.

Area of Science:

  • Microbiology
  • Biochemistry
  • Mycology

Background:

  • Thiamine (vitamin B1) is essential for cellular metabolism.
  • Identifying microorganisms capable of thiamine excretion or overproduction is crucial for biotechnological applications.
  • Understanding microbial thiamine metabolism can offer insights into nutrient cycling and industrial fermentation.

Purpose of the Study:

  • To screen a diverse collection of yeast and fungal cultures for thiamine excretion and overproduction.
  • To identify novel microbial strains with enhanced thiamine production capabilities.
  • To characterize thiamine-excreting isolates and investigate their intracellular thiamine levels.

Main Methods:

  • Screening of 188 yeast and fungal cultures across nine yeast and three fungal genera.

Related Experiment Videos

  • Utilized cross-feeding assays on thiamine-free agar medium with thiamine-requiring yeast strains.
  • Employed direct detection methods for excreted thiamine on agar plates.
  • Quantified intracellular thiamine levels in selected isolates.

    • Main Results:

    • Nine microbial cultures were confirmed to excrete thiamine.
    • Several isolates demonstrated significantly higher intracellular thiamine concentrations compared to the general population.
    • Thiamine-requiring strains of Saccharomyces cerevisiae and S. uvarum were identified and assigned to 10 complementation groups.

    Conclusions:

    • The study successfully identified novel thiamine-excreting and overproducing yeast and fungal strains.
    • These findings highlight the potential of microbial resources for thiamine production.
    • Further research into the genetic and metabolic pathways of these isolates could optimize thiamine biosynthesis.