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Related Experiment Videos

Yeast flocculation: reconciliation of physiological and genetic viewpoints.

M Stratford1

  • 1AFRC Institute of Food Research, Norwich, U.K.

Yeast (Chichester, England)
|January 1, 1992
PubMed
Summary
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Yeast flocculation, a process involving cell wall lectins binding to sugars, is complex. New research suggests regulatory genes control a common structural gene for mannose-specific flocculation.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Yeast flocculation is a crucial trait for brewing and biotechnology.
  • Previous studies suggested multiple genetic mechanisms for flocculation, contrasting with physiological and biochemical findings.

Purpose of the Study:

  • To reconcile conflicting data on yeast flocculation mechanisms.
  • To propose a unified hypothesis integrating genetic, physiological, and biochemical evidence.
  • To elucidate the roles of specific genes and cellular processes in yeast cell aggregation.

Main Methods:

  • Review and integration of existing biochemical, physiological, and genetic data on yeast flocculation.
  • Analysis of sugar inhibition studies to identify flocculation phenotypes.

Related Experiment Videos

  • Examination of genetic loci (FLO1, FLO5, FLO8, TUP1, CYC8) associated with flocculation.

    • Main Results:

    • Two lectin phenotypes were identified: gluco-mannospecific (NewFlo) and mannose-specific (Flo1).
    • Mannose-specific flocculation (Flo1) is associated with genes FLO1, FLO5, and FLO8, and mutations in TUP1 or CYC8.
    • A common structural gene for mannose-specific flocculation is proposed, with FLO1, FLO5, and FLO8 acting as positive regulatory genes.

    Conclusions:

    • Yeast flocculation is mediated by lectin-carbohydrate interactions on cell walls.
    • FLO1, FLO5, and FLO8 likely regulate a ubiquitous structural gene for mannose-specific flocculation.
    • Mutations in the secretory pathway can suppress flocculation, and killer L double-stranded RNA may be involved.