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Glucose repression may involve processes with different sugar kinase requirements

P Sanz1, A Nieto, J A Prieto

  • 1Departmento de Biotecnología de Alimentos, Instituto de Agroquímica yTecnología de Alimentos, Consejo Superior de Investigaciones Cientificas, Valencia, Spain.

Journal of Bacteriology
|August 1, 1996
PubMed
Summary

Glucose addition to Saccharomyces cerevisiae triggers repression. An early step needs any glucose kinase (HXK1, HXK2, GLK1), while a late repression response specifically requires Hxk2p.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Yeast Genetics

Background:

  • Saccharomyces cerevisiae exhibits glucose repression when grown on non-fermentable carbon sources.
  • Glucose repression is a complex regulatory process involving multiple steps.

Purpose of the Study:

  • To elucidate the distinct roles of glucose kinases in the multi-step process of glucose repression in S. cerevisiae.
  • To identify the specific kinase required for the late-acting repression response.

Main Methods:

  • Investigating the effects of glucose addition on S. cerevisiae cultures.
  • Analyzing the requirement of different glucose kinases (HXK1, HXK2, GLK1) for repression.
  • Differentiating between early and late repression responses.

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Main Results:

  • An early glucose repression response can be mediated by any of the three S. cerevisiae glucose kinases: HXK1, HXK2, or GLK1.
  • A late repression response is exclusively dependent on the presence of Hxk2p.

Conclusions:

  • Glucose repression in S. cerevisiae involves distinct early and late phases.
  • Hxk2p plays a critical and specific role in the late stage of glucose repression, independent of other glucose kinases.