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Glucose repression in fungi

H Ronne1

  • 1Ludwig Institute for Cancer Research, Uppsala Biomedical Center, Sweden.

Trends in Genetics : TIG
|January 1, 1995
PubMed
Summary

Glucose represses genes for alternative carbon sources in eukaryotes via a mechanism distinct from bacteria. Zinc finger proteins like Mig1 and CREA binding GC-boxes are crucial for this glucose repression.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Glucose is a primary carbon source that regulates gene expression in many organisms.
  • Eukaryotic glucose repression mechanisms differ from those in prokaryotes.
  • Specific transcription factors mediate glucose-mediated gene silencing.

Purpose of the Study:

  • To elucidate the molecular mechanisms of glucose repression in eukaryotic organisms.
  • To identify key proteins involved in regulating genes for alternative carbon source metabolism.
  • To compare fungal glucose repression pathways with bacterial systems.

Main Methods:

  • Analysis of gene expression patterns in yeast and filamentous fungi.
  • Identification and characterization of transcription factors binding to GC-box DNA sequences.
  • Biochemical assays to confirm protein-DNA interactions.

Main Results:

  • A distinct eukaryotic pathway for glucose repression was identified in yeast and fungi.
  • Zinc finger proteins, including Mig1 and CREA, were found to bind GC-boxes.
  • These proteins play a critical role in mediating the repression of genes for alternative carbon metabolism.

Conclusions:

  • Glucose repression in eukaryotes involves specific zinc finger proteins that bind GC-boxes.
  • This mechanism differs significantly from bacterial glucose repression strategies.
  • Understanding these pathways is vital for metabolic engineering and fungal biotechnology.

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