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Related Experiment Videos

RAP1: a protean regulator in yeast

D Shore1

  • 1Department of Microbiology, College of Physicians and Surgeons of Columbia University, New York, NY 10032.

Trends in Genetics : TIG
|November 1, 1994
PubMed
Summary
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The yeast protein RAP1 is crucial for cell survival, acting as a transcription regulator at various DNA sites. Its function as an activator or repressor depends on binding context and protein interactions.

Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Epigenetics

Background:

  • The yeast protein RAP1 is a sequence-specific DNA-binding protein.
  • RAP1 binds to promoters, mating-type gene silencers, and telomeric [(C)1-3A]n tracts.
  • RAP1 is essential for yeast cell viability.

Purpose of the Study:

  • To investigate the dual role of RAP1 as a transcriptional activator and repressor.
  • To explore how protein-protein interactions influence RAP1 function.
  • To understand RAP1's role in telomere structure and silencing.

Main Methods:

  • Sequence-specific DNA-binding assays.
  • Analysis of protein-protein interactions.
  • Functional studies in yeast (e.g., transcription assays, telomere position effect analysis).

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Main Results:

  • RAP1 functions as both an activator and repressor of transcription.
  • RAP1's function is context-dependent, influenced by its binding site.
  • Distinct protein-protein interactions mediate RAP1's roles at promoters and silencers.
  • RAP1 is critical for telomere position effect and telomere structure.

Conclusions:

  • RAP1's regulatory activity is modulated by specific protein interactions.
  • Understanding RAP1's diverse functions is key to comprehending gene regulation and genome stability in yeast.