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Related Experiment Videos

A two-hybrid system for transactivator bait proteins.

M Hirst1, C Ho, L Sabourin

  • 1Department of Biochemistry and Molecular Biology; University of British Columbia Vancouver, BC, Canada V6T 1Z3.

Proceedings of the National Academy of Sciences of the United States of America
|July 12, 2001
PubMed
Summary

A novel repressed transactivator (RTA) system uses TUP1 to detect protein interactions. This yeast-based method identifies interactions with transactivator proteins in vivo, offering a versatile tool for molecular biology research.

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Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Protein Interaction Analysis

Background:

  • Two-hybrid systems are crucial for studying protein-protein interactions.
  • Detecting interactions involving transactivator proteins presents unique challenges.
  • Existing methods may have limitations in sensitivity or scope.

Purpose of the Study:

  • To develop a novel two-hybrid strategy for detecting interactions with transactivator proteins.
  • To introduce the repressed transactivator (RTA) system utilizing the TUP1 repression domain.
  • To validate the RTA system's efficacy in identifying and characterizing protein interactions in vivo.

Main Methods:

  • Coexpression of TUP1-GAL80 fusion proteins with GAL4 to inhibit reporter gene transcription.

Related Experiment Videos

  • Utilizing the C-terminal 30 residues of GAL4 for interaction with GAL80.
  • Employing SRB10 in the repression of GAL transcription.
  • Screening a TUP1-cDNA fusion expression library using GAL4-VP16 bait.

    • Main Results:

    • Demonstrated repression of GAL4-dependent reporter genes by TUP1-GAL80 fusion proteins.
    • Confirmed the requirement of GAL4's C-terminal 30 residues for TUP1-GAL80 interaction.
    • Showed that SRB10 is necessary for TUP1-GAL80-mediated repression.
    • Successfully identified interactions between MyoD and E12, and between c-Myc and Bin-1.
    • Identified interacting clones from a cDNA library.

    Conclusions:

    • The repressed transactivator (RTA) system is effective for detecting interactions with transactivator proteins.
    • The RTA system functions similarly to endogenous TUP1 in two-hybrid contexts.
    • RTA is a generally applicable and powerful tool for in vivo protein interaction studies.