Protein-Protein Interactions pp 313-326

Part of the Methods in Molecular Biology book series (MIMB, volume 261)

Reverse Two-Hybrid Techniques in the Yeast Saccharomyces cerevisiae

  • Matthew A. Bennett
  • Jack F. Shern
  • Richard A. Kahn


Use of the yeast two-hybrid system has provided definition to many previously uncharacterized pathways through the identification and characterization of novel protein-protein interactions. The two-hybrid system uses the bi-functional nature of transcription factors, such as the yeast enhancer Gal4, to allow protein-protein interactions to be monitored through changes in transcription of reporter genes. Once a positive interaction has been identified, either of the interacting proteins can mutate, either by site-specific or randomly introduced changes, to produce proteins with a decreased ability to interact. Mutants generated using this strategy are very powerful reagents in tests of the biological significance of the interaction and in defining the residues involved in the interaction. Such techniques are termed reverse two-hybrid methods. We describe a reverse two-hybrid method that generates loss-of-interaction mutations of the catalytic subunit of the Escherichia coli heat-labile toxin (LTA1) with decreased binding to the active (GTP-bound) form of human ARF3, its protein cofactor.

Key Words

Reverse two-hybrid two-hybrid protein interaction loss-of-interaction mutation 


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Copyright information

© Humana Press Inc., Totowa, NJ 2004

Authors and Affiliations

  • Matthew A. Bennett
    • 1
  • Jack F. Shern
    • 1
  • Richard A. Kahn
    • 1
  1. 1.Department of BiochemistryEmory University School of MedicineAtlanta

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