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The RITE assay: identifying effectors that target the transcription machinery using phage display technology.
J M Mazzarelli1, R P Ricciardi
1University of Pennsylvania, Philadelphia, PA, USA.
Biotechniques
|March 10, 2001
Summary
Researchers developed a new assay to find transcription activators and repressors. This method, the reverse identification of transcriptional effectors (RITE) assay, directly identifies proteins that interact with transcription machinery.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Transcription regulation involves complex interactions between general transcription factors and various effector proteins.
- Identifying these effectors is crucial for understanding gene expression control.
- Existing methods like the yeast two-hybrid system have limitations in identifying transcription factor interactions.
Purpose of the Study:
- To introduce a novel assay, the reverse identification of transcriptional effectors (RITE) assay, for identifying transcription activators and repressors.
- To demonstrate the utility of phage display for discovering novel protein-protein interactions within the transcription machinery.
- To provide a method that directly measures interactions with specific transcription factor components.
Main Methods:
- Utilizing phage display to screen a library of cDNA-encoded peptides against specific regions of general transcription factors.
- Determining the amino acid sequence of interacting phage-displayed peptides.
- Performing database homology searches to identify potential effector proteins.
- Synthesizing candidate effectors and validating their binding and functional activity in vivo.
Main Results:
- The RITE assay successfully identifies proteins that interact with targeted components of the general transcription machinery.
- Homology searches enable the identification of known or novel transcription factors.
- Validated candidate effectors demonstrate binding to target proteins and modulate transcription in vivo.
Conclusions:
- The RITE assay is an effective method for identifying transcription effectors by directly targeting transcription machinery components.
- This approach offers advantages over existing methods like the yeast two-hybrid system for studying transcription factor interactions.
- The RITE assay facilitates the discovery of novel regulators of transcription.