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In vitro selection of Jun-associated proteins using mRNA display
Kenichi Horisawa1, Seiji Tateyama, Masamichi Ishizaka
1Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan.
Nucleic Acids Research
|December 4, 2004
Summary
mRNA display technology effectively identifies novel protein interactions, overcoming limitations of in vitro methods. This approach aids in mapping protein-protein interactions for comprehensive proteomic analysis.
Area of Science:
- Proteomics
- Molecular Biology
- Biochemistry
Background:
- Traditional methods like yeast two-hybrid assays and mass spectrometry face challenges with living cells, limiting analysis of toxic proteins and interaction conditions.
- In vitro display technologies, including ribosome and mRNA display, offer potential solutions to these limitations.
Purpose of the Study:
- To apply mRNA display for screening protein-protein interactions of the Jun protein basic leucine zipper domain.
- To discover novel Jun-associated proteins using an in vitro screening approach.
Main Methods:
- Utilized mRNA display for iterative affinity selection and sequence analysis against a mouse brain cDNA library.
- Employed real-time PCR and pull-down assays for in vitro validation of identified interactors.
- Used co-immunoprecipitation and subcellular localization studies to confirm interactions in cultured cells.
Main Results:
- Identified 16 novel Jun-associated protein candidates and 4 known interactors.
- Confirmed 10 of the 16 novel candidates as direct in vitro interactors of Jun.
- Validated interaction of 6 of these proteins with Jun in cultured cells.
Conclusions:
- Demonstrated the efficacy of mRNA display technology for discovering novel protein-protein interactions.
- Highlighted the potential of in vitro display for comprehensive mapping of protein-protein interaction networks.
- Showcased a successful application in identifying Jun-interacting proteins from a mouse brain library.