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Updated: Aug 15, 2026
Isolating Interaction-Null/Impaired Mutants Using the Yeast Two-Hybrid Assay
Published on: December 29, 2023
Identification of novel binding partners for tuberous sclerosis complex 2 (TSC2) by yeast two-hybrid approach
O M Malanchuk1, V Pozur, G G Panasyuk
1The Institute of Molecular Biology and Genetics, Kyiv 03143, Ukraine.
Aim:
To identify novel tuberous sclerosis complex (TSC2) binding partners by yeast two-hybrid screening.
Methods:
The yeast two-hybrid system DupLEX-A developed by OriGene Technologies and Mouse embryo and HeLa cells cDNA libraries were used in this study. The "bait" constructs, containing full-length and truncated form of TSC2 were prepared. The expression of all constructs in yeast was confirmed by immunoblotting with specific anti-LexA antibodies. The suitability of generated constructs for screening was tested in autoactivation and nuclear translocation assays. Screening of mouse embryo and HeLa cDNA libraries with selected baits was carried out according to manufacturer's recommendations. Positive clones were selected using double selection procedure and further confirmed in mating assay. Isolated cDNA clones were identified by automated DNA sequencing and database searching.
Results:
Extensive screening of two cDNA libraries from mouse embryo and HeLa cells with TSC2 baits led to the isolation of 102 positives clones. The specificity of interaction between TSC2 and binding proteins of selected clones was confirmed by mating assay for 83 clones. Sequencing of these clones indicated that they encode already known and novel TSC2-binding partners.
Conclusion:
The isolation of several known TSC2-binding partners, such as several isoforms of 14-3-3, demonstrates the validity of generated bait constructs and screening conditions. In addition, we have found a number of novel interactors, which encode cytoskeletal proteins and signaling molecules, such as Ser/Thr phosphatases.
Insights
Researchers identified new tuberous sclerosis complex 2 (TSC2) binding partners using yeast two-hybrid screening. This study reveals novel cytoskeletal proteins and signaling molecules interacting with TSC2.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Tuberous sclerosis complex (TSC2) is a tumor suppressor gene.
- Understanding TSC2 interactions is crucial for disease research.
Purpose of the Study:
- To discover novel protein interactors of tuberous sclerosis complex 2 (TSC2).
- To identify new binding partners for TSC2 using a yeast two-hybrid system.
Main Methods:
- Yeast two-hybrid screening employing mouse embryo and HeLa cell cDNA libraries.
- Construction and validation of TSC2 "bait" constructs.
- Confirmation of positive clones through mating assays and DNA sequencing.
Main Results:
- Isolation of 102 positive clones after screening.
- Confirmation of interaction specificity for 83 clones.
- Identification of both known (e.g., 14-3-3 isoforms) and novel TSC2 binding partners.
Conclusions:
- The study successfully validated the yeast two-hybrid screening approach for TSC2 interactors.
- Novel TSC2 binding partners, including cytoskeletal proteins and Ser/Thr phosphatases, were identified.
- These findings expand the understanding of TSC2's molecular interactions and cellular functions.
