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Updated: May 16, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
TIP30 directly binds p53 tumor suppressor protein in vitro
Si-Hyung Lee1, Sung-Kyu Ju, Tae-Young Lee
1Biomedical Translational Research Center, Division of Convergent Biomedical Research, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Korea.
The tumor suppressor TIP30 (30 kDa HIV-1 TAT-interacting protein) directly binds to the DNA-binding and C-terminal domains of the p53 protein. This interaction may influence p53 levels and its role in cancer suppression.
Area of Science:
- Molecular Biology
- Cancer Research
- Protein Interactions
Background:
- TIP30 (30 kDa HIV-1 TAT-interacting protein) is a tumor suppressor and angiogenesis inhibitor.
- TIP30 influences the tumor suppressor p53 levels via post-transcriptional regulation of HuR.
- The direct interaction between TIP30 and p53 has been proposed but not experimentally verified.
Purpose of the Study:
- To investigate the direct physical interaction between TIP30 and p53.
- To identify the specific domains of p53 that interact with TIP30.
Main Methods:
- GST pull-down assay to detect protein-protein interactions.
- Surface plasmon resonance (SPR) to quantify the binding kinetics between TIP30 and p53 domains.
Main Results:
- TIP30 directly binds to p53.
- TIP30 specifically interacts with the DNA-binding domain of p53.
- TIP30 also binds to the C-terminal domain of p53.
Conclusions:
- TIP30 interacts directly with key functional domains of p53.
- These findings suggest a novel mechanism for TIP30 in regulating p53 activity.
- The direct interaction may contribute to TIP30's tumor suppressor functions.
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