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Updated: Nov 18, 2025

Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter
Published on: March 27, 2020
Pin1 and JNK1 cooperatively modulate TAp63γ.
Xueying Fan1, Wei He2, Ke Hu1
1Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China.
The peptidyl-prolyl isomerase (PPI) Pin1 protein binds to the TAp63γ transcription factor, enhancing its activity. This interaction, dependent on JNK1 phosphorylation, reveals a novel regulatory mechanism for TAp63γ transactivity.
Area of Science:
- Molecular Biology
- Gene Regulation
- Protein Interactions
Background:
- The p63 gene produces multiple isoforms, including TAp63γ, a key transcription factor.
- Previous work identified Pin1 binding to TAp63γ and the importance of serine 12 (S12) for its transcriptional regulation.
Purpose of the Study:
- To investigate the role of Pin1 and JNK1 in modulating TAp63γ transcriptional and pro-apoptotic activities.
- To elucidate the novel mechanism regulating TAp63γ transactivity.
Main Methods:
- Investigated the interaction between Pin1, TAp63γ, and JNK1.
- Analyzed the effect of S12 phosphorylation and Pin1 binding on TAp63γ activity.
Main Results:
- Pin1 significantly stimulates the transcriptional and pro-apoptotic functions of TAp63γ.
- JNK1-mediated phosphorylation of S12 is crucial for Pin1-dependent TAp63γ activation.
- A novel regulatory model: unphosphorylated S12 leads to moderate activity, pS12 causes hypoactivity, and Pin1 binding to pS12-P13 results in hyperactivity.
Conclusions:
- Pin1 acts as a critical positive regulator of TAp63γ activity through a phosphorylation-dependent mechanism.
- This study uncovers a new pathway for controlling TAp63γ function, impacting gene regulation and apoptosis.
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