P53 Transactivation
P53 Transactivation - Related Videos
04:56
Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence
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2025
Hs578T breast cancer cells harboring the p53 V157F mutation exhibit significantly higher Thioflavin T fluorescence compared to MCF7 cells, indicating enhanced protein aggregation. Multipoint fluorescence measurements improve detection accuracy and reliability in identifying β-sheet-rich aggregates, underscoring the importance of aggregation-prone p53 mutations in cancer research and the development of therapeutic strategies.
08:00
Screening for Endocrine Activity in Water Using Commercially-available In Vitro Transactivation Bioassays
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Cited by 12 •
2016
A protocol to screen for endocrine activity in organic extracts of water samples, including treated wastewater effluent and surface (receiving) water, was adapted using commercially available division-arrested ("freeze and thaw") in vitro transactivation bioassays.
10:55
Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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Cited by 1 •
2022
The protocol describes a step-by-step method to purify ubiquitinated proteins from mammalian cells using the p53 tumor suppressor protein as an example. Ubiquitinated p53 proteins were purified from cells under stringent nondenaturing and denaturing conditions.
17:59
Derivation of Thymic Lymphoma T-cell Lines from Atm-/- and p53-/- Mice
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Cited by 11 •
2011
In this video we demonstrate a protocol to establish mouse thymic lymphoma cell lines. By following this protocol, we have successfully established several T-cell lines from Atm-/- and p53-/- mice with thymic lymphoma.
14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Cited by 16 •
2019
Presented here are four protocols to construct and exploit yeast Saccharomyces cerevisiae reporter strains to study human P53 transactivation potential, impacts of its various cancer-associated mutations, co-expressed interacting proteins, and the effects of specific small molecules.
FAQs
Stress signals such as DNA damage can stabilize p53 and induce modifications that support its activity. These changes help determine whether sufficient p53 is available to engage target gene promoters and initiate transcription. In cancer research, examining this stabilization and modification step helps explain why cells may fail to activate protective gene-expression programs after cellular stress.
Response elements in target gene promoters provide the DNA sites recognized by p53. After binding, p53 recruits transcriptional coactivators and chromatin-modifying proteins, which help initiate gene expression at those promoters. This coordinated interaction connects p53 recognition of specific genomic sequences with the activation of genes that control subsequent cellular responses.
The consequences depend on cellular context rather than on promoter binding alone. A p53-driven program may favor cell-cycle arrest, DNA repair, senescence, or apoptosis, depending on the circumstances of the cell and the stress response. This context dependence makes transactivation outcomes important when interpreting p53 activity in cancer models.
Mutations can interfere with the tumor-suppressive programs normally associated with p53 transactivation. When p53 activity is altered, target-gene expression may no longer support appropriate cell-cycle arrest, DNA repair, senescence, or apoptosis. Studying these disruptions allows cancer researchers to connect changes in p53 function with impaired tumor suppression in experimental systems.
Researchers examine p53 transactivation to evaluate whether p53 is functionally active in an experimental model and whether stress produces the expected gene-expression response. These studies can also reveal how particular mutations affect tumor-suppressive signaling. The resulting information helps compare cellular responses and interpret whether a model reflects intact or disrupted p53 function.
Because transactivation controls gene programs linked to cell-cycle arrest, DNA repair, senescence, and apoptosis, it provides a framework for investigating ways to restore or enhance p53 function. Cancer research can use this framework to evaluate strategies aimed at recovering effective tumor suppression or strengthening responses to cellular stress in relevant experimental models.