P53 Protein
P53 Protein - Related Videos
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.
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.
02:04
Covalently Linked Protein Regulators
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2020
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified. These groups modify specific amino acids in a protein.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
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.
FAQs
MDM2 keeps p53 protein levels low by targeting the protein for degradation under normal cellular conditions. This restraint prevents unnecessary activation of p53-controlled stress responses when the cell is not experiencing damage or other threats. If the MDM2-p53 regulatory pathway becomes disrupted, p53 regulation can fail, weakening an important mechanism of genome protection.
After cellular stress stabilizes p53, the protein binds specific DNA sequences and regulates sets of target genes. The resulting response depends on which protective program is activated, including temporary cell-cycle arrest, DNA repair, cellular senescence, or apoptosis. These alternatives allow cells either to pause and address damage or to eliminate cells whose damage cannot be safely resolved.
Disruption of the MDM2-p53 pathway can prevent appropriate accumulation or activity of p53 after DNA damage, oncogene activation, or related stress. Cells may then fail to pause their cycle, repair damaged DNA, enter senescence, or undergo apoptosis. By weakening these safeguards, pathway disruption can impair genome protection and support the development of cancerous cells.
The overview identifies DNA damage, oncogene activation, and other cellular stresses as signals that can stabilize p53. These signals connect potentially harmful changes inside a cell to transcriptional responses that restrict proliferation or remove severely damaged cells. Examining how p53 responds to these distinct stress conditions helps clarify how cells coordinate genome protection.
Studying p53 protein function can help identify diagnostic markers associated with impaired tumor-suppressive responses. Because p53 connects cellular stress with cell-cycle control, DNA repair, senescence, and apoptosis, changes in this regulatory system may provide information about how cells respond to cancer-related damage. Such research contributes to understanding cancer development and supports investigation of clinically relevant markers.
p53 protein research informs therapeutic strategies that aim to restore or enhance tumor-suppressive responses. Understanding its regulation, including the role of MDM2-mediated degradation, can help researchers examine why stress responses fail and how they might be strengthened. This work connects molecular biology with efforts to develop treatments that improve the cell's ability to control damaged or abnormal cells.