Related Experiment Video
Updated: Jun 18, 2026
14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Regulation of p53--insights into a complex process
Karen A Boehme1, Christine Blattner
1Forschungszentrum Karlsruhe, Institute of Toxicology and Genetics, Karlsruhe, Germany.
Critical Reviews in Biochemistry and Molecular Biology
|November 26, 2009
Summary
The p53 protein, a key tumor suppressor, becomes active upon cellular stress like DNA damage. Its activity and abundance are tightly regulated by various modifications and interactions, crucial for preventing cancer.
Area of Science:
- Molecular Biology
- Cancer Research
- Cellular Signaling
Background:
- The p53 protein is a critical tumor suppressor involved in cellular responses to stress.
- p53 exists in a latent state but is rapidly activated by DNA damage, hypoxia, or nucleotide depletion.
- Its functions include initiating transcription of genes that induce apoptosis and cell cycle arrest.
Purpose of the Study:
- To review the current understanding of p53 protein regulation.
- To summarize the known mechanisms controlling p53 abundance and activity.
- To highlight the continuous discovery of p53 modifications and interaction partners.
Main Methods:
- Literature review of p53 research over the past 30 years.
- Synthesis of findings on p53 regulation, including post-translational modifications and interaction partners.
- Analysis of how these factors modulate p53's abundance and activity.
Main Results:
- p53 activity is modulated through intricate regulation of both protein levels and post-translational modifications.
- Numerous modifications and interaction partners have been identified that influence p53's tumor-suppressive functions.
- Ongoing research continues to uncover novel regulatory mechanisms for p53.
Conclusions:
- The regulation of p53 abundance and activity is complex and multifaceted.
- Understanding these regulatory networks is essential for developing targeted cancer therapies.
- Continued investigation into p53 modulation holds promise for advancing cancer treatment strategies.
Related Concept Videos
01:23Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
02:23Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
01:19Interactions Between Signaling Pathways
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
02:04Covalently Linked Protein Regulators
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.
These groups modify specific amino acids in a protein.
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...