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Related Concept Videos

Interactions Between Signaling Pathways01:19

Interactions 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.
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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...
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Abnormal 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...
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The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
DNA Damage Can Stall the Cell Cycle02:36

DNA 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...
DNA Damage can Stall the Cell Cycle02:36

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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...
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Updated: Jun 28, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

The mitochondrial p53 pathway.

Angelina V Vaseva1, Ute M Moll

  • 1Department of Pathology, Stony Brook University, Stony Brook, NY 11794, USA.

Biochimica Et Biophysica Acta
|November 15, 2008
PubMed
Summary
This summary is machine-generated.

The tumor suppressor p53 (also known as TP53) orchestrates cellular responses to stress. Recent research reveals a transcription-independent role for cytoplasmic p53 in inducing apoptosis by interacting with Bcl-2 family proteins.

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • The p53 protein is a critical tumor suppressor frequently mutated in human cancers.
  • p53 traditionally functions as a transcription factor, regulating genes involved in cell cycle arrest, apoptosis, senescence, DNA repair, and genetic stability.
  • Emerging evidence highlights a non-transcriptional role for p53 in apoptosis.

Purpose of the Study:

  • To review the established transcriptional functions of p53.
  • To discuss the recent discoveries of p53's transcription-independent proapoptotic functions.
  • To focus on the mechanisms by which cytoplasmic p53 induces apoptosis.

Main Methods:

  • Literature review of studies on p53 functions.
  • Analysis of research investigating p53's role in apoptosis.
  • Focus on interactions between p53 and Bcl-2 family proteins.

Main Results:

  • p53 is a key regulator of cellular stress responses through transcriptional targets.
  • A significant body of work now demonstrates a transcription-independent proapoptotic function of p53.
  • Cytoplasmic p53 directly engages the intrinsic apoptosis pathway by interacting with Bcl-2 family members, leading to mitochondrial outer membrane permeabilization.

Conclusions:

  • p53's role extends beyond transcription, with critical functions in the cytoplasm.
  • The interaction of cytoplasmic p53 with Bcl-2 proteins is a key mechanism for inducing apoptosis.
  • Understanding both transcriptional and non-transcriptional roles of p53 is crucial for cancer research and therapy.