Mdm2 binds p73 alpha without targeting degradation

Related Experiment Video

Updated: Oct 19, 2026

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence
04:56

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence

Published on: December 30, 2025

E Bálint1, S Bates, K H Vousden

  • 1ABL Basic Research Program, NCI-FCRDC, Frederick, Maryland, 21702-1202, USA.

Oncogene
|August 6, 1999
PubMed

Insights

The tumor suppressor p73 alpha interacts with Mdm2, but unlike p53, it is not degraded. This interaction inhibits p73 alpha

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Tumor Suppressor Proteins

Background:

  • The p53 tumor suppressor protein's function is regulated by Mdm2, leading to its degradation.
  • Understanding the regulation of related proteins like p73 alpha is crucial for cancer research.

Purpose of the Study:

  • To investigate the interaction between p73 alpha and Mdm2.
  • To determine if Mdm2 binding affects p73 alpha stability and function.
  • To compare the regulatory mechanisms of p73 alpha and p53.

Main Methods:

  • In vitro binding assays.
  • Cellular interaction studies.
  • Analysis of protein degradation pathways.
  • Transcriptional activity assays.

Main Results:

  • p73 alpha forms an interaction with Mdm2 in vitro and in cells.
  • This interaction does not lead to the degradation of p73 alpha.
  • Human papillomavirus E6 protein also fails to degrade p73 alpha.
  • Mdm2 binding impedes p73 alpha's transcriptional function despite the absence of degradation.

Conclusions:

  • p73 alpha stability is regulated by mechanisms distinct from p53.
  • Mdm2 interaction with p73 alpha inhibits its transcriptional activity without causing degradation.
  • These findings shed light on the unique regulatory pathways of p73 alpha in cancer.

More Related Videos

Purification of Ubiquitinated p53 Proteins from Mammalian Cells10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Yeast As a Chassis for Developing Functional Assays to Study Human P5314:57

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

Published on: August 4, 2019

Related Concept Videos

Abnormal Proliferation02:23

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...
Negative Regulator Molecules01:23

Negative 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.
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

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...
Covalently Linked Protein Regulators02:04

Covalently 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.
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...