Related Experiment Video

Updated: May 18, 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

MDM2 and MDMX: Alone and together in regulation of p53

Miriam Shadfan1, Vanessa Lopez-Pajares, Zhi-Min Yuan

  • 1Department of Cellular and Structural Biology and Department of Radiation Oncology, University of Texas Health Science Center San Antonio, San Antonio, TX, USA.

Translational Cancer Research
|September 25, 2012
PubMed

Insights

The tumor suppressor p53 is regulated by MDM2 and MDMX. These proteins form a complex to inhibit p53, and understanding this interaction is key to cancer research.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • p53 is a critical tumor suppressor that halts cell cycle progression or induces apoptosis in response to cellular stress.
  • MDM2 and MDMX are the primary negative regulators of p53, suppressing its activity in normal cells.
  • Dysregulation of p53 activity is a hallmark of many cancers.

Purpose of the Study:

  • To provide an overview of MDM2 and MDMX, the key negative regulators of p53.
  • To discuss the mechanisms by which MDM2 and MDMX are modified to allow p53 activation.
  • To explore the non-redundant roles of MDM2 and MDMX in p53 regulation.

Main Methods:

  • Literature review of existing studies on p53, MDM2, and MDMX.
  • Analysis of the interaction and complex formation between MDM2 and MDMX.
  • Discussion of post-translational modifications affecting MDM2 and MDMX function.

Main Results:

  • MDM2 and MDMX form a complex that is essential for the effective inhibition of p53.
  • MDM2 and MDMX play multifaceted and non-redundant roles in modulating p53 activity.
  • Modifications to MDM2 and MDMX are crucial for p53 activation in response to cellular stress.

Conclusions:

  • The MDM2-MDMX complex is the primary functional unit for p53 inhibition.
  • Investigating MDM2 and MDMX requires consideration of their complex as a whole.
  • Understanding the regulation of the MDM2-MDMX complex is vital for therapeutic strategies targeting p53.

More Related Videos

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay05:17

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay

Published on: February 9, 2021

Purification of Ubiquitinated p53 Proteins from Mammalian Cells10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

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...
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.
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...
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...