Related Experiment Video

Updated: Aug 29, 2026

Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications
10:12

Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications

Published on: April 21, 2023

Posttranslational modification of MDM2

David W Meek1, Uwe Knippschild

  • 1Biomedical Research Centre, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, Scotland, United Kingdom. meek@cancer.org.uk

Molecular Cancer Research : MCR
|January 7, 2004
PubMed

Insights

Posttranslational modifications like sumoylation and phosphorylation regulate MDM2 protein functions, including its E3 ubiquitin ligase activity and interactions with growth-regulating proteins. These modifications are crucial for cellular stress responses and survival.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • MDM2 protein is a key regulator of cell growth and survival.
  • MDM2's functions are influenced by posttranslational modifications.
  • Understanding these modifications is crucial for comprehending cellular stress responses.

Purpose of the Study:

  • To review the current knowledge on posttranslational modifications of MDM2.
  • To elucidate the functional relevance of these modifications on MDM2 activity and localization.
  • To explore how these modifications impact MDM2-mediated ubiquitination and protein interactions.

Main Methods:

  • Literature review of studies on MDM2 posttranslational modifications.
  • Analysis of sumoylation and multisite phosphorylation effects on MDM2.
  • Examination of MDM2's role in ubiquitination of p53 and autoubiquitination.

Main Results:

  • Sumoylation and multisite phosphorylation modulate MDM2's E3 ubiquitin ligase activity.
  • These modifications regulate MDM2's subcellular localization and protein-protein interactions.
  • Posttranslational modifications differentiate p53 ubiquitination from MDM2 autoubiquitination.

Conclusions:

  • Posttranslational modifications are critical regulators of MDM2 protein function.
  • These modifications integrate stress responses with cell survival mechanisms.
  • Further research into MDM2 modifications can reveal therapeutic targets for growth-related disorders.

More Related Videos

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images09:42

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

Published on: September 7, 2017

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...
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...
Nuclear Export of mRNA02:31

Nuclear Export of mRNA

Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
M-Cdk Drives Transition Into Mitosis02:15

M-Cdk Drives Transition Into Mitosis

Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...