MDM2 Peptide - Middle Region Blocking Peptide

This gene encodes a nuclear-localized E3 ubiquitin ligase. The encoded protein can promote tumor formation by targeting tumor suppressor proteins, such as p53, for proteasomal degradation. This gene is itself transcriptionally-regulated by p53. Overexpression or amplification of this locus is detected in a variety of different cancers. There is a pseudogene for this gene on chromosome 2. Alternative splicing results in a multitude of transcript variants, many of which may be expressed only in tumor cells. [provided by RefSeq, Jun 2013]

MDM2: a ubiquitin ligase for p53, plays a central role in regulation of the stability of p53 via Akt-mediated MDM2 phosphorylation. Phosphorylation of MDM2 increases its interaction with p300, providing a platform to allow the assembly of the protein complex necessary for MDM2-mediated ubiquitination and degradation of p53. Phosphorylation of MDM2 also blocks its binding to p19ARF, increasing the degradation of p53. Facilitates the nuclear export of p53 and targets it for proteasome-mediated proteolysis. Eight alternatively spliced isoforms have been reported.

Protein type: Ligase; EC 6.3.2.19; EC 6.3.2.-; Ubiquitin ligase; Oncoprotein; Inhibitor; Ubiquitin conjugating system; Nucleolus

Chromosomal Location of Human Ortholog: 12q14.3-q15

Cellular Component: nucleoplasm; nuclear body; protein complex; cytoplasm; nucleolus; plasma membrane; synapse; cytosol; nucleus

Molecular Function: identical protein binding; protein binding; peroxisome proliferator activated receptor binding; enzyme binding; zinc ion binding; p53 binding; ubiquitin protein ligase binding; ubiquitin-protein ligase activity; ligase activity

Biological Process: viral reproduction; nerve growth factor receptor signaling pathway; protein ubiquitination during ubiquitin-dependent protein catabolic process; protein ubiquitination; response to morphine; negative regulation of caspase activity; negative regulation of transcription from RNA polymerase II promoter; positive regulation of mitotic cell cycle; DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest; response to carbohydrate stimulus; response to antibiotic; positive regulation of protein export from nucleus; synaptic transmission; negative regulation of DNA damage response, signal transduction by p53 class mediator; response to magnesium ion; establishment of protein localization; peptidyl-lysine modification; positive regulation of cell proliferation; protein complex assembly; response to iron ion; epidermal growth factor receptor signaling pathway; response to drug; traversing start control point of mitotic cell cycle; phosphoinositide-mediated signaling; fibroblast growth factor receptor signaling pathway; protein destabilization; response to ether; response to cocaine; positive regulation of proteasomal ubiquitin-dependent protein catabolic process; innate immune response; regulation of protein catabolic process; negative regulation of transcription, DNA-dependent

Disease: Accelerated Tumor Formation, Susceptibility To