MDM2（MDM2 proto-oncogene） 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. MDM2 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 MDM2 on chromosome 2. Alternative splicing results in a multitude of transcript variants, many of which may be expressed only in tumor cells.蛋白别名为：E3 ubiquitin-protein ligase Mdm2 (EC 6.3.2.-) (Double minute 2 protein) (Hdm2) (Oncoprotein Mdm2) (p53-binding protein Mdm2);基因ID为：4193；蛋白质ID:Q00987
