Murine double minute 2 homolog (MDM2)

Murine double minute 2 homolog (MDM2) is a critical negative regulator of the p53 tumor suppressor protein, acting primarily as an E3 ubiquitin ligase. By binding to the N-terminal transactivation domain of p53, MDM2 inhibits its transcriptional activity and facilitates its polyubiquitination, leading to proteasomal degradation. This interaction forms an essential autoregulatory feedback loop where p53 induces the expression of MDM2, which in turn limits p53 levels to prevent inappropriate cell cycle arrest or apoptosis in healthy cells. In many human cancers, particularly soft tissue sarcomas and certain leukemias, MDM2 is frequently overexpressed or the gene is amplified, resulting in the constitutive inactivation of wild-type p53 and promoting uncontrolled cell proliferation. Consequently, MDM2 has emerged as a high-priority therapeutic target in oncology. Small molecule inhibitors, such as the Nutlin derivatives and various "madlin" compounds, are designed to occupy the hydrophobic p53-binding pocket of MDM2. These drugs effectively displace p53, allowing it to accumulate and reactivate its tumor-suppressive functions, including the induction of apoptosis in malignant cells.

Other names

E3 ubiquitin-protein ligase Mdm2HDM2MDM2 proto-oncogenep53-binding protein Mdm2Double minute 2 proteinOncoprotein Mdm2

MDM2-p53 interaction inhibition (disruption of the p53-binding pocket), E3 ubiquitin ligase inhibition