Numb functions as a tumour suppressor protein by regulating another tumour suppressor, p53. Numb binds and inhibits the activity of the ubiquitin ligase HDM2, and thereby promotes p53 stability and function. Low levels of Numb expression in breast tumours is associated with a poor prognosis.
- Ivan N. Colaluca
- Daniela Tosoni
- Pier Paolo Di Fiore