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TP53 bound to NUMB is active. 1 / 1
1 |

"Numb can actually interact in vivo with endogenous mdm2 and p53, resulting in a trimeric complex between the three proteins [10]. This interaction appears to regulate the stability of p53, as reduction of numb levels by rna interference (rnai) causes a decrease in the half-life of p53 and consequently a reduction in steady-state levels of the protein. Consistent with this observation, overexpression of numb increases the level of p53 in both unstressed and stressed cells."