Interaction of c-Abl and p73a and their collaboration to induce apoptosis

            Reuven Agami, Giovanni Blandino, Moshe Oren, Yosef Shaul

Nature  399, 809-813 (1999)


    c-Abl, a non-receptor tyrosine kinase, is activated by agents that damage DNA. This activation results in either arrest of the cell cycle in phase G1 or apoptotic cell death, both of which are dependent on the kinase activity of c-Abl. p73, a member of the p53 family of tumour-suppressor proteins, can also induce apoptosis. They show that the apoptotic activity of p73a requires the presence of functional, kinase-competent c-Abl. Furthermore, p73 and c-Abl can associate with each other, and this binding is mediated by a PxxP motif in p73 and the SH3 domain of c-Abl. They find that p73 is a substrate of the c-Abl kinase and that the ability of c-Abl to phosphorylate p73 is markedly increased by g-irradiation. Moreover, p73 is phosphorylated in vivo in response to ionizing radiation. These findings define a pro-apoptotic signaling pathway involving p73 and c-Abl.


Kharbanda, S., Yuan, Z. M., Weichselbaum, R.& Kufe, D., Determination of cell fate by c-abl activation in the response to DNA damage. Oncogene 17 ,3309-3318 (1997)

Gong JG, Costanzo A, Yang HQ, Melino G, Kaelin WG Jr, Levrero M, Wang JY. 1999. The tyrosine
kinase c-Abl regulates p73 in apoptotic response to cisplatin-induced DNA damage. Nature. 399:

Yuan ZM, Shioya H, Ishiko T, Sun X, Gu J, Huang YY, Lu H, Kharbanda S, Weichselbaum R, Kufe D.
1999. p73 is regulated by tyrosine kinase c-Abl in the apoptotic response to DNA damage. Nature. 399: