The mitotic kinase Polo regulates the asymmetric localization of the tumour-suppressor protein Numb through phosphorylating Pon, the adaptor protein for Numb, and Polo acts as a tumour-suppressor through regulating Pon/Numb. This provides the first direct biochemical link between the cell cycle and asymmetric protein localization machinery and reveals a novel mechanism underlying the tumour suppressor function of Polo.
- Hongyan Wang
- Yingshi Ouyang
- Bingwei Lu