Chen Shih-Shun, Chang Pi-Chu, Cheng Yu-Wen, Tang Fen-Mei, Lin Young-Sun
Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan.
EMBO J. 2002 Sep 2;21(17):4491-9. doi: 10.1093/emboj/cdf409.
Using a transactivation-defective p53 derivative as bait, STK15, a centrosome-associated oncogenic serine/threonine kinase, was isolated as a p53 partner. The p53-STK15 interaction was confirmed further by co-immunoprecipitation and GST pull-down studies. In co-transfection experiments, p53 suppressed STK15-induced centrosome amplification and cellular transformation in a transactivation-independent manner. The suppression of STK15 oncogenic activity by p53 might be explained in part by the finding that p53 inhibited STK15 kinase activity via direct interaction with the latter's Aurora box. Taken together, these findings revealed a novel mechanism for the tumor suppressor function of p53.
利用一种转录激活缺陷型p53衍生物作为诱饵,分离出一种与中心体相关的致癌性丝氨酸/苏氨酸激酶STK15作为p53的结合蛋白。通过免疫共沉淀和GST沉降实验进一步证实了p53与STK15的相互作用。在共转染实验中,p53以不依赖转录激活的方式抑制STK15诱导的中心体扩增和细胞转化。p53对STK15致癌活性的抑制作用,部分原因可能是p53通过与STK15的Aurora框直接相互作用抑制了其激酶活性。综上所述,这些发现揭示了p53肿瘤抑制功能的一种新机制。