西亚试剂：CDC2-mediated phosphorylation of clip-170 is essential for

CDC2-mediated phosphorylation of clip-170 is essential for its inhibition of centrosome reduplication

Xiaoming Yang1, Hongchang Li2, Anping Deng1 and Xiaoqi Liu2,*

1 Sichuan University, China;
2 Purdue University, United States

CLIP-170, the founding member of microtubule plus ends tracking proteins, is involved in many critical microtubule-related functions, including recruitment of dynactin to the microtubule plus ends, and formation of kinetochore-microtubule attachments during metaphase. Although it has been reported that CLIP-170 is a phosphoprotein, neither have individual phosphorylation sites been identified nor have the associated kinases been extensively studied. Herein, we identify Cdc2 as a kinase that phosphorylates CLIP-170. We show that Cdc2 interacts with CLIP-170 mediating its phosphorylation on Thr287 in vivo. Significantly, expression of CLIP-170 with a threonine 287 to alanine substitution (T287A) results in its mis-localization, accumulation of Plk1 and cyclin B, and block of the G2/M transition. Finally, we found that depletion of CLIP-170 leads to centrosome reduplication and that Cdc2 phosphorylation of CLIP-170 is required for the process. These results demonstrate that Cdc2-mediated phosphorylation of CLIP-170 is essential for the normal function of this protein during cell cycle progression.

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