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The Journal of Biological Chemistry
Year: 2008  |  Volume: 283  |  Issue: 24  |  Page No.: 16416 - 16426

RACK1 and CIS Mediate the Degradation of BimEL in Cancer Cells

Weizhou Zhang, George Zhi Cheng, Jianli Gong, Ulrich Hermanto, Cong Susan Zong, Joseph Chan, Jin Quan Cheng and Lu- Hai Wang    

Abstract: RACK1 is a 7-WD motif-containing protein with numerous downstream effectors regulating various cellular functions. Using a yeast two-hybrid screen, we identified dynein light chain 1 as a novel interacting partner of RACK1. Additionally, we demonstrated that RACK1 formed a complex with DLC1 and Bim, specifically BimEL, in the presence of apoptotic agents. Upon paclitaxel treatment, RACK1, DLC1, and CIS mediated the degradation of BimEL through the ElonginB/C-Cullin2-CIS ubiquitin-protein isopeptide ligase complex. We further showed that RACK1 conferred paclitaxel resistance to breast cancer cells in vitro and in vivo. Finally, we observed an inverse correlation between CIS and BimEL levels in both ovarian and breast cancer cell lines and specimens. Our study suggests a role of RACK1 in protecting cancer cells from apoptosis by regulating the degradation of BimEL, which together with CIS could play an important role of drug resistance in chemotherapy.

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