Discovery of a molecular glue promoting CDK12-DDB1 interaction to trigger cyclin K degradation
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- Lu Lv
- College of Life Sciences, Beijing Normal University, Beijing, China
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- Peihao Chen
- National Institute of Biological Sciences, Beijing, China
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- Longzhi Cao
- National Institute of Biological Sciences, Beijing, China
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- Yamei Li
- National Institute of Biological Sciences, Beijing, China
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- Zhi Zeng
- National Institute of Biological Sciences, Beijing, China
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- Yue Cui
- College of Life Sciences, Beijing Normal University, Beijing, China
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- Qingcui Wu
- National Institute of Biological Sciences, Beijing, China
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- Jiaojiao Li
- National Institute of Biological Sciences, Beijing, China
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- Jian-Hua Wang
- National Institute of Biological Sciences, Beijing, China
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- Meng-Qiu Dong
- National Institute of Biological Sciences, Beijing, China
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- Xiangbing Qi
- National Institute of Biological Sciences, Beijing, China
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- Ting Han
- National Institute of Biological Sciences, Beijing, China
抄録
<jats:p>Molecular-glue degraders mediate interactions between target proteins and components of the ubiquitin-proteasome system to cause selective protein degradation. Here, we report a new molecular glue HQ461 discovered by high-throughput screening. Using loss-of-function and gain-of-function genetic screening in human cancer cells followed by biochemical reconstitution, we show that HQ461 acts by promoting an interaction between CDK12 and DDB1-CUL4-RBX1 E3 ubiquitin ligase, leading to polyubiquitination and degradation of CDK12-interacting protein Cyclin K (CCNK). Degradation of CCNK mediated by HQ461 compromised CDK12 function, leading to reduced phosphorylation of a CDK12 substrate, downregulation of DNA damage response genes, and cell death. Structure-activity relationship analysis of HQ461 revealed the importance of a 5-methylthiazol-2-amine pharmacophore and resulted in an HQ461 derivate with improved potency. Our studies reveal a new molecular glue that recruits its target protein directly to DDB1 to bypass the requirement of a substrate-specific receptor, presenting a new strategy for targeted protein degradation.</jats:p>
収録刊行物
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- eLife
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eLife 9 e59994-, 2020-08-17
eLife Sciences Publications, Ltd