Volume 60, Issue 16 pp. 8760-8765
Communication

Structure-Guided Discovery of a Potent and Selective Cell-Active Inhibitor of SETDB1 Tudor Domain

Yinping Guo

Yinping Guo

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

These authors contributed equally to this work.

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Xin Mao

Xin Mao

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

These authors contributed equally to this work.

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Liang Xiong

Liang Xiong

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

These authors contributed equally to this work.

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Anjie Xia

Anjie Xia

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

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Jing You

Jing You

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

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Guifeng Lin

Guifeng Lin

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

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Chengyong Wu

Chengyong Wu

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

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Luyi Huang

Luyi Huang

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

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Yiwei Wang

Yiwei Wang

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

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Prof. Dr. Shengyong Yang

Corresponding Author

Prof. Dr. Shengyong Yang

State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China

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First published: 28 January 2021
Citations: 35

Graphical Abstract

The first potent and selective small-molecule SETDB1 tandem tudor domain (TTD) inhibitor, (R,R)-59, is reported. (R,R)-59 is an endogenous binder-competitive inhibitor and also showed activities in intact cells. The enantiomer (S,S)-59 did not show any activity.

Abstract

SET domain bifurcated protein 1 (SETDB1) is a histone lysine methyltransferase that promotes the silencing of some tumour suppressor genes and is overexpressed in many cancers. SETDB1 contains a unique tandem tudor domain (TTD) that recognizes histone H3 sequences containing both methylated and acetylated lysines. Beginning with the identification of a hit compound (Cpd1), we discovered the first potent and selective small molecule SETDB1-TTD inhibitor (R,R)-59 through stepwise structure-guided optimization. (R,R)-59 showed a KD value of 0.088±0.045 μM in the ITC assay. The high potency of (R,R)-59 was well explained by the cocrystal structure of the (R,R)-59-TTD complex. (R,R)-59 is an endogenous binder competitive inhibitor. Evidence has also demonstrated its cellular target engagement. Interestingly, the enantiomer (S,S)-59 did not show activity in all the assays, highlighting the potential of (R,R)-59 as a tool compound in exploring the biological functions of SETDB1-TTD.

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