期刊
ISCIENCE
卷 25, 期 1, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.isci.2021.103719
关键词
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资金
- National Key R&D Program of China [2018YFA0107303, 2020YFA0908100]
- National Natural Science Foundation of China [92053114, 32070632, 81672955]
- Xiamen Southern Oceanographic Center [17GYY002NF02]
- National Institutes of Health [R01AI41757]
The BET-bromodomain protein BRD4 utilizes two bromodomains to target acetyl-histones and other domains, stimulating transcription of proto-oncogenes and key cell identity genes. Recent studies highlight the importance of BRD4's ability to form phase-separated condensates that cluster at the super-enhancer regions of target genes. Through the discovery of a natural product called PCG, derived from the Chinese medicinal herb polygonum cuspidatum Sieb. et Zucc., a BET inhibitor that selectively targets BRD4 and suppresses phase separation, a unique mechanism of action among known BET inhibitors, has been identified.
The BET-bromodomain protein BRD4 uses two bromodomains to target acetyl-histones and other domains to recruit P-TEFb and other transcription factors to stimulate transcription of proto-oncogenes and key cell identity genes. Recent studies show that its ability to form phase-separated condensates that cluster preferentially at the super-enhancer regions of target genes is key for BRD4 to exert its functions. Here, we describe the identification of a natural product called PCG from polygonum cuspidatum Sieb.et Zucc., a traditional Chinese medicinal herb, that directly binds to BRD4. This binding inhibits BRD4 phase separation, turns dynamic BRD4 nuclear condensates into static aggregates, and effectively shuts down transcription of BRD4-dependent genes. Thus, through PCG we have discovered a BET inhibitor that not only selectively targets BRD4 but also works by suppressing phase separation, a mechanism of action that is different from those of the other known BET inhibitors.
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