Discovery and characterization of bromodomain 2–specific inhibitors of BRDT

Yu, Zhifeng; Ku, Angela F.; Anglin, Justin L.; Sharma, Rajesh; Ucisik, Melek Nihan; Faver, John C.; Li, Feng; Nyshadham, Pranavanand; Simmons, Nicholas; Sharma, Kiran L.; Nagarajan, Sureshbabu; Riehle, Kevin; Kaur, Gundeep; Sankaran, Banumathi; Storl-Desmond, Marta; Palmer, Stephen S.; Young, Damian W.; Kim, Choel; Matzuk, Martin M.

doi:10.1073/pnas.2021102118

Discovery and characterization of bromodomain 2–specific inhibitors of BRDT

Journal Article · Thu Feb 25 23:00:00 EST 2021 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.2021102118· OSTI ID:1817641

^[1]; Ku, Angela F. ^[1]; Anglin, Justin L. ^[1]; Sharma, Rajesh ^[2]; Ucisik, Melek Nihan ^[1]; Faver, John C. ^[1]; ^[3]; Nyshadham, Pranavanand ^[1]; Simmons, Nicholas ^[1]; ^[1]; Nagarajan, Sureshbabu ^[1]; Riehle, Kevin ^[1]; Kaur, Gundeep ^[2]; Sankaran, Banumathi ^[4]; Storl-Desmond, Marta ^[1]; Palmer, Stephen S. ^[1]; Young, Damian W. ^[3]; Kim, Choel ^[3]; ^[3]

Baylor College of Medicine, Houston, TX (United States). Center for Drug Discovery
Baylor College of Medicine, Houston, TX (United States)
Baylor College of Medicine, Houston, TX (United States). Center for Drug Discovery; Baylor College of Medicine, Houston, TX (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Berkeley Center for Structural Biology

Bromodomain testis (BRDT), a member of the bromodomain and extraterminal (BET) subfamily that includes the cancer targets BRD2, BRD3, and BRD4, is a validated contraceptive target. All BET subfamily members have two tandem bromodomains (BD1 and BD2). Knockout mice lacking BRDT-BD1 or both bromodomains are infertile. Treatment of mice with JQ1, a BET BD1/BD2 nonselective inhibitor with the highest affinity for BRD4, disrupts spermatogenesis and reduces sperm number and motility. To assess the contribution of each BRDT bromodomain, we screened our collection of DNA-encoded chemical libraries for BRDT-BD1 and BRDT-BD2 binders. High-enrichment hits were identified and resynthesized off-DNA and examined for their ability to compete with JQ1 in BRDT and BRD4 bromodomain AlphaScreen assays. These studies identified CDD-1102 as a selective BRDT-BD2 inhibitor with low nanomolar potency and >1,000-fold selectivity over BRDT-BD1. Structure–activity relationship studies of CDD-1102 produced a series of additional BRDT-BD2/BRD4-BD2 selective inhibitors, including CDD-1302, a truncated analog of CDD-1102 with similar activity, and CDD-1349, an analog with sixfold selectivity for BRDT-BD2 versus BRD4-BD2. BROMOscan bromodomain profiling confirmed the great affinity and selectivity of CDD-1102 and CDD-1302 on all BET BD2 versus BD1 with the highest affinity for BRDT-BD2. Cocrystals of BRDT-BD2 with CDD-1102 and CDD-1302 were determined at 2.27 and 1.90 Å resolution, respectively, and revealed BRDT-BD2 specific contacts that explain the high affinity and selectivity of these compounds. These BD2-specific compounds and their binding to BRDT-BD2 are unique compared with recent reports and enable further evaluation of their nonhormonal contraceptive potential in vitro and in vivo.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Institutes of Health (NIH); Bill and Melinda Gates Foundation; Welch Foundation; Cancer Prevention Research Institute of Texas

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1817641

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 9 Vol. 118; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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