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• W2804346153 abstract "Abstract The dynamic and reversible acetylation of proteins catalyzed by histone acetyltransferases (HATs) and histone deacetylases (HDACs) is a major epigenetic regulatory mechanism of gene transcription associated with multiple diseases. While HDAC inhibitors are approved to treat certain cancers, progress on the development of drug-like HAT inhibitors has lagged. The HAT paralogs p300 and CBP (p300/CBP) are key transcriptional co-activators essential for a multitude of cellular processes and also implicated in human pathological conditions, including cancer. Current p300/CBP HAT domain inhibitors including natural products, bi-substrate analogs (Lys-CoA) and the widely utilized C646 lack potency or selectivity. Here, we describe A-485, a potent, selective and drug-like p300/CBP catalytic inhibitor. We show the first high resolution (1.95Å) co-crystal structure of a small molecule bound to the catalytic active site of p300 and demonstrate that A-485 is acetyl-CoA competitive. A-485 selectively inhibited proliferation across lineage-specific tumor types, including several hematological malignancies and androgen receptor-positive prostate cancer. A-485 inhibited the androgen receptor transcriptional program in both androgen sensitive and castrate resistant prostate cancer and inhibited tumor growth in a castration resistant xenograft model. These results demonstrate the feasibility of selectively targeting the catalytic activity of histone acetyltransferases. Citation Format: Kenneth D. Bromberg, Loren M. Lasko, Clarissa G. Jakob, Wei Qiu, Debra Montgomery, Enrico L. Digiammarino, Todd M. Hansen, Roberto M. Risi, Robin R. Frey, Vlasios Manaves, Bailin Shaw, Mikkel Algire, Paul Hessler, Lloyd T. Lam, Tamar Uziel, Emily Favire, Debra Ferguson, Fritz G. Buchanan, Ruth L. Martin, Maricel Torrent, Saul H. Rosenberg, Michael R. Michaelides, Albert Lai. Discovery of a potent catalytic p300/CBP inhibitor that targets lineage-specific tumors [abstract]. In: Proceedings of the AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics; 2017 Oct 26-30; Philadelphia, PA. Philadelphia (PA): AACR; Mol Cancer Ther 2018;17(1 Suppl):Abstract nr LB-A23." @default.
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• W2804346153 date "2018-01-01" @default.
• W2804346153 modified "2023-09-27" @default.
• W2804346153 title "Abstract LB-A23: Discovery of a potent catalytic p300/CBP inhibitor that targets lineage-specific tumors" @default.
• W2804346153 doi "https://doi.org/10.1158/1535-7163.targ-17-lb-a23" @default.
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