6s56
From Proteopedia
Crystal structure of human ATAD2 bromodomain in complex with N-(4-chloro-3-(N,N-dimethylsulfamoyl)phenyl)-2-(2,5-dioxo-3',4'-dihydro-2'H-spiro[imidazolidine-4,1'-naphthalen]-1-yl)acetamide
Structural highlights
Function[ATAD2_HUMAN] May be a transcriptional coactivator of the nuclear receptor ESR1 required to induce the expression of a subset of estradiol target genes, such as CCND1, MYC and E2F1. May play a role in the recruitment or occupancy of CREBBP at some ESR1 target gene promoters. May be required for histone hyperacetylation. Involved in the estrogen-induced cell proliferation and cell cycle progression of breast cancer cells.[1] Publication Abstract from PubMedThe bromodomain of ATAD2 has proved to be one of the least-tractable proteins within this target class. Here, we describe the discovery of a new class of inhibitors by high-throughput screening and show how the difficulties encountered in establishing a screening triage capable of finding progressible hits were overcome by data-driven optimization. Despite the prevalence of nonspecific hits and an exceptionally low progressible hit rate (0.001%), our optimized hit qualification strategy employing orthogonal biophysical methods enabled us to identify a single active series. The compounds have a novel ATAD2 binding mode with noncanonical features including the displacement of all conserved water molecules within the active site and a halogen-bonding interaction. In addition to reporting this new series and preliminary structure-activity relationship, we demonstrate the value of diversity screening to complement the knowledge-based approach used in our previous ATAD2 work. We also exemplify tactics that can increase the chance of success when seeking new chemical starting points for novel and less-tractable targets. A Qualified Success: Discovery of a New Series of ATAD2 Bromodomain Inhibitors with a Novel Binding Mode Using High-Throughput Screening and Hit Qualification.,Bamborough P, Chung CW, Demont EH, Bridges AM, Craggs PD, Dixon DP, Francis P, Furze RC, Grandi P, Jones EJ, Karamshi B, Locke K, Lucas SCC, Michon AM, Mitchell DJ, Pogany P, Prinjha RK, Rau C, Roa AM, Roberts AD, Sheppard RJ, Watson RJ J Med Chem. 2019 Aug 9. doi: 10.1021/acs.jmedchem.9b00673. PMID:31398032[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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