Structure-Guided Design of IACS-9571, a Selective High-Affinity Dual TRIM24-BRPF1 Bromodomain Inhibitor

Wylie S. Palmer, Guillaume Poncet-Montange, Gang Liu, Alessia Petrocchi, Naphtali Reyna, Govindan Subramanian, Jay Theroff, Anne Yau, Maria Kost-Alimova, Jennifer P. Bardenhagen, Elisabetta Leo, Hannah E. Shepard, Trang N. Tieu, Xi Shi, Yanai Zhan, Shuping Zhao, Michelle C. Barton, Giulio Draetta, Carlo Toniatti, Philip JonesMary Geck Do, Jannik N. Andersen

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

The bromodomain containing proteins TRIM24 (tripartite motif containing protein 24) and BRPF1 (bromodomain and PHD finger containing protein 1) are involved in the epigenetic regulation of gene expression and have been implicated in human cancer. Overexpression of TRIM24 correlates with poor patient prognosis, and BRPF1 is a scaffolding protein required for the assembly of histone acetyltransferase complexes, where the gene of MOZ (monocytic leukemia zinc finger protein) was first identified as a recurrent fusion partner in leukemia patients (8p11 chromosomal rearrangements). Here, we present the structure guided development of a series of N,N-dimethylbenzimidazolone bromodomain inhibitors through the iterative use of X-ray cocrystal structures. A unique binding mode enabled the design of a potent and selective inhibitor 8i (IACS-9571) with low nanomolar affinities for TRIM24 and BRPF1 (ITC Kd = 31 nM and ITC Kd = 14 nM, respectively). With its excellent cellular potency (EC50 = 50 nM) and favorable pharmacokinetic properties (F = 29%), 8i is a high-quality chemical probe for the evaluation of TRIM24 and/or BRPF1 bromodomain function in vitro and in vivo.

Original languageEnglish (US)
Pages (from-to)1440-1454
Number of pages15
JournalJournal of Medicinal Chemistry
Volume59
Issue number4
DOIs
StatePublished - Feb 25 2016
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Drug Discovery

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