Structure-based discovery of selective BRPF1 bromodomain inhibitors.

Abstract:

:Bromodomain and plant homeodomain (PHD) finger containing protein 1 (BRPF1) is a member of subfamily IV of the human bromodomains. Experimental evidence suggests that BRPF1 is involved in leukemia. In a previous high-throughput docking campaign we identified several chemotypes targeting the BRPF1 bromodomain. Here, pharmacophore searches using the binding modes of two of these chemotypes resulted in two new series of ligands of the BRPF1 bromodomain. The 2,3-dioxo-quinoxaline 21 exhibits a 2-μM affinity for the BRPF1 bromodomain in two different competition binding assays, and more than 100-fold selectivity for BRPF1 against other members of subfamily IV and representatives of other subfamilies. Cellular activity is confirmed by a viability assay in a leukemia cell line. Isothermal titration calorimetry measurements reveal enthalpy-driven binding for compounds 21, 26 (KD = 3 μM), and the 2,4-dimethyl-oxazole derivative 42 (KD = 10 μM). Multiple molecular dynamics simulations and a dozen co-crystal structures at high resolution provide useful information for further optimization of affinity for the BRPF1 bromodomain.

journal_name

Eur J Med Chem

authors

Zhu J,Zhou C,Caflisch A

doi

10.1016/j.ejmech.2018.05.037

subject

Has Abstract

pub_date

2018-07-15 00:00:00

pages

337-352

eissn

0223-5234

issn

1768-3254

pii

S0223-5234(18)30450-1

journal_volume

155

pub_type

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