期刊
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
卷 178, 期 -, 页码 458-467出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejmech.2019.06.011
关键词
Fragment-based lead discovery; Fragment screening; Fluorescence polarization; Liver X receptor; X-ray crystallography
资金
- National Natural Science Foundation of China [81773636]
- Guangdong Natural Science Foundation [2017A030313123]
- Program for Guangdong Introducing Innovative and Entrepreneurial Teams [2016ZT06Y337]
- National Key Research and Development Program [2017YFE0109900]
The liver X receptors (LXRs) of the nuclear receptor family are promising therapeutic targets of multiple diseases like lipid disorders, chronic inflammation, as well as different human cancers. To date, no LXR agonists or antagonists can be used in clinics, emphasizing the importance for discovering new LXR modulators. Fragment-based lead discovery (FBLD) is powerful for designing new scaffolds and new mechanistic drugs, but fragment screening has not been applied to LXRs yet, which might be due to the lack of a specific fragment screening method against the dynamic and hydrophobic ligand binding domain (LBD) of LXRs. Herein, a series of fluorescent tracers were designed, synthesized and tested. The tracer based on hyodeoxycholic acid exhibited a good capability for competitively detecting the ligand binding of LXR beta using a fluorescence polarization approach. Then, 1074 fragments were screened against the LBD of LXR beta (LXR beta-LBD), resulting in 27 binding hits. These fragment hits were further tested using the co-activator recruitment assay and reporter gene assay, and efforts in X-ray crystallography fortunately solved a co-crystal structure of LXR beta-LBD with the fragment F3 (tert-buty1-7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate). The fluorescence-based fragment screening tool and the newly identified LXR beta binding fragments provide the basis for developing novel LXR beta modulators. (C) 2019 Elsevier Masson SAS. All rights reserved.
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