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J Med Chem. 2020 Jan 9;63(1):231-240. doi: 10.1021/acs.jmedchem.9b01157. Epub 2019 Dec 18.

A Novel Decalin-Based Bicyclic Scaffold for FKBP51-Selective Ligands.

Author information

1
Department of Translational Research in Psychiatry , Max Planck Institute of Psychiatry , Kraepelinstrasse 2 , 80804 Munich , Germany.
2
Institute for Organic Chemistry and Biochemistry , Technische Universit├Ąt Darmstadt , Alarich-Weiss-Strasse 4 , D-64287 Darmstadt , Germany.
3
Max Planck Institute of Biochemistry , Am Klopferspitz 18 , 82152 Martinsried , Germany.
4
Department of Advanced Biomedical Sciences , Federico II University of Naples , 80131 Naples , Italy.
5
Department of Molecular Medicine and Medical Biotechnologies , Federico II University , 80131 Naples , Italy.

Abstract

Selective inhibition of FKBP51 has emerged as possible novel treatment for diseases like major depressive disorder, obesity, chronic pain, and certain cancers. The current FKBP51 inhibitors are rather large, flexible, and have to be further optimized. By using a structure-based rigidification strategy, we hereby report the design and synthesis of a novel promising bicyclic scaffold for FKBP51 ligands. The structure-activity analysis revealed the decalin scaffold as the best moiety for the selectivity-enabling subpocket of FBKP51. The resulting compounds retain high potency for FKBP51 and excellent selectivity over the close homologue FKBP52. With the cocrystal structure of an advanced ligand in this novel series, we show how the decalin locks the key selectivity-inducing cyclohexyl moiety of the ligand in a conformation typical for FKBP51-selective binding. The best compound 29 produces cell death in a HeLa-derived KB cell line, a cellular model of cervical adenocarcinoma, where FKBP51 is highly overexpressed. Our results show how FKBP51 inhibitors can be rigidified and extended while preserving FKBP51 selectivity. Such inhibitors might be novel tools in the treatment of human cancers with deregulated FKBP51.

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