Discovery of a B-Cell Lymphoma 6 Protein–Protein Interaction Inhibitor by a Biophysics-Driven Fragment-Based Approach
- 11 May 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Medicinal Chemistry
- Vol. 60 (10), 4358-4368
- https://doi.org/10.1021/acs.jmedchem.7b00313
Abstract
B-cell lymphoma 6 (BCL6) is a transcriptional factor that expresses in lymphocytes and regulates the differentiation and proliferation of lymphocytes. Therefore, BCL6 is a therapeutic target for autoimmune diseases and cancer treatment. This report presents the discovery of BCL6–corepressor interaction inhibitors by using a biophysics-driven fragment-based approach. Using the surface plasmon resonance (SPR)-based fragment screening, we successfully identified fragment 1 (SPR KD = 1200 μM, ligand efficiency (LE) = 0.28), a competitive binder to the natural ligand BCoR peptide. Moreover, we elaborated 1 into the more potent compound 7 (SPR KD = 0.078 μM, LE = 0.37, cell-free protein–protein interaction (PPI) IC50 = 0.48 μM (ELISA), cellular PPI IC50 = 8.6 μM (M2H)) by a structure-based design and structural integration with a second high-throughput screening hit.Keywords
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