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From Proteopedia
Crystal structure of human BCL6 BTB domain in complex with compound 22
Structural highlights
DiseaseBCL6_HUMAN Note=Chromosomal aberrations involving BCL6 may be a cause of B-cell non-Hodgkin lymphoma. Translocation t(3;14)(q27;q32); translocation t(3;22)(q27;q11) with immunoglobulin gene regions. Note=A chromosomal aberration involving BCL6 may be a cause of a form of B-cell leukemia. Translocation t(3;11)(q27;q23) with POU2AF1/OBF1. Note=A chromosomal aberration involving BCL6 may be a cause of lymphoma. Translocation t(3;4)(q27;p11) with ARHH/TTF. FunctionBCL6_HUMAN Transcriptional repressor which is required for germinal center formation and antibody affinity maturation. Probably plays an important role in lymphomagenesis.[1] [2] Publication Abstract from PubMedBy suppressing gene transcription through the recruitment of corepressor proteins, B-cell lymphoma 6 (BCL6) protein controls a transcriptional network required for the formation and maintenance of B-cell germinal centres. As BCL6 deregulation is implicated in the development of Diffuse Large B-Cell Lymphoma, we sought to discover novel small molecule inhibitors that disrupt the BCL6-corepressor protein-protein interaction (PPI). Here we report our hit finding and compound optimisation strategies, which provide insight into the multi-faceted orthogonal approaches that are needed to tackle this challenging PPI with small molecule inhibitors. Using a 1536-well plate fluorescence polarisation high throughput screen we identified multiple hit series, which were followed up by hit confirmation using a thermal shift assay, surface plasmon resonance and ligand-observed NMR. We determined X-ray structures of BCL6 bound to compounds from nine different series, enabling a structure-based drug design approach to improve their weak biochemical potency. We developed a time-resolved fluorescence energy transfer biochemical assay and a nano bioluminescence resonance energy transfer cellular assay to monitor cellular activity during compound optimisation. This workflow led to the discovery of novel inhibitors with respective biochemical and cellular potencies (IC50s) in the sub-micromolar and low micromolar range. Discovering cell-active BCL6 inhibitors: effectively combining biochemical HTS with multiple biophysical techniques, X-ray crystallography and cell-based assays.,Pierrat OA, Liu M, Collie GW, Shetty K, Rodrigues MJ, Le Bihan YV, Gunnell EA, McAndrew PC, Stubbs M, Rowlands MG, Yahya N, Shehu E, Talbot R, Pickard L, Bellenie BR, Cheung KJ, Drouin L, Innocenti P, Woodward H, Davis OA, Lloyd MG, Varela A, Huckvale R, Broccatelli F, Carter M, Galiwango D, Hayes A, Raynaud FI, Bryant C, Whittaker S, Rossanese OW, Hoelder S, Burke R, van Montfort RLM Sci Rep. 2022 Nov 3;12(1):18633. doi: 10.1038/s41598-022-23264-z. PMID:36329085[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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