8c78 | pdb_00008c78

Crystal structure of human BCL6 BTB domain in complex with compound CCT374705

spinqualitylabelsall models 8c78, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8c78 is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, EDO, TWI Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease BCL6_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. Function BCL6_HUMAN Transcriptional repressor which is required for germinal center formation and antibody affinity maturation. Probably plays an important role in lymphomagenesis. Publication Abstract from PubMed B-cell lymphoma 6 (BCL6) is a transcriptional repressor and oncogenic driver of diffuse large B-cell lymphoma (DLBCL). Here, we report the optimization of our previously reported tricyclic quinolinone series for the inhibition of BCL6. We sought to improve the cellular potency and in vivo exposure of the non-degrading isomer, CCT373567, of our recently published degrader, CCT373566. The major limitation of our inhibitors was their high topological polar surface areas (TPSA), leading to increased efflux ratios. Reducing the molecular weight allowed us to remove polarity and decrease TPSA without considerably reducing solubility. Careful optimization of these properties, as guided by pharmacokinetic studies, led to the discovery of CCT374705, a potent inhibitor of BCL6 with a good in vivo profile. Modest in vivo efficacy was achieved in a lymphoma xenograft mouse model after oral dosing. Discovery of an In Vivo Chemical Probe for BCL6 Inhibition by Optimization of Tricyclic Quinolinones.,Harnden AC, Davis OA, Box GM, Hayes A, Johnson LD, Henley AT, de Haven Brandon AK, Valenti M, Cheung KJ, Brennan A, Huckvale R, Pierrat OA, Talbot R, Bright MD, Akpinar HA, Miller DSJ, Tarantino D, Gowan S, de Klerk S, McAndrew PC, Le Bihan YV, Meniconi M, Burke R, Kirkin V, van Montfort RLM, Raynaud FI, Rossanese OW, Bellenie BR, Hoelder S J Med Chem. 2023 Apr 7. doi: 10.1021/acs.jmedchem.3c00155. PMID:37026591 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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