7avq
From Proteopedia
Crystal structure of haspin in complex with disubstituted imidazo[1,2- b]pyridazine inhibitor (compound 12)
Structural highlights
FunctionHASP_HUMAN Serine/threonine-protein kinase that phosphorylates histone H3 at 'Ser-3' (H3T3ph) during mitosis. This positions and activates AURKB and other components of the chromosomal passenger complex (CPC) at centromeres to ensure proper chromatid cohesion, metaphase alignment and normal progression through the cell cycle.[1] [2] [3] [4] [5] Publication Abstract from PubMedHaspin is a mitotic protein kinase required for proper cell division by modulating Aurora B kinase localisation and activity as well as histone phosphorylation. Here a series of imidazopyridazines based on the CHR-6494 and Structure Activity Relationship was established. An assessment of the inhibitory activity of the lead structures on human Haspin and several other protein kinases is presented. The lead structure was rapidly optimised using a combination of crystal structures and effective docking models, with the best inhibitors exhibiting potent inhibitory activity on Haspin with IC50 between 6 and 100 nM in vitro. The developed inhibitors displayed anti-proliferative properties against various human cancer cell lines in 2D and spheroid cultures and significantly inhibited the migration ability of osteosarcoma U-2 OS cells. Notably, we show that our lead compounds are powerful Haspin inhibitors in human cells, and did not block G2/M cell cycle transition due to improved selectivity against CDK1/CyclinB. Design of new disubstituted imidazo[1,2-b]pyridazine derivatives as selective Haspin inhibitors. Synthesis, binding mode and anticancer biological evaluation.,Elie J, Feizbakhsh O, Desban N, Josselin B, Baratte B, Bescond A, Duez J, Fant X, Bach S, Marie D, Place M, Ben Salah S, Chartier A, Berteina-Raboin S, Chaikuad A, Knapp S, Carles F, Bonnet P, Buron F, Routier S, Ruchaud S J Enzyme Inhib Med Chem. 2020 Dec;35(1):1840-1853. doi:, 10.1080/14756366.2020.1825408. PMID:33040634[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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