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Crystal structure of TNKS2 in complex with 2-(4-chlorophenyl)-1,2,3,4- tetrahydroquinazolin-4-one
Structural highlights
FunctionTNKS2_HUMAN Poly-ADP-ribosyltransferase involved in various processes such as Wnt signaling pathway, telomere length and vesicle trafficking. Acts as an activator of the Wnt signaling pathway by mediating poly-ADP-ribosylation of AXIN1 and AXIN2, 2 key components of the beta-catenin destruction complex: poly-ADP-ribosylated target proteins are recognized by RNF146, which mediates their ubiquitination and subsequent degradation. Also mediates poly-ADP-ribosylation of BLZF1 and CASC3, followed by recruitment of RNF146 and subsequent ubiquitination. Mediates poly-ADP-ribosylation of TERF1, thereby contributing to the regulation of telomere length. May also regulate vesicle trafficking and modulate the subcellular distribution of SLC2A4/GLUT4-vesicles.[1] [2] [3] [4] Publication Abstract from PubMedDiphtheria toxin-like ADP-ribosyltransferases catalyse a posttranslational modification, ADP-ribosylation and form a protein family of 17 members in humans. Two of the family members, tankyrases 1 and 2, are involved in several cellular processes including mitosis and Wnt/beta-catenin signalling pathway. They are often over-expressed in cancer cells and have been linked with the survival of cancer cells making them potential therapeutic targets. In this study, we identified nine tankyrase inhibitors through virtual and in vitro screening. Crystal structures of tankyrase 2 with the compounds showed that they bind to the nicotinamide binding site of the catalytic domain. Based on the co-crystal structures we designed and synthesized a series of tetrahydroquinazolin-4-one and pyridopyrimidin-4-one analogs and were subsequently able to improve the potency of a hit compound almost 100-fold (from 11muM to 150nM). The most potent compounds were selective towards tankyrases over a panel of other human ARTD enzymes. They also inhibited Wnt/beta-catenin pathway in a cell-based reporter assay demonstrating the potential usefulness of the identified new scaffolds for further development. Discovery of potent and selective nonplanar tankyrase inhibiting nicotinamide mimics.,Nkizinkiko Y, Suneel Kumar BV, Jeankumar VU, Haikarainen T, Koivunen J, Madhuri C, Yogeeswari P, Venkannagari H, Obaji E, Pihlajaniemi T, Sriram D, Lehtio L Bioorg Med Chem. 2015 Aug 1;23(15):4139-49. doi: 10.1016/j.bmc.2015.06.063. Epub , 2015 Jul 2. PMID:26183543[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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