Discovery of potent and selective nonplanar tankyrase inhibiting nicotinamide mimics

Yves Nkizinkiko, B. V.S. Suneel Kumar, Variam Ullas Jeankumar, Teemu Haikarainen, Jarkko Koivunen, Chanduri Madhuri, Perumal Yogeeswari, Harikanth Venkannagari, Ezeogo Obaji, Taina Pihlajaniemi, Dharmarajan Sriram, Lari Lehtiö

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Diphtheria 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/β-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 11 μM to 150 nM). The most potent compounds were selective towards tankyrases over a panel of other human ARTD enzymes. They also inhibited Wnt/β-catenin pathway in a cell-based reporter assay demonstrating the potential usefulness of the identified new scaffolds for further development.

Original languageEnglish (US)
Pages (from-to)4139-4149
Number of pages11
JournalBioorganic and Medicinal Chemistry
Issue number15
StatePublished - Jul 23 2015
Externally publishedYes


  • Cancer
  • Inhibition
  • Poly(ADP-ribose)polymerase
  • Protein crystallography
  • Tankyrase
  • Virtual screening
  • Wnt-signalling

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


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