title: [1,2,4]triazol-3-ylsulfanylmethyl)-3-phenyl-[1,2,4]oxadiazoles: antagonists of the Wnt pathway that inhibit tankyrases 1 and 2 via novel adenosine pocket binding.
abstract: The Wnt signaling pathway is critical to the regulation of key cellular processes. When deregulated, it has been shown to play a crucial role in the growth and progression of multiple human cancers. The identification of small molecule modulators of Wnt signaling has proven challenging, largely due to the relative paucity of druggable nodes in this pathway. Several recent publications have identified small molecule inhibitors of the Wnt pathway, and tankyrase (TNKS) inhibition has been demonstrated to antagonize Wnt signaling via axin stabilization. Herein, we report the early hit assessment of a series of compounds previously reported to antagonize Wnt signaling. We report the biophysical, computational characterization, structure-activity relationship, and physicochemical properties of a novel series of [1,2,4]triazol-3-ylsulfanylmethyl)-3-phenyl-[1,2,4]oxadiazole inhibitors of TNKS1 and 2. Furthermore, a cocrystal structure of compound 24 complexed to TNKS1 demonstrates an alternate binding mode for PARP family member proteins that does not involve interactions with the nicotinamide binding pocket.
authors.affiliation: Novartis Institutes for Biomedical Research, Inc., Cambridge, Massachusetts 02319, United States. michael.shultz@novartis.com
authors.forename: Michael D
authors.initials: MD
authors.lastname: Shultz
authors.forename: Christina A
authors.initials: CA
authors.lastname: Kirby
authors.forename: Travis
authors.initials: T
authors.lastname: Stams
authors.forename: Donovan N
authors.initials: DN
authors.lastname: Chin
authors.forename: Jutta
authors.initials: J
authors.lastname: Blank
authors.forename: Olga
authors.initials: O
authors.lastname: Charlat
authors.forename: Hong
authors.initials: H
authors.lastname: Cheng
authors.forename: Atwood
authors.initials: A
authors.lastname: Cheung
authors.forename: Feng
authors.initials: F
authors.lastname: Cong
authors.forename: Yun
authors.initials: Y
authors.lastname: Feng
authors.forename: Pascal D
authors.initials: PD
authors.lastname: Fortin
authors.forename: Tami
authors.initials: T
authors.lastname: Hood
authors.forename: Viraj
authors.initials: V
authors.lastname: Tyagi
authors.forename: Ming
authors.initials: M
authors.lastname: Xu
authors.forename: Bailin
authors.initials: B
authors.lastname: Zhang
authors.forename: Wenlin
authors.initials: W
authors.lastname: Shao
mesh_terms: D000241:Adenosine / Q000737:chemistry / Q000378:metabolism*; D001665:Binding Sites; D018360:Crystallography, X-Ray; D057809:HEK293 Cells; D006801:Humans; D008958:Models, Molecular; D010069:Oxadiazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011487:Protein Conformation; D013329:Structure-Activity Relationship; D013440:Sulfides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D038501:Tankyrases / Q000037:antagonists & inhibitors*; D014230:Triazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D060449:Wnt Signaling Pathway / Q000187:drug effects*
chemical_list: D000241:Adenosine; D010069:Oxadiazoles; D013440:Sulfides; D038501:Tankyrases; D014230:Triazoles; C437334:TNKS2 protein, human; C418109:TNKS protein, human