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  • 575545 - Tankyrase1/2 Inhibitor, XAV939 - Calbiochem

575545 Sigma-Aldrich

Tankyrase1/2 Inhibitor, XAV939 - Calbiochem

The Tankyrase1/2 Inhibitor, XAV939 controls the biological activity of Tankyrase1/2. This small molecule/inhibitor is primarily used for Phosphorylation & Dephosphorylation applications.

Synonym: 2-(4-(Trifluoromethyl)phenyl)-7,8-dihydro-5H-thiopyrano[4,3-d]pyrimidin-4-ol, Wnt Pathway Inhibitor V, TNKS1/2 Inhibitor I, Tankyrase1/2 Inhibitor, XAV939 - Calbiochem

  • Empirical Formula (Hill Notation) C14H11F3N2OS

  • Molecular Weight 312.31



Quality Level   100
assay   ≥97% (HPLC)
form   solid
mfr. no.   Calbiochem®
storage condition   OK to freeze
  protect from light
storage conditions   -20C
color   off-white
solubility   DMSO: 25 mg/mL
shipped in   ambient


General description

A cell-permeable dihydrothiopyranopyrimidinol that binds TNKS1/PARP5a and TNKS2/PARP5b with high affinity (Kd = 99 and 93 nM, respectively) and potently inhibits their PARsylation (poly ADP-ribosylation) activity (IC50 = 11 and 4 nM, respectively), while exhibiting much lower activity against PARP1 and PARP2 (IC50 = 2.194 and 0.114 µM, respectively). TNKS, but not PARP1/2, function knockdown by siRNA or XAV939 treatment suppresses cellular axin1/2 PARsylation and ubiquitination/proteasomal degradation, resulting in axin build-up, β-catenin destruction, and blockage of Wnt signaling. XAV939 is shown to inhibit the growth of β-catenin-dependent DLD-1, but not that of β-catenin-independent RKO, cells (by >95% vs. no effect at 3.3 µM, respectively) in vitro and prevent the regeneration of zebrafish tail fin (by ~70% at 7 d post-amputation, 5 µM) after surgical removal in vivo.


10 mg in Glass bottle

Packaged under inert gas


Toxicity: Standard Handling (A)


Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months at -20°C.

Other Notes

Huang, S.M., et al. 2009. Nature461, 614.

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