1227634-69-6

A cell-permeable purine compound that acts as a high-affinity aryl hydrocarbon receptor (AhR) antagonist (IC₅₀ = 62 nM in mouse liver cytosol expressing humanized AhR) and lacks any agonist activity even at higher doses. Reportedly binds with high affinity to the ligand-binding pocket of AhR and blocks the binding of an array of exogenous and endogenous ligands. Shown to non-covalently interact with Ser³¹⁷, His²⁹¹, and Ser³⁶⁵ in human and with Ser³¹¹, His²⁸⁵, and Ser³⁵⁹ in mouse AhR. Represses AhR transcriptional activity via the dioxin response element (DRE)-dependent and independent mediated responses in human and mouse cells (IC₅₀ = 8.5 nM in HepG2 40/6 cells).

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