Ezh2/Ezh1 Inhibitor, UNC1999

A cell-permeable GSK126 structural analog that acts as a potent, SAM-, but not substrate-, competitive inhibitor against Ezh1 and Ezh2 (IC₅₀ = 5, 20, 20, 45 nM against PRC2 complex containing Ezh2 wt, Ezh2 Y641F, Ezh2 Y641N, or wt Ezh1 in H3 peptide methylation assays; [SAM] = 5 µM), while exhibiting much reduced or little potency toward panels of 15 other methyltransferases (IC₅₀ >10 µM), 50 kinases (≤20% inhibition at 10µM), as well as 43 GPCRs, transporters, and ion channels, although high affinity binding is observed with Sigma-2 receptor S2R/PGRMC1 (K_i = 65 nM) with unknown impact toward its function. Cellular H3K27me3 level is shown to be largely reduced in MCF10A, MCF7, and DB cells with no significant effect on proliferation upon a 3-day UNC1999 treatment (IC_max = 3 to 5 µM), while complete cell death is reported in the EZH2 Y641N-harboring DLBCL line DB cell culture upon an 8-day 5 µM drug exposure. Exhibits good bioavailability in mice with the plasma drug concentration maintained above 100 nM for 20 h and 24 h, respectively, following a single 50 mg/kg oral or i.p. dosage (C_max = 4.7 and >9.7 µM, respectively). Both its oral bioavailability and enhanced Ezh1 potency can greatly complement the Ezh2-selective GSK126 in in vitro and in vivo studies.

Cell permeable: yes

Primary Target
Ezh2

Reversible: yes

Secondary Target
Ezh1

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.

Konze, K.D., et al. 2013. ACS Chem. Biol.8, 1324.

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