(A) Dose-response fluorescence polarization assay of 5-(methylamino)nicotinic acid (MNA) (LI101) shows an IC50 of 76 μM (n = 3 replicates). Error bars denote mean ± SEM.
(B) Oligouridylation assay with positive control (RNA), negative control (DMSO), and 5-(methyl-amino)nicotinic acid. *Oliouridylated pre-let-7g.
(C) HeLa clones expressing the dual luciferase let-7 sensor were incubated with either vehicle (DMSO) or 5-(methylamino)nicotinic acid at various concentrations (50 μM, 100 μM, 150 μM, 250 μM, and 500 μM) for 48 hr, at which time luciferase activity was measured (n = 5 replicates; *p < 0.0001). Error bars denote mean ± SEM.