Fig. 6. RIF1 promotes PP1 to dephosphorylate AXIN.
a, b Immunoprecipitation was performed with PP1 antibody and the precipitated protein complexes were analyzed by western blots with antibodies to RIF1 and AXIN in H1299 (a) and SK-MES-1 (b) cells. c, d RIF1-silenced H1299 (c) and SK-MES-1 (d) cells and the scrambled control cells were transfected with Flag-tagged AXIN plasmid. Immunoprecipitation was done with anti-FLAG M2 magnetic beads and the precipitated complexes, which were pull down by Flag-tagged AXIN were subjected to western blot with antibodies to RIF1, PP1 and p-Ser. e, f H1299 (e) and SK-MES-1 (f) cells were co-transfected Flag-tagged AXIN plasmid with control vector or RIF1 overexpression plasmid. Immunoprecipitation was performed with anti-FLAG M2 magnetic beads and the precipitated complexes were analyzed by western blots with antibodies to RIF1, PP1 and p-Ser (mouse IgG conjugated with magnetic beads being the negative control)