AXIN1 polymerization and APC regulate kinase activity in the DC
Kinetic kinase assays to assess β-catenin phosphorylation.
(A) β-Catenin-directed activity of an AXIN1-kinase complex containing either wild-type or polymerization-deficient (M3) AXIN1 ± APC, at different ATP concentrations. See Figure S7 for control reactions and representative autoradiographs. Data points are means from three independent experiments ± SEM.
(B) β-Catenin-directed kinase activity as in (A), but at different β-catenin concentrations.
(C) Summary of kinase activity parameters. Data are means from three independent experiments ± SEM. n.d., not determined because of lack of reaction velocity saturation.