To prepare the AMPK kinase complex, FLAG-AMPK was transfected into HEK293 cells which were treated with AICAR (10 mM) for 12 h to stimulate AMPK activation and then immunoprecipitated (IPed) using anti-FLAG agarose beads according to the manufacturer’s instructions. The in vitro kinase assays were conducted in a kinase reaction buffer (50 mM Tris-HCl pH 7.4, 1 mM dithiothreitol (DTT), 10 mM MgCl2, 0.5 M ATP) containing the IPed AMPK complex and active GSK-3β (100 ng) plus 2 µg soluble various forms of GST-SIRT7 proteins. Reactions were incubated at 30 °C for 1 h and then terminated by the addition of sodium dodecyl sulfate (SDS) sample buffer. The phosphorylated SIRT7 was assessed by western blotting.
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