In vitro kinase assay

XT Xiaolong Tang
GL Guo Li
LS Lei Shi
FS Fengting Su
MQ Minxian Qian
ZL Zuojun Liu
YM Yuan Meng
SS Shimin Sun
JL Ji Li
BL Baohua Liu
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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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