National Center for
4RER: Crystal Structure Of The Phosphorylated Human Alpha1 Beta2 Gamma1 Holo-ampk Complex Bound To Amp And Cyclodextrin
Cell Res. (2015) 25 p.50-66
AMP-activated protein kinase (AMPK) is a central cellular energy sensor and regulator of energy homeostasis, and a promising drug target for the treatment of diabetes, obesity, and cancer. Here we present low-resolution crystal structures of the human alpha1beta2gamma1 holo-AMPK complex bound to its allosteric modulators AMP and the glycogen-mimic cyclodextrin, both in the phosphorylated (4.05 A) and non-phosphorylated (4.60 A) state. In addition, we have solved a 2.95 A structure of the human kinase domain (KD) bound to the adjacent autoinhibitory domain (AID) and have performed extensive biochemical and mutational studies. Together, these studies illustrate an underlying mechanism of allosteric AMPK modulation by AMP and glycogen, whose binding changes the equilibria between alternate AID (AMP) and carbohydrate-binding module (glycogen) interactions.