5'-adenosine monophosphate-activated protein kinase (AMPK) (AMPK)

5'-adenosine monophosphate-activated protein kinase (AMPK) is a highly conserved heterotrimeric enzyme complex that serves as the central sensor of cellular energy status across all eukaryotic species (Hardie, 2014 [4]). It is activated in response to energy stress, signaled by rising ratios of AMP:ATP or ADP:ATP, which occur during nutrient deprivation, hypoxia, or physical exertion (Winder & Thomson, 2007 [2]). Upon activation, AMPK restores metabolic homeostasis by stimulating catabolic pathways that produce ATP, such as glucose uptake and fatty acid oxidation, while simultaneously inhibiting anabolic pathways that consume ATP, including the synthesis of fatty acids, cholesterol, and proteins (Inoki et al., 2012 [6]). This 'master switch' function makes AMPK a primary therapeutic target for metabolic disorders like type 2 diabetes and obesity, where its activation improves glucose sensitivity and lipid profiles (Inoki et al., 2012 [6]). Furthermore, AMPK is an area of intense research in oncology and neurodegeneration due to its ability to modulate cell growth, autophagy, and mitochondrial health (Hardie, 2014 [4]; [13]).

Other names

Energy sensorMetabolic master switchAMP-activated protein kinaseAdenosine 5'-monophosphate-activated protein kinase

AMPK is activated by an increase in the cellular AMP:ATP ratio, leading to the phosphorylation of downstream targets such as ACC (Acetyl-CoA carboxylase) and TBC1D1, which promotes ATP-generating catabolic processes and inhibits ATP-consuming anabolic processes.