AMP-activated protein kinase catalytic subunit alpha (AMPKα) (AMPKα)

AMP-activated protein kinase alpha (AMPKα) is the catalytic subunit of the heterotrimeric AMPK complex, which functions as the primary energy sensor and master regulator of metabolic homeostasis in eukaryotic cells [1, 4, 5]. It is activated in response to energy stress, signaled by increased cellular AMP:ATP or ADP:ATP ratios, as well as by upstream kinases like LKB1 and CaMKKβ that phosphorylate the conserved Thr-172 residue within its activation loop [1, 10, 13, 16]. Upon activation, AMPKα coordinates a metabolic switch from energy-consuming anabolic processes (such as lipid, cholesterol, and protein synthesis) to energy-producing catabolic pathways (such as glucose uptake and fatty acid oxidation) to restore cellular energy balance [5, 16, 21]. Due to its central role in glucose and lipid metabolism, AMPKα is a major therapeutic target for metabolic diseases, including type 2 diabetes, obesity, and non-alcoholic fatty liver disease [3, 5, 12, 21]. Furthermore, its ability to inhibit the mTOR signaling pathway and regulate the cell cycle makes it a significant target of interest in oncology and cardiovascular health research [3, 11, 16, 17, 21].

Other names

PRKAAPRKAA1PRKAA2AMP-activated protein kinase alpha5'-AMP-activated protein kinase catalytic subunit alphaSNF1-like kinase

Activation of the AMPK complex through allosteric binding of AMP/ADP or small molecule agonists (direct or indirect), leading to the phosphorylation of the alpha-subunit at Thr-172, which triggers downstream phosphorylation of metabolic enzymes to enhance catabolism and inhibit anabolism [1, 6, 13, 16, 21].