AMP-activated protein kinase beta-2-containing complex (AMPK-beta2) (AMPK-beta2)

AMP-activated protein kinase (AMPK) is a heterotrimeric enzyme complex consisting of an alpha catalytic subunit and regulatory beta and gamma subunits, serving as a central sensor of cellular energy status (Hardie et al., 2012, Chem Biol). The beta-2 (β2) subunit, encoded by the PRKAB2 gene, is the predominant beta isoform expressed in skeletal muscle, making β2-containing complexes critical mediators of exercise-induced glucose uptake and fatty acid oxidation (UniProt P54619; Myers et al., 2017, Science). Activation of AMPK-β2 complexes promotes the translocation of GLUT4 to the plasma membrane and inhibits acetyl-CoA carboxylase (ACC), thereby enhancing insulin sensitivity and metabolic efficiency (Hardie, 2014, FEBS Lett). In the context of metabolic diseases like type 2 diabetes and obesity, pharmacological activation of these complexes is pursued to improve systemic glucose homeostasis (Cameron et al., 2016, J Med Chem). However, drug development must balance the benefits of muscle-specific activation against potential risks such as cardiac hypertrophy, which has been associated with chronic overactivation of certain AMPK isoforms in preclinical models (Myers et al., 2017, Science).

Other names

PRKAB2-containing AMPKAMP-activated protein kinase subunit beta-2 complexAMPK beta-25'-AMP-activated protein kinase subunit beta-2

Direct allosteric activation via the Allosteric Drug and Metabolite (ADaM) site located between the alpha-kinase domain and the beta-subunit carbohydrate-binding module, which stabilizes the active conformation and protects the alpha-subunit Thr172 from dephosphorylation (Cokorinos et al., 2017, Cell Metab).