AMP-activated protein kinase (AMPK) ADaM site (AMPK ADaM site)

The AMP-activated protein kinase (AMPK) ADaM (Allosteric Drug and Metabolite) site is a regulatory pocket located at the interface between the alpha-subunit kinase domain and the beta-subunit carbohydrate-binding module (CBM) (Xiao et al., Nature, 2013). Unlike the canonical nucleotide-binding sites on the gamma-subunit that respond to AMP/ATP ratios, the ADaM site facilitates potent allosteric activation by synthetic small molecules and certain natural metabolites like salicylate (Hawley et al., Science, 2012). Binding at this site stabilizes the kinase in its active conformation and significantly reduces the rate of dephosphorylation of the critical Thr172 residue in the activation loop (Langendorf et al., J Biol Chem, 2016). Biologically, AMPK acts as a master energy sensor that maintains cellular energy homeostasis by switching off ATP-consuming anabolic pathways and switching on ATP-producing catabolic pathways (Hardie et al., Nat Rev Mol Cell Biol, 2012). Pharmacological targeting of the ADaM site is a major therapeutic strategy for treating metabolic disorders such as type 2 diabetes and nonalcoholic steatohepatitis (NASH), as it can improve insulin sensitivity and reduce hepatic lipid accumulation (Myers et al., Cell Metab, 2017). However, drug development must carefully manage risks such as cardiac hypertrophy, which has been observed with potent pan-AMPK activators in preclinical models (Cokorinos et al., Cell Metab, 2017). This site represents a distinct pharmacological opportunity to modulate energy metabolism independently of cellular adenine nucleotide levels.

Other names

Allosteric Drug and Metabolite siteAlpha-kinase domain/beta-subunit carbohydrate-binding module interfaceAMPK allosteric siteAlpha-KD/beta-CBM interface

Allosteric activation of AMPK through binding at the alpha-KD/beta-CBM interface, which induces a conformational change that enhances catalytic activity and prevents dephosphorylation of the alpha-subunit activation loop at Thr172 (Xiao et al., Nature, 2013; Langendorf et al., J Biol Chem, 2016).