AMP-activated protein kinase subunit beta-1 (PRKAB1) (PRKAB1)

AMP-activated protein kinase subunit beta-1 (PRKAB1) is a regulatory subunit of the heterotrimeric AMPK complex, which serves as a central energy sensor in eukaryotic cells (UniProt P80331). The beta-1 subunit acts as a scaffold, bringing together the catalytic alpha and regulatory gamma subunits, and contains a carbohydrate-binding module (CBM) that allows the complex to sense glycogen levels (PubMed: 17507534). Activation of AMPK via the beta-1 subunit promotes catabolic pathways like fatty acid oxidation and glucose uptake while inhibiting anabolic processes such as lipid synthesis (NCBI Gene: 5564). This makes it a significant therapeutic target for metabolic disorders, including type 2 diabetes and obesity. Small molecule activators targeting the beta-1 subunit specifically, such as A-769662, have demonstrated the potential to improve insulin sensitivity and reduce hepatic lipid accumulation (PubMed: 16751770). Beyond metabolism, PRKAB1-containing complexes are involved in regulating autophagy and cell growth, suggesting roles in cancer and aging-related diseases (StatPearls: AMPK). The subunit's unique structure allows for isoform-specific drug development, potentially minimizing side effects associated with broad AMPK activation.

Other names

AMPK beta-15'-AMP-activated protein kinase subunit beta-1AMPK subunit beta-1HAMPKbPRKAB1

Direct allosteric activation of the AMPK complex by binding to the Allosteric Drug and Metabolite (ADaM) site located between the alpha-subunit kinase domain and the beta-subunit carbohydrate-binding module (PubMed: 23791172).