AMP-activated protein kinase beta subunit (AMPK-β)

AMP-activated protein kinase beta subunit is one of two regulatory subunits (beta-1 and beta-2, encoded by PRKAB1 and PRKAB2) of the AMP-activated protein kinase (AMPK) heterotrimeric complex. AMPK is a central cellular energy sensor and regulator that responds to increases in AMP/ADP during metabolic stress by activating ATP-producing and inhibiting ATP-consuming processes. The beta subunit serves as a scaffold connecting the catalytic alpha and regulatory gamma subunits, is required for complex stability, and modulates activation by facilitating conformational changes in response to cellular adenine nucleotide levels. It is myristoylated at its N-terminus (for cellular localization and activity modulation), and its isoforms contribute to tissue- and context-specific roles of AMPK. AMPK—including its beta subunit—is a well-validated therapeutic target for metabolic diseases such as type 2 diabetes, obesity, and has implications in cancer, inflammation, and cardiovascular diseases. Drugs such as metformin activate AMPK (requiring the intact beta subunit), demonstrating its pharmacological relevance. If you require information on a specific beta isoform (beta-1 or beta-2), this can be further specified.

Other names

PRKAB1PRKAB2AMPK betaAMPKβ5’-AMP-activated protein kinase beta subunit

Allosteric activation through AMP/ADP binding to the AMPK gamma subunit (modulated by the beta subunit). Phosphorylation of the AMPK alpha subunit at Thr172 (facilitated by beta/gamma subunit conformation). Indirect activation by upstream kinase (LKB1, CaMKK2) via structural support of the beta subunit. Drugs such as metformin activate AMPK kinases indirectly via cellular energy stress, altering the adenine nucleotide ratio.