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The 5'-AMP-activated protein kinase (AMPK), a member of the SNF1 (sucrose non-fermentor) kinase family (1). AMPK is a heterotrimeric protein comprising alpha (63 kDa), beta (38 kDa) and gamma (38 kDa) subunits (2). The alpha subunit is the catalytic subunit, while beta and gamma are non-catalytic subunits, although they have been found to interact with the active subunit in liver. AMPK regulates fatty acid and sterol synthesis by phosphorylation of acetyl-CoA as well as cholesterol synthesis via phosphorylation and inactivation of hydroxymethylglutaryl-CoA reductase (3). AMPK beta-1 mediates the association of the AMPK heterotrimeric complex in vitro (2). Two isoforms have been found and the difference in expression patterns indicates tissue-specific roles for these isoforms (4).