<human>:  Why is the AMPK protein called AMPK?
<bot>: AMPK stands for Adenosine Monophosphate-activated Protein Kinase. This enzyme is involved in cellular metabolism and energy homeostasis. AMPK is a heterotrimeric protein that is made up of three subunits: a catalytic alpha subunit, a regulatory beta subunit, and a gamma subunit. The alpha subunit is the one that is activated by AMP.