p-AMPK?1 (S486) polyclonal antibody detects endogenous levels of AMPK?1 protein only when phosphorylated at Ser486. The antibody does not cross-react with phosphorylated AMPK?2 or other related proteins.
AMPK is a heterotrimeric complex comprising a catalytic ? subunit and regulatory ? and ? subunits. It protects cells from stresses that cause ATP depletion by switching off ATP-consuming biosynthetic pathways. AMPK is activated by high AMP and low ATP through a mechanism involving allosteric regulation, promotion of phosphorylation by an upstream protein kinase known as AMPK kinase, and inhibition of dephosphorylation. Activated AMPK can phosphorylate and regulate in vivo hydroxymethylglutaryl-CoA reductase and acetyl-CoA carboxylase, which are key regulatory enzymes of sterol synthesis and fatty acid synthesis, respectively. The human AMPK?1 and AMPK?2 genes encode 548 amino acid and 552 amino acid proteins, respectively. Human AMPK?1 encodes a 271 amino acid protein and human AMPK?2 encodes a 272 amino acid protein. The human AMPK?1 gene encodes a 331 amino acid protein. Human AMPK?2 and AMPK?3, which are 569 and 492 amino acid proteins, respectively, contain unique N-terminal domains and may participate directly in the binding of AMP within the AMPK complex.
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