PASK Antibody – Mouse Monoclonal

This gene encodes a member of the serine/threonine kinase family that contains two PAS domains. Expression of this gene is regulated by glucose, and the encoded protein plays a role in the regulation of insulin gene expression. Downregulation of this gene may play a role in type 2 diabetes. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Nov 2011]

PASK: Serine/threonine-protein kinase involved in energy homeostasis and protein translation. Phosphorylates EEF1A1, GYS1, PDX1 and RPS6. Probably plays a role under changing environmental conditions (oxygen, glucose, nutrition), rather than under standard conditions. Acts as a sensor involved in energy homeostasis: regulates glycogen synthase synthesis by mediating phosphorylation of GYS1, leading to GYS1 inactivation. May be involved in glucose-stimulated insulin production in pancreas and regulation of glucagon secretion by glucose in alpha cells; however such data require additional evidences. May play a role in regulation of protein translation by phosphorylating EEF1A1, leading to increase translation efficiency. May also participate to respiratory regulation. Ubiquitously expressed, with slightly higher expression in brain, prostate and testis. Reduced expression was found in placenta. Present in germ cells of testis and in the midpiece of sperm tails. Protein kinase activity is inhibited by the first PAS domain: binding of an unidentified ligand desinhibits the protein kinase activity. May be activated by autophosphorylation on Thr-1161 and Thr-1165 (PubMed:11459942). The activating role of autophosphorylation at Thr-1161 is unclear: according to a report, autophosphorylation at Thr-1161 does not play a major role in activation (PubMed:20943661). Autophosphorylation is enhanced upon phosphatidylinositol monophosphate (phosphatidylinositol 4-phosphate) binding and inhibited upon phosphatidylinositol bi- and tri-phosphate binding. In contrast, phosphorylation of target proteins is inhibited upon all phosphatidylinositol-binding (phosphatidylinositol mono- bi- and tri-phosphate). Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: EC 2.7.11.1; Kinase, protein; Protein kinase, Ser/Thr (non-receptor); Protein kinase, CAMK; CAMK group; CAMKL family; PASK subfamily

Chromosomal Location of Human Ortholog: 2q37.3

Cellular Component: Golgi apparatus; cytoplasm; nucleus

Molecular Function: protein serine/threonine kinase activity; signal transducer activity; protein binding; phosphoinositide binding; ATP binding

Biological Process: regulation of respiratory gaseous exchange; positive regulation of translation; protein amino acid autophosphorylation; signal transduction; protein amino acid phosphorylation; negative regulation of glycogen biosynthetic process