DAGKaDiacylglycerol kinase accessory domain (presumed)
|SMART accession number:||SM00045|
|Description:||Diacylglycerol (DAG) is a second messenger that acts as a protein kinase C activator. DAG can be produced from the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) by a phosphoinositide-specific phospholipase C and by the degradation of phosphatidylcholine (PC) by a phospholipase C or the concerted actions of phospholipase D and phosphatidate phosphohydrolase. This domain might either be an accessory domain or else contribute to the catalytic domain. Bacterial homologues are known.|
|Interpro abstract (IPR000756):|
Protein phosphorylation, which plays a key role in most cellular activities, is a reversible process mediated by protein kinases and phosphoprotein phosphatases. Protein kinases catalyse the transfer of the gamma phosphate from nucleotide triphosphates (often ATP) to one or more amino acid residues in a protein substrate side chain, resulting in a conformational change affecting protein function. Phosphoprotein phosphatases catalyse the reverse process. Protein kinases fall into three broad classes, characterised with respect to substrate specificity [(PUBMED:3291115)]:
Protein kinase function is evolutionarily conserved from Escherichia coli to human [(PUBMED:12471243)]. Protein kinases play a role in a multitude of cellular processes, including division, proliferation, apoptosis, and differentiation [(PUBMED:12368087)]. Phosphorylation usually results in a functional change of the target protein by changing enzyme activity, cellular location, or association with other proteins. The catalytic subunits of protein kinases are highly conserved, and several structures have been solved [(PUBMED:15078142)], leading to large screens to develop kinase-specific inhibitors for the treatments of a number of diseases [(PUBMED:15320712)].
Diacylglycerol (DAG) is a second messenger that acts as a protein kinase C activator. The DAG kinase domain is assumed to be an accessory domain. Upon cell stimulation, DAG kinase converts DAG into phosphatidate, initiating the resynthesis of phosphatidylinositols and attenuating protein kinase C activity. It catalyses the reaction: ATP + 1,2-diacylglycerol = ADP + 1,2-diacylglycerol 3-phosphate. The enzyme is stimulated by calcium and phosphatidylserine and phosphorylated by protein kinase C. This domain is always associated with IPR001206.
|GO process:||protein kinase C-activating G-protein coupled receptor signaling pathway (GO:0007205)|
|GO function:||diacylglycerol kinase activity (GO:0004143)|
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