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A number of these enzymes have specificity for phosphoinositides. Of the phosphoinositide-specific phospholipase C enzymes, C-beta is regulated by heterotrimeric G protein-coupled receptors, while the closely related C-gamma-1 (PLCG1; MIM 172420) and C-gamma-2 enzymes are controlled by receptor tyrosine kinases.
Phospholipase cleavage sites. An enzyme that displays both PLA 1 and PLA 2 activities is called a phospholipase B. A phospholipase is an enzyme that hydrolyzes phospholipids [1] into fatty acids and other lipophilic substances. There are four major classes, termed A, B, C, and D, which are distinguished by the type of reaction which they catalyze:
This family consists of lysophospholipase / phospholipase B (EC 3.1.1.5) and cytosolic phospholipase A 2 which also has a C2 domain InterPro: IPR000008. Phospholipase B enzymes catalyse the release of fatty acids from lysophospholipids and are capable in vitro of hydrolyzing all phospholipids extractable from yeast cells. [ 1 ]
For example, a PLA 1 enzyme with a long lid domain (22-23 amino acids) and a long B9 domain (18-19 amino acids) constitute an extracellular PLA 1 exhibiting triacylglycerol hydrolase activity. [13] In contrast, a PLA 1 enzyme that is considered more selective will have a short lid and B9 domain that span 7-12 and 12-13 amino acids, respectively.
The gene codes for the enzyme phospholipase C β2. The enzyme catalyzes the formation of inositol 1,4,5-trisphosphate and diacylglycerol from phosphatidylinositol 4,5-bisphosphate . This reaction uses calcium as a cofactor and plays an important role in the intracellular transduction of many extracellular signals.
Phospholipase C (PLC) is a class of membrane-associated enzymes that cleave phospholipids just before the phosphate group (see figure). It is most commonly taken to be synonymous with the human forms of this enzyme, which play an important role in eukaryotic cell physiology , in particular signal transduction pathways.
1-Phosphatidylinositol-4,5-bisphosphate phosphodiesterase beta-3 is an enzyme that in humans is encoded by the PLCB3 gene. [5] [6] The gene codes for the enzyme phospholipase C β3. The enzyme catalyzes the formation of inositol 1,4,5-trisphosphate and diacylglycerol from phosphatidylinositol 4,5-bisphosphate. This reaction uses calcium as a ...
These enzymes belong to a larger superfamily of Phospholipase C. Other families of phospholipase C enzymes have been identified in bacteria and trypanosomes. Phospholipases C are phosphodiesterases. Phospholipase Cs participate in phosphatidylinositol 4,5-bisphosphate (PIP 2) metabolism and lipid signaling pathways
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