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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:
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.
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 ...
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.
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 ]
Glycosylphosphatidylinositol phospholipase D (EC 3.1.4.50, GPI-PLD, glycoprotein phospholipase D, phosphatidylinositol phospholipase D, phosphatidylinositol-specific phospholipase D) is an enzyme with systematic name glycoprotein-phosphatidylinositol phosphatidohydrolase.
There are four classes, separated according to the type of reaction they catalyze. In particular, phospholipase A 1 (PLA 1) specifically catalyzes the cleavage at the sn-1 position of phospholipids, forming a fatty acid and a lysophospholipid. [3] [4] Phospholipase A 1 cleaves phospholipid at the sn-1 position forming a lysophospholipid and a ...
The enzyme phospholipase A 2 (EC 3.1.1.4, PLA 2, systematic name phosphatidylcholine 2-acylhydrolase) catalyses the cleavage of fatty acids in position 2 of phospholipids, hydrolyzing the bond between the second fatty acid "tail" and the glycerol molecule: phosphatidylcholine + H 2 O = 1-acylglycerophosphocholine + a carboxylate