| phosphatidylinositol 4,5-diphosphate | <biochemistry> A phosphoinositide present in all eukaryotic cells, particularly in the plasma membrane. It is the major substrate for receptor-stimulated phosphoinositidase c, with the consequent formation of inositol 1,4,5-triphosphate and diacylglycerol, and probably also for receptor-stimulated inositol phospholipid 3-kinase. (12 Dec 1998) |
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| phosphatidylinositol 4-phosphate | <biochemistry> The intermediate in the biosynthesis of phosphatidylinositol 4,5-bisphosphate from phosphatidylinositol. (20 Sep 2002) |
| phosphatidylinositol 4-phosphate phosphatase | <enzyme> From human erythrocyte membranes Registry number: EC 3.1.3.- Synonym: ptdins-4p-phosphatase, phosphatidylinositol-4-phosphate monoesterase, ptdins4p monoesterase (26 Jun 1999) |
| phosphatidylinositol-ceramide phosphoinositol transferase | <enzyme> Involved in biosynthesis of inositol-containing sphingolipids; isolated from saccharomyces cerevisiae Registry number: EC 2.4.1.- Synonym: ipc synthase (26 Jun 1999) |
| phosphatidylinositol synthase | <enzyme> An enzyme that catalyses the reaction of CDP-diacylglycerol with inositol to form CMP and phosphatidylinositol; found in the endoplasmic reticulum. (20 Sep 2002) |
| N-acetylglucosaminyl-phosphatidylinositol de-N-acetylase | <enzyme> Involved in formation of glycosylphosphatidyl inositol membrane anchors in trypanosoma brucei; forms glucosaminyl-phosphatidylinositol Registry number: EC 3.5.1.- Synonym: glcnac-pi de-n-acetylase, pig-l protein, phosphatidylinositol glycan class l protein, n-acetylglucosaminyl-phosphatidylinositol deacetylase (26 Jun 1999) |
| 1-phosphatidylinositol 3-kinase | <enzyme> An enzyme that catalyses the conversion of phosphatidylinositol to phosphatidylinositol 3-phosphate. This is the first committed step in the biosynthesis of phosphatidylinositol 3,4-bisphosphate and phosphatidylinositol 3,4,5-trisphosphate. This pathway is thought to play a critical role in DNA repair, v(d)j recombination and cell cyle checkpoints.37. Chemical name: ATP:1-phosphatidyl-1D-myo-inositol 3-phosphotransferase Registry number: EC 2.7.1.137 (12 Dec 1998) |
| 1-phosphatidylinositol 4-kinase | <enzyme> An enzyme that catalyses the conversion of phosphatidylinositol to phosphatidylinositol 4-phosphate, the first committed step in the biosynthesis of phosphatidylinositol 4,5-bisphosphate. Chemical name: ATP:1-phosphatidyl-1D-myo-inositol-4-phosphate Registry number: EC 2.7.1.67 (12 Dec 1998) |