Record Information
Version1.0
StatusDetected and Quantified
Creation Date2020-12-10 22:03:34 UTC
Update Date2022-08-31 06:16:49 UTC
Metabolite IDMMDBc0000811
Metabolite Identification
Common NamePI(18:0/18:2(9Z,12Z))
DescriptionPI(18:0/18:2(9Z,12Z))is a phosphatidylinositol. Phosphatidylinositols are important lipids, both as a key membrane constituent and as a participant in essential metabolic processes, both directly and via a number of metabolites. Phosphatidylinositols are acidic (anionic) phospholipids that consist of a phosphatidic acid backbone, linked via the phosphate group to inositol (hexahydroxycyclohexane). Phosphatidylinositols can have many different combinations of fatty acids of varying lengths and saturation attached at the C-1 and C-2 positions. Fatty acids containing 18 and 20 carbons are the most common.PI(18:0/18:2(9Z,12Z)), in particular, consists of one octadecanoyl chain to the C-1 atom, and one 9Z,12Z-octadecadienoyl to the C-2 atom. The inositol group that is part of every phosphatidylinositol lipid is covalently linked to the phosphate group that acts as a bridge to the lipid tail. In most organisms, the stereochemical form of this inositol is myo-D-inositol (with one axial hydroxyl in position 2 with the remainder equatorial), although other forms can be found in certain plant phosphatidylinositols. Phosphatidylinositol can be phosphorylated by a number of different kinases that place the phosphate moiety on positions 4 and 5 of the inositol ring, although position 3 can also be phosphorylated by a specific kinase. Seven different isomers are known, but the most important in both quantitative and biological terms are phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate. Phosphatidylinositol and the phosphatidylinositol phosphates are the main source of diacylglycerols that serve as signaling molecules, via the action of phospholipase C enzymes. While most phospholipids have a saturated fatty acid on C-1 and an unsaturated fatty acid on C-2 of the glycerol backbone, the fatty acid distribution at the C-1 and C-2 positions of glycerol within phospholipids is continually in flux, owing to phospholipid degradation and the continuous phospholipid remodeling that occurs while these molecules are in membranes. PIs contain almost exclusively stearic acid at carbon 1 and arachidonic acid at carbon 2. PIs composed exclusively of non-phosphorylated inositol exhibit a net charge of -1 at physiological pH. Molecules with phosphorylated inositol (such as PIP, PIP2, PIP3, etc.) are termed polyphosphoinositides. The polyphosphoinositides are important intracellular transducers of signals emanating from the plasma membrane. The synthesis of PI involves CDP-activated 1,2-diacylglycerol condensation with myo-inositol.
Structure
Synonyms
ValueSource
1-Octadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phospho-(1'-myo-inositol)HMDB
1-Stearoyl-2-linoleoyl-sn-glycero-3-phosphoinositolHMDB
Phosphatidylinositol(18:0/18:2)HMDB
Phosphatidylinositol(18:0/18:2n6)HMDB
Phosphatidylinositol(18:0/18:2W6)HMDB
Phosphatidylinositol(36:2)HMDB
PI(18:0/18:2)HMDB
PI(18:0/18:2n6)HMDB
PI(18:0/18:2W6)HMDB
PI(36:2)HMDB
Pino(18:0/18:2)HMDB
Pino(18:0/18:2n6)HMDB
Pino(18:0/18:2W6)HMDB
Pino(36:2)HMDB
1-Octadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phosphoinositolHMDB
PI(18:0/18:2(9Z,12Z))Lipid Annotator
Molecular FormulaC45H83O13P
Average Mass863.1065
Monoisotopic Mass862.557129254
IUPAC Name[(2R)-2-[(9Z,12Z)-octadeca-9,12-dienoyloxy]-3-(octadecanoyloxy)propoxy]({[(1s,3R)-2,3,4,5,6-pentahydroxycyclohexyl]oxy})phosphinic acid
Traditional Name(2R)-2-[(9Z,12Z)-octadeca-9,12-dienoyloxy]-3-(octadecanoyloxy)propoxy([(1s,3R)-2,3,4,5,6-pentahydroxycyclohexyl]oxy)phosphinic acid
CAS Registry NumberNot Available
SMILES
[H][C@@](COC(=O)CCCCCCCCCCCCCCCCC)(COP(O)(=O)O[C@H]1C(O)C(O)C(O)[C@@H](O)C1O)OC(=O)CCCCCCC\C=C/C\C=C/CCCCC
InChI Identifier
InChI=1S/C45H83O13P/c1-3-5-7-9-11-13-15-17-19-21-23-25-27-29-31-33-38(46)55-35-37(36-56-59(53,54)58-45-43(51)41(49)40(48)42(50)44(45)52)57-39(47)34-32-30-28-26-24-22-20-18-16-14-12-10-8-6-4-2/h12,14,18,20,37,40-45,48-52H,3-11,13,15-17,19,21-36H2,1-2H3,(H,53,54)/b14-12-,20-18-/t37-,40?,41-,42?,43?,44?,45-/m1/s1
InChI KeyKZVRAFHIKMDULK-PDPKURFXSA-N