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Record Information
Version5.0
StatusExpected but not Quantified
Creation Date2020-06-08 20:11:44 UTC
Update Date2022-11-30 19:53:43 UTC
HMDB IDHMDB0240667
Secondary Accession NumbersNone
Metabolite Identification
Common NamePI(18:0/18:1(9Z))
DescriptionPI(18:0/18:1(9Z)) 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(18:0/18:0), in particular, consists of one chain of stearic acid at the C-1 position and one chain of oleic acid at the C-2 position. 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 is especially abundant in brain tissue, where it can amount to 10% of the phospholipids, but it is present in all tissues and cell types. There is usually less of it than of phosphatidylcholine, phosphatidylethanolamine, and phosphatidylserine. In animal tissues, phosphatidylinositol is the primary source of the arachidonic acid required for the biosynthesis of eicosanoids, including prostaglandins, via the action of the enzyme phospholipase A2. 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 sources of diacylglycerols that serve as signalling 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 remodelling 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
Data?1591648663
Synonyms
ValueSource
1-18:0-2-18:1-PhosphatidylinositolChEBI
1-Octadecanoyl-2-(9Z)-octadecenoyl-sn-glycero-3-phospho-1D-myo-inositolChEBI
1-Octadecanoyl-2-(9Z-octadecenoyl)-glycero-3-phospho-(1'-myo-inositol)ChEBI
1-Stearoyl-2-oleoyl-phosphatidylinositolChEBI
18:0-18:1-PIChEBI
1-Stearoyl-2-oleoyl-gpiHMDB
1-Stearoyl-2-oleoyl-glycero-3-phospho-(1'-myo-inositol)HMDB
1-Stearoyl-2-oleoyl-glycero-3-phospho-(1’-myo-inositol)HMDB
1-Stearoyl-2-oleoyl-sn-glycero-3-phospho-D-myo-inositolHMDB
1-Stearoyl-2-oleoyl-sn-glycero-3-phosphoinositolHMDB
GPI(18:0/18:1(9Z))HMDB
GPI(18:0/18:1)HMDB
GPI(18:0/18:1n9)HMDB
GPI(18:0/18:1W9)HMDB
GPI(36:1)HMDB
PI(18:0/18:1)HMDB
PI(18:0/18:1n9)HMDB
PI(18:0/18:1W9)HMDB
PI(36:1)HMDB
Phosphatidylinositol(18:0/18:1(9Z))HMDB
Phosphatidylinositol(18:0/18:1)HMDB
Phosphatidylinositol(18:0/18:1n9)HMDB
Phosphatidylinositol(18:0/18:1W9)HMDB
Phosphatidylinositol(36:1)HMDB
PI(18:0/18:1(9Z))ChEBI
Chemical FormulaC45H85O13P
Average Molecular Weight865.1224
Monoisotopic Molecular Weight864.572779318
IUPAC Name[(2R)-2-[(9Z)-octadec-9-enoyloxy]-3-(octadecanoyloxy)propoxy]({[(1S,2R,3R,4S,5S,6R)-2,3,4,5,6-pentahydroxycyclohexyl]oxy})phosphinic acid
Traditional Name(2R)-2-[(9Z)-octadec-9-enoyloxy]-3-(octadecanoyloxy)propoxy([(1S,2R,3R,4S,5S,6R)-2,3,4,5,6-pentahydroxycyclohexyl]oxy)phosphinic acid
CAS Registry Number58116-17-9
SMILES
[H][C@@](COC(=O)CCCCCCCCCCCCCCCCC)(COP(O)(=O)O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](O)[C@H]1O)OC(=O)CCCCCCC\C=C/CCCCCCCC
InChI Identifier
InChI=1S/C45H85O13P/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/h18,20,37,40-45,48-52H,3-17,19,21-36H2,1-2H3,(H,53,54)/b20-18-/t37-,40-,41-,42+,43-,44-,45-/m1/s1
InChI KeyYOBFISPJJWPPTK-BAAZTTAESA-N
Chemical Taxonomy
Description Belongs to the class of organic compounds known as 1-phosphatidyl-1d-myo-inositols. These are lipids containing a myo-inositol attached to the phosphate group of a glycerol-3-phosphate moiety, and two acyl chains linked to the glycerol at the O1- and O2- positions, through ester linkages.
KingdomOrganic compounds
Super ClassLipids and lipid-like molecules
ClassGlycerophospholipids
Sub ClassGlycerophosphoinositols
Direct Parent1-phosphatidyl-1D-myo-inositols
Alternative Parents
Substituents
  • 1-phosphatidyl-1d-myo-inositol
  • Inositol phosphate
  • Cyclohexanol
  • Fatty acid ester
  • Dialkyl phosphate
  • Cyclitol or derivatives
  • Dicarboxylic acid or derivatives
  • Organic phosphoric acid derivative
  • Phosphoric acid ester
  • Alkyl phosphate
  • Fatty acyl
  • Cyclic alcohol
  • Secondary alcohol
  • Carboxylic acid ester
  • Polyol
  • Carboxylic acid derivative
  • Alcohol
  • Hydrocarbon derivative
  • Organic oxide
  • Organic oxygen compound
  • Organooxygen compound
  • Carbonyl group
  • Aliphatic homomonocyclic compound
Molecular FrameworkAliphatic homomonocyclic compounds
External Descriptors
  • 1-octadecanoyl-2-acyl-sn-glycero-3-phospho-1D-myo-inositol (CHEBI:77346 )
Ontology
Physiological effect
Disposition
Process
RoleNot Available
Physical Properties
StateNot Available
Experimental Molecular Properties
PropertyValueReference
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Experimental Chromatographic PropertiesNot Available
Predicted Molecular Properties
PropertyValueSource
logP7.71ALOGPS
logP10.41ChemAxon
logS-6.2ALOGPS
pKa (Strongest Acidic)1.83ChemAxon
pKa (Strongest Basic)-3.6ChemAxon
Physiological Charge-1ChemAxon
Hydrogen Acceptor Count9ChemAxon
Hydrogen Donor Count6ChemAxon
Polar Surface Area209.51 ŲChemAxon
Rotatable Bond Count41ChemAxon
Refractivity230.09 m³·mol⁻¹ChemAxon
Polarizability102.79 ųChemAxon
Number of Rings1ChemAxon
BioavailabilityNoChemAxon
Rule of FiveNoChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Predicted Chromatographic Properties

Predicted Collision Cross Sections

PredictorAdduct TypeCCS Value (Å2)Reference
DeepCCS[M+H]+287.08330932474
DeepCCS[M-H]-285.25830932474
DeepCCS[M-2H]-318.49830932474
DeepCCS[M+Na]+292.68930932474

Predicted Kovats Retention Indices

Underivatized

MetaboliteSMILESKovats RI ValueColumn TypeReference
PI(18:0/18:1(9Z))[H][C@@](COC(=O)CCCCCCCCCCCCCCCCC)(COP(O)(=O)O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](O)[C@H]1O)OC(=O)CCCCCCC\C=C/CCCCCCCC4969.3Standard polar33892256
PI(18:0/18:1(9Z))[H][C@@](COC(=O)CCCCCCCCCCCCCCCCC)(COP(O)(=O)O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](O)[C@H]1O)OC(=O)CCCCCCC\C=C/CCCCCCCC5304.2Standard non polar33892256
PI(18:0/18:1(9Z))[H][C@@](COC(=O)CCCCCCCCCCCCCCCCC)(COP(O)(=O)O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](O)[C@H]1O)OC(=O)CCCCCCC\C=C/CCCCCCCC6252.4Semi standard non polar33892256
Spectra

MS/MS Spectra

Spectrum TypeDescriptionSplash KeyDeposition DateSourceView
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - PI(18:0/18:1(9Z)) 10V, Negative-QTOFsplash10-03di-0000000090-574f87e05b2f5d4f88532021-09-22Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - PI(18:0/18:1(9Z)) 20V, Negative-QTOFsplash10-03di-0000000090-574f87e05b2f5d4f88532021-09-22Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - PI(18:0/18:1(9Z)) 40V, Negative-QTOFsplash10-015a-0060970010-e074325dd9421c554f5f2021-09-22Wishart LabView Spectrum
Biological Properties
Cellular LocationsNot Available
Biospecimen LocationsNot Available
Tissue LocationsNot Available
Pathways
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
Phenol Explorer Compound IDNot Available
FooDB IDNot Available
KNApSAcK IDNot Available
Chemspider ID26326254
KEGG Compound IDNot Available
BioCyc IDCPD-8324
BiGG IDNot Available
Wikipedia LinkNot Available
METLIN IDNot Available
PubChem CompoundNot Available
PDB IDNot Available
ChEBI ID77346
Food Biomarker OntologyNot Available
VMH IDNot Available
MarkerDB IDNot Available
Good Scents IDNot Available
References
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General ReferencesNot Available