Phosphatidylinositol phosphates (PIP)
Class abbreviations
| Common Name | Lipid Class [LIPID MAPS] | Abbreviation |
|---|---|---|
| Subclasses phosphatidylinositol phosphates | ||
| Phosphatidylinositol-monophosphates | Glycerophosphoinositol monophosphates [GP07] | PIP |
| Phosphatidylinositol-3-phosphates | Glycerophosphoinositol monophosphates [GP07] | PIP[3’] |
| Phosphatidylinositol-4-phosphates | Glycerophosphoinositol monophosphates [GP07] | PIP[4’] |
| Phosphatidylinositol-5-phosphates | Glycerophosphoinositol monophosphates [GP07] | PIP[5’] |
| Phosphatidylinositol-bisphosphates | Glycerophosphoinositol bisphosphates [GP08] | PIP2 |
| Phosphatidylinositol-3,4-bisphosphates | Glycerophosphoinositol bisphosphates [GP08] | PIP2[3’,4’] |
| Phosphatidylinositol-3,5-bisphosphates | Glycerophosphoinositol bisphosphates [GP08] | PIP2[3’,5’] |
| Phosphatidylinositol-4,5-bisphosphates | Glycerophosphoinositol bisphosphates [GP08] | PIP2[4’,5’] |
| Phosphatidylinositol-trisphosphates | Glycerophosphoinositol trisphosphates [GP09] | PIP3 |
Specific rule for PIP species
When the functional group (P) is part of the class abbreviation (PI), e.g. PIP, its proven position is shown inside square brackets after the functional group, e.g. PIP[3’] 34:1, if more than one separated by a comma, e.g. PIP2[4’,5’] 38:4.
Hierarchical shorthand notation for PIP examples
Species level: Sum composition, Phosphate-position level: Position of phosphate group(s) on inositol ring, Molecular species level: Lipid species with identified acyl/alkyl-residues, sn-Position level: Fatty acyl/alkyl constituents at glycerol backbone are indicated by a slash, Full structure level: Molecular species with constituents and functional groups including positions.
| Bond type | Species level | Phosphate-position level | Molecular species level | sn-Position level | Full structure level |
|---|---|---|---|---|---|
| Diacyl | PIP 36:1 | PIP[3’] 36:1 | PIP[3’] 16:0_18:1 | PIP[3’] 16:0/18:1 |
PIP[3’] 16:0/18:1(9Z)
|
| Diacyl | PIP2 38:4 | PIP2[4’,5’] 38:4 | PIP2[4’,5’] 18:0_20:4 | PIP2[4’,5’] 18:0/20:4 | PIP2[4’,5’] 18:0/20:4(4Z,8Z,11Z,14Z) |