Research Article

Predicting Glycerophosphoinositol Identities in Lipidomic Datasets Using VaLID (Visualization and Phospholipid Identification)—An Online Bioinformatic Search Engine

Figure 2

Component and composite structural PI and features used to calculate masses. Exact and average masses for all theoretically possible PI and species were calculated from the masses of every component possibility: (top panel) the phosphoglycerol backbone, (left panel) sn-1 and sn-2 hydroxyl residues (lyso-lipids) and sn-1 and sn-2 fatty chains ranging from 0 to 30 carbons with up to six unsaturations, considering ester, ether, or vinyl ether linkages to the phosphoglycerol backbone, and (right panel) PI polar headgroups and all biologically relevant phosphorylation possibilities. The bottom panel provides one composite PI example.