Figure 5.

Structure, physical and chemical properties of lipids native to E. coli and those introduced from other sources. See Fig. 4 for pathways of synthesis and genes encoding enzymes responsible for the synthesis of each lipid except N-acyl PE, which is discussed under section 7.2.2. The glycerol backbone (red) shown in ester linkage to fatty acids (aliphatic chains R₁-R₄) at the sn-1 and sn-2 positions and in either phosphodiester linkage for phospholipids or in a glycosidic linked for glycolipids at the sn-3 position. Head groups are color coded to indicate the charge nature of each head group.