sentences:  One of the primary roles for phosphatidylethanolamine in bacterial membranes is to spread out the negative charge caused by anionic membrane phospholipids.In the bacterium "E. coli", phosphatidylethanolamine play a role in supporting lactose permeases active transport of lactose into the cell, and may play a role in other transport systems as well.Phosphatidylethanolamine plays a role in the assembly of lactose permease and other membrane proteins.