Hi Omar, I never heard of a selection system with a lipid. I am not even sure TAG and any of its metabolites is toxic for E. coli, and that therefore you can select any bacteria with this.
They are not toxic, in fact someone in my lab was able to transform E.coli with some key genes, making them really good TAG-producers. But now unfortunately I need kind of a gene-promotor that is actived or represed with TAG.
Anyway thanks for your contribution. I hope someone can give me a solution. I am trying 24/7 !!!!!!!