The olsA gene mediates the synthesis of an ornithine lipid in Pseudomonas aeruginosa during growth under phosphate-limiting conditions, but is not involved in antimicrobial peptide susceptibility.
Lewenza S, Falsafi R, Bains M, Rohs P, Stupak J, Sprott GD, Hancock RE. FEMS Microbiol Lett. 2011 Jul; 320(2):95-102. Epub 2011 May 11.