Catalyzes the first step in the biosynthesis of ornithine lipids, which are phosphorus-free membrane lipids. Catalyzes the 3-hydroxyacyl-acyl carrier protein-dependent acylation of ornithine to form lyso-ornithine lipid (LOL). a (3R)-hydroxyacyl-[ACP] + L-ornithine = a lyso-ornithine lipid + H(+) + holo-[ACP] Lipid metabolism. Deletion of the gene abrogates lyso-ornithine lipid and ornithine lipid synthesis. It does not affect resistance to bactericidal peptides or permeability of the outer membrane. Does not influence pro-inflammatory responses or the ability to multiply intracellularly and generate chronic infections. Belongs to the acetyltransferase family. OlsB subfamily.