Transfers a palmitate residue from the sn-1 position of a phospholipid to the N-linked hydroxymyristate on the proximal unit of lipid A or its precursors. Required for resistance to cationic antimicrobial peptides (CAMPs). Modifications of lipid A with a palmitate chain allow to evade host immune defenses by resisting antimicrobial peptides and attenuating the inflammatory response to infection triggered by lipopolysaccharide through the Toll-like receptor 4 (TLR4) signal transduction pathway. 1-hexadecanoyl-2-acyl-sn-glycero-3-phosphocholine + lipid A (E. coli) = a 2-acyl-sn-glycero-3-phosphocholine + hepta-acyl lipid A 1-hexadecanoyl-2-acyl-sn-glycero-3-phosphocholine + lipid IIA = a 2-acyl-sn-glycero-3-phosphocholine + lipid IIB 1-hexadecanoyl-2-acyl-sn-glycero-3-phosphocholine + lipid IVA (E. coli) = a 2-acyl-sn-glycero-3-phosphocholine + lipid IVB Homodimer. Regulated by the PhoP/PhoQ two-component regulatory system. Disruption of this gene increases outer membrane permeability in response to CAMP. Belongs to the lipid A palmitoyltransferase family. Truncated N-terminus.