Catalyzes the phospholipid dependent N-acylation of the N-terminal cysteine of apolipoprotein, the last step in lipoprotein maturation. Utilizes a two-step reaction via a ping-pong mechanism. Lnt undergoes covalent modification in the presence of phospholipids, resulting in a thioester acyl-enzyme intermediate. It then transfers the acyl chain to the amine group of the N-terminal diacylglyceryl-modified cysteine of apolipoprotein, leading to the formation of mature triacylated lipoprotein. a glycerophospholipid + N-terminal S-1,2-diacyl-sn-glyceryl-L-cysteinyl-[lipoprotein] = a 2-acyl-sn-glycero-3-phospholipid + H(+) + N-acyl-S-1,2-diacyl-sn-glyceryl-L-cysteinyl-[lipoprotein] Protein modification; lipoprotein biosynthesis (N-acyl transfer). Monomer. Essential. Depletion results in increased outer membrane permeability. Belongs to the CN hydrolase family. Apolipoprotein N-acyltransferase subfamily.