Catalyzes the transfer of laurate from lauroyl-acyl carrier protein (ACP) to Kdo(2)-lipid IV(A) to form Kdo(2)-(lauroyl)-lipid IV(A). Has 10 fold selectivity for lauroyl-ACP over myristoyl-ACP. In vitro, can also catalyze a slow second acylation reaction leading to the formation of Kdo(2)-(dilauroyl)-lipid IV(A). alpha-Kdo-(2->4)-alpha-Kdo-(2->6)-lipid IVA + dodecanoyl-[ACP] = dodecanoyl-(Kdo)2-lipid IVA + holo-[ACP] Glycolipid biosynthesis; KDO(2)-lipid A biosynthesis; KDO(2)-lipid A from CMP-3-deoxy-D-manno-octulosonate and lipid IV(A): step 3/4. Bacterial outer membrane biogenesis; lipopolysaccharide biosynthesis. Monomer. Is expressed at all temperatures, but accumulation of htrB transcripts slightly declines with raising temperature. Thus, its expression is not induced by heat shock. Inactivation leads to bacterial death at temperatures above 33 degrees Celsius. Phenotype at nonpermissive temperatures includes an arrest of cell division followed by the formation of bulges or filaments. Belongs to the LpxL/LpxM/LpxP family.