2.4.1.182 cytosol - 5829 2.4.1.182 membrane LpxB activity is dependent upon the bulk surface concentration of ist substrates in a mixed micelle assay system, suggesting that catalysis occurs at the membrane interface 16020 2.4.1.182 membrane LpxB is a membrane-associated lipid A enzyme 16020 2.4.1.182 membrane membrane-associated. LpxB is a membrane surface active enzyme. The hydrophobic patch (V66, V68, L69, L72, L75, and L76) is essential for productive membrane association or substrate binding 16020 2.4.1.182 mitochondrion - 5739 2.4.1.182 additional information enzyme possibly interacts with membranes due to its extreme hydrophobic reaction product - 2.4.1.182 additional information lipid X levels in mitochondria are 3 and 48fold higher than in chloroplasts or whole cell homogenates, respectively. Lipid X is undetectable in the plasma membrane - 2.4.1.182 outer membrane - 19867