The fadL gene codes for an outer membrane-bound fatty acids transport protein that facilitates the import of long chain fatty acids into the periplasmic space where they are protonated and then partitioned at the inner membrane (with the ionic head pointing towards the periplasmic space). Protonated fatty acids are unable to pass through the inner membrane into the cytosol and require the assistance of the FadD protein. The fadD gene codes for an inner membrane-associated long chain acyl-CoA synthetase enzyme in E. coli, which catalyses the addition of a CoA moiety to the fatty acids and their subsequent transport across the inner membrane into the cytosol. FadD is therefore required both for the transport of LCFAs through the inner membrane into the cytosol and their activation for metabolism via the β-oxidation pathway. By overexpressing FadL and FadD, we aim to enhance LCFA uptake to boost the subsequent conversion of fatty acyl-CoA to ALA.