Component of an export pathway for enterobactin (PubMed:12068807). Overexpression reduces intracellular arabinose concentrations (PubMed:22952739). Mutant is unable to secrete enterobactin efficiently. It secretes little, if any, enterobactin, but elevated levels of enterobactin breakdown products 2,3-dihydroxybenzoylserine (DHBS) monomer, dimer and trimer. Belongs to the major facilitator superfamily. EntS (TC 2.A.1.38) family.