Responsible for the aerobic transport of the dicarboxylates fumarate, L- and D-malate and to a lesser extent succinate, from the periplasm across the inner membrane. Subject to CRP-mediated catabolite repression. Repressed in the absence of oxygen, induced in the stationary phase and approximately 2-fold by citrate and C4-dicarboxylates. Cells lacking this gene are only able to grow after a 2-day lag period on D-malate as sole carbon source. Belongs to the dicarboxylate/amino acid:cation symporter (DAACS) (TC 2.A.23) family.