Mitochondrial glutamate/H(+) symporter (By similarity). Responsible for the transport of glutamate from the cytosol into the mitochondrial matrix with the concomitant import of a proton (Probable). Plays a role in the control of glucose-stimulated insulin secretion (PubMed:19584051). H(+)(in) + L-glutamate(in) = H(+)(out) + L-glutamate(out) Detected in insulin-secreting beta-cells and pancreatic islets (at the protein level). Belongs to the mitochondrial carrier (TC 2.A.29) family.