Mitochondrial glutamate/H(+) symporter. Responsible for the transport of glutamate from the cytosol into the mitochondrial matrix with the concomitant import of a proton (PubMed:11897791). Plays a role in the control of glucose-stimulated insulin secretion (By similarity). H(+)(in) + L-glutamate(in) = H(+)(out) + L-glutamate(out) Expressed at high levels in brain, liver, and pancreas. The disease is caused by variants affecting the gene represented in this entry. Belongs to the mitochondrial carrier (TC 2.A.29) family.