NAD(+)-dependent glutamate dehydrogenase which degrades glutamate to ammonia and alpha-ketoglutarate. H2O + L-glutamate + NAD(+) = 2-oxoglutarate + H(+) + NADH + NH4(+) Homotetramer. Interacts with NNK1. Phosphorylated by a complex containing the NNK1 kinase. Leads to rapamycin resistance when grown on glutamate as the sole nitrogen source. Present with 7400 molecules/cell in log phase SD medium. Belongs to the Glu/Leu/Phe/Val dehydrogenases family.