Hydrolyzes alpha-ketoglutaramate (a-KGM) to alpha-ketoglutarate (alpha-KG) and ammonia (specific activity 6.65 umol/min/mg), has weak activity on L-glutamine, almost no activity on deaminated glutathione (dGSH) and none on glutathione. May function as a metabolite repair enzyme. a monoamide of a dicarboxylate + H2O = a dicarboxylate + NH4(+) Belongs to the carbon-nitrogen hydrolase superfamily. NIT1/NIT2 family.