Pseudogene resulting from a nucleotide deletion that introduces a premature stop codon at position 66. This is the N-terminal fragment. The intact protein (AC A0A140NCB4) hydrolyzes deaminated glutathione (dGSH, 2-oxoglutaramate) to alpha-ketoglutarate (alpha-KG) and cysteinylglycine, has less activity against alpha-ketoglutaramate (a-KGM) and no activity on glutathione or L-glutamine (By similarity). May function as a metabolite repair enzyme (By similarity). Belongs to the carbon-nitrogen hydrolase superfamily. NIT1/NIT2 family. Could be the product of a pseudogene. Extended N-terminus.