Catalytic component of the GSH degradosomal complex involved in the degradation of glutathione (GSH) and other peptides containing a gamma-glu-X bond. Functions also as a dipeptidase with high specificity for Cys-Gly and no activity toward tri- or tetrapeptides (By similarity). Homodimer. Component of the GSH degradosomal complex. Belongs to the peptidase M20A family. Truncated N-terminus.