Cys-Gly metallo-di-peptidase%3B forms a complex with Dug2p and Dug3p to degrade glutathione (GSH) and other peptides containing a gamma-glu-X bond in an alternative pathway to GSH degradation by gamma-glutamyl transpeptidase (Ecm38p)%3B human homolog CNDP2 can complement yeast dug1 mutant