May be required for glutathione transport into developing seeds. an alpha-amino acid + an N-terminal (5-L-glutamyl)-[peptide] = 5-L-glutamyl amino acid + N-terminal L-alpha-aminoacyl-[peptide] glutathione + H2O = L-cysteinylglycine + L-glutamate an S-substituted glutathione + H2O = an S-substituted L-cysteinylglycine + L-glutamate Sulfur metabolism; glutathione metabolism. Associated with the plasma membrane and cell wall. Expressed in roots, immature trichomes and pollen. In developing siliques, specifically expressed in the embryo, endosperm, outer integument and a small portion of the funiculus. By glutathione. No visible phenotype under normal growth conditions. Belongs to the gamma-glutamyltransferase family.