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Bibcode:2008RepTx..26..107S

These compounds have various biological activities, including antimicrobial, antioxidant, anti-inflammatory, antidiabetic, and anticancer properties, as well as protective effects on the kidneys, nervous system, heart, and liver [164]

elegans exposed to oxidative stress via the glycineserine pathway that feeds one-carbon metabolism and the folate cycle, and in this way, improves the redox state of the animals

As you can probably tell from the name, glutamic acid makes glutathione an acid, and there is not a corresponding basic amino acid (lysine or arginine) in glutathione to neutralize it