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Glutathione contributes to: Cellular antioxidant defense Redox signaling Normal metabolism of certain drugs and environmental compounds Recycling of other antioxidants Immune-cell function Mitochondrial protection Protein and enzyme regulation Cellular resilience during oxidative stress Glutathione is not a magical cleanse
However, the relative contributions of ageing, genetic factors and stress to greying are not known in part owing to a lack of mechanistic understanding of the process
Same peptide, different routes
The glutamate residue is linked through its side-chain carboxyl, giving a gamma-glutamyl bond rather than a standard alpha-peptide bond, which is why the molecule resists most intracellular peptidases and is cleaved chiefly by gamma-glutamyl transpeptidase at the cell surface
