Its defining structural feature is the gamma-glutamyl linkage: the glutamate residue is joined through its side-chain carboxyl rather than the usual alpha-peptide bond, which makes the molecule resistant to most intracellular peptidases and means it is cleaved almost exclusively by gamma-glutamyl transpeptidase at the outer cell surface (Zhang, Forman and Choi, Methods in Enzymology, 2005)
Emerging evidence suggests that treatment with the dual GLP-1 and GIP receptor agonist, tirzepatide, might prove even more potent than a GLP-1RA alone, to ameliorate NAFLD
PMC 2878077
References J Glutathione
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