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The X-linked G6PD deficiency is the most common genetic enzyme disorder in humans, affecting an estimated 400 million people worldwide

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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)

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10.1038/s41598-019-52837-8 Sci