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Notably, GSH binding motif is not conserved among the other seleno-GPxs (GPx2, GPx3, GPx4, and GPx6) justifying their abilities to use wide variety of thiols like cysteine, protein thiols, mercaptoethanol, and dithiothreitol in addition to GSH as reducing equivalent for the catalysis [8, 17, 18]
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Copper coordination chemistry, briefly What makes GHK-Cu distinctive is how the tripeptide binds copper(II): the imidazole nitrogen of histidine, the N-terminal amine, and backbone nitrogens form a coordination geometry that holds the metal ion with high affinity