Plant GPXLs, containing cysteine in their active site domain, may have dual roles, acting as glutathione peroxidase and thioredoxin peroxidase functions ( 2 O 2 and organic hydroperoxides, as well as their involvement in regulating cellular redox homeostasis by maintaining thiol/disulfide or NADPH/NADP+ ratios ( Deficiency in the activity of either GSH1 or GSH2 impairs GSH production, negatively impacting plant growth and development
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The administration of high doses of lipoic acid by injection to rats decreased the activity of two biotin-dependent enzymes by about 30%-35% (122), but it is not known whether oral or intravenous lipoic acid supplementation substantially increases the requirement for biotin in humans (123)
RanGDP is converted to RanGTP by its chromatin-bound guanine exchange factor (GEF), Regulator of chromosome condensation 1 (RCC1) [8], while RanGAP1, present in the cytoplasm, catalyses the intrinsic GTPase activity of Ran, converting RanGTP to RanGDP [9, 10]
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While both glutathione and melatonin are crucial to restful sleep, they serve very different purposes
