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• W2024156503 abstract "Abstract The tripeptide glutathione ( GSH ) is an important metabolite with a broad spectrum of functions, and its homeostasis is essential to maintain cellular redox poise and effective responses to stress in plants. In A rabidopsis GSH is synthesised in two successive enzymatic steps by γ‐glutamylcysteine synthetase ( GSH 1), localised exclusively in plastids, forming the pathway intermediate γ‐glutamylcysteine (γ‐ EC ), and then by glutathione synthetase ( GSH 2), which is located in both plastids and cytosol. This suggests a mechanism for γ‐ EC export from the plastids and, because the majority of GSH 2 transcripts (90%) encode the cytosolic isoform, it is speculated that the cytosol may be the main compartment for GSH biosynthesis. With the availability of knockout lethal mutants of GSH1 and GSH2 in A rabidopsis , we were able to manipulate the GSH biosynthetic pathway within cells through transgenic techniques. We successfully complemented the gsh1 and gsh2 null mutants with a cytosol‐targeted bacterial Ec GSHA and plastid‐targeted A rabidopsis GSH 2 protein, respectively, to wild‐type phenotypes. These transgenics were little affected under heavy metal (cadmium) or oxidative stress ( H 2 O 2 ) when compared to the wild type. Collectively, our data show that redirecting GSH 1 activity exclusively to the cytosol or restricting GSH biosynthesis to the plastids has no significant impact on development or stress resistance, suggesting efficient exchange of γ‐ EC and GSH between the plastid and cytosol compartments within cells." @default.
• W2024156503 created "2016-06-24" @default.
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• W2024156503 date "2013-05-20" @default.
• W2024156503 modified "2023-09-30" @default.
• W2024156503 title "Restricting glutamylcysteine synthetase activity to the cytosol or glutathione biosynthesis to the plastid is sufficient for normal plant development and stress tolerance" @default.
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• W2024156503 doi "https://doi.org/10.1111/plb.12033" @default.
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