Phytol from Degradation of Chlorophyll Feeds Biosynthesis of Tocopherols
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چکیده
منابع مشابه
Phytol from Degradation of Chlorophyll Feeds Biosynthesis of Tocopherols.
Tocopherols, a subclassof tocochromanols that contain a phytol attached to the head group, act as antioxidants to protect lipids from oxidative damage, a particularly important function in chloroplasts and for seed longevity (reviewed in Maeda and DellaPenna, 2007). One pathway for tocopherol biosynthesis involves de novo synthesis from geranylgeranyl-diphosphate; the other pathway uses phytols...
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Phytyl diphosphate (PDP) is the prenyl precursor for tocopherol biosynthesis. Based on recent genetic evidence, PDP is supplied to the tocopherol biosynthetic pathway primarily by chlorophyll degradation and sequential phytol phosphorylation. Three enzymes of Arabidopsis (Arabidopsis thaliana) are known to be capable of removing the phytol chain from chlorophyll in vitro: chlorophyllase1 (CLH1)...
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Phytol from chlorophyll degradation can be phosphorylated to phytyl-phosphate and phytyl-diphosphate, the substrate for tocopherol (vitamin E) synthesis. A candidate for the phytyl-phosphate kinase from Arabidopsis thaliana (At1g78620) was identified via a phylogeny-based approach. This gene was designated VITAMIN E DEFICIENT6 (VTE6) because the leaves of the Arabidopsis vte6 mutants are tocoph...
متن کاملAbsorption of phytol from dietary chlorophyll in the rat.
The fate of ingested chlorophyll-particularly of the phytol portion of the molecule-was studied. Uniformly (14)C-labeled pheophytin a (the Mg-free derivative of chlorophyll a) was prepared from an extract of tobacco leaves grown in (14)CO(2), and was administered by stomach tube to rats in which the thoracic duct had been cannulated. Only about 2% of the administered radioactivity was absorbed ...
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ژورنال
عنوان ژورنال: The Plant Cell
سال: 2015
ISSN: 1040-4651,1532-298X
DOI: 10.1105/tpc.15.00860