Journal
FEBS LETTERS
Volume 579, Issue 6, Pages 1357-1364Publisher
WILEY
DOI: 10.1016/j.febslet.2005.01.030
Keywords
tocopherol cyclase; tocopherol; transgenic rapeseed; vitamin E; plastochromanol-8; 2,3-dimethyl-5-phytyl-1,4-benzoquinol
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Tocopherols, collectively known as vitamin E, are only synthesised in photosynthetic organisms. Tocopherol cyclase (TC) catalyses the formation of the chromanol headgroup of the various tocopherol isoforms. TCs from Arabidopsis and maize (Zea mays) were expressed in Escherichia coli and purified. Analysis of the enzymatic properties revealed similarities but also differences between the two enzymes. Overexpression of chimeric TC gene constructs in developing seeds of transgenic rapeseed plants enhanced and modified the relative abundance of individual tocochromanol species in the seed oil, indicating a regulatory function of the enzyme in prenyllipid metabolism. (C) 2005 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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