Journal
FEBS LETTERS
Volume 580, Issue 19, Pages 4718-4722Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2006.07.055
Keywords
carotenoid biosynthesis; carotene hydroxylases; Xanthophylls; Arabidopsis
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The first dedicated step in plant xanthophyll biosynthesis is carotenoid hydroxylation. In Arabidopsis thaliana, this reaction is performed by both heme (LUT1 and LUT5) and non-heme (CHY1 and CHY2) hydroxylases. No mutant completely abolishing alpha- or beta-carotene hydroxylation has been described to date. We constructed double and triple mutant combinations in CHY1, CHY2, LUTI, LUT5 and LUT2 (lycopene epsiloncyclase). In chy1chy2lut2, 80% of leaf carotenoids is represented by beta-carotene. In chy1chy2lut5, beta-carotene hydroxylation is completely abolished, while hydroxylation of the beta-ring of alpha-carotene is still observed. The data are consistent with a role of LUT5 in beta-ring hydroxylation, and with the existence of an additional hydroxylase, acting on the beta-ring of alpha-, but not beta-carotene. (c) 2006 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies.
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