Abstract
A gene has been cloned from Xanthophyllomyces dendrorhous by complementation of astaxanthin formation in a β-carotene accumulating mutant. It consists of 3,166 bp and contains 17 introns. For the β-carotene mutant ATCC 96815, a single point mutation in the splicing sequence of intron 8 was found. The resulting improper splicing of the mRNA results in an inactive protein. The cDNA of this β-carotene oxygenase encodes a cytochrome P450 monooxygenase belonging to the 3A subfamily. P450-specific domains were identified including a cytochrome P450 and an oxygen binding motif. Electrons are provided by a cytochrome P450 reductase. Functional characterization of the enzyme by genetic modification of X. dendrorhous demonstrated that this P450 monooxygenase is multifunctional catalyzing all steps from β-carotene to astaxanthin formation by oxygenation of carbon 3 and 4. The reaction sequence is first 4-ketolation of β-carotene followed by 3-hydroxylation. A hydroxylation mechanism at allylic carbon atoms has been proposed for the generation of 4-keto and 3-hydroxy groups at both β-ionone ends.
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This work was supported by grant QLK1-CT-2001-00780 from the European Commission.
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Ojima, K., Breitenbach, J., Visser, H. et al. Cloning of the astaxanthin synthase gene from Xanthophyllomyces dendrorhous (Phaffia rhodozyma) and its assignment as a β-carotene 3-hydroxylase/4-ketolase. Mol Genet Genomics 275, 148–158 (2006). https://doi.org/10.1007/s00438-005-0072-x
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DOI: https://doi.org/10.1007/s00438-005-0072-x