A novel carotenoid, 4-keto-α-carotene, as an unexpected by-product during genetic engineering of carotenogenesis in rice callus
The carotenoid pathway was reconstituted and extended by genetic engineering in rice callus. In addition to astaxanthin and precursors, a novel carotenoid accumulated and was identified as 4-keto-α-carotene due to the ketolase transgene crtW. •Carotenoid biosynthesis was genetically engineered into...
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| Published in: | Phytochemistry (Oxford) Vol. 98; pp. 85 - 91 |
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01-02-2014
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| Abstract | The carotenoid pathway was reconstituted and extended by genetic engineering in rice callus. In addition to astaxanthin and precursors, a novel carotenoid accumulated and was identified as 4-keto-α-carotene due to the ketolase transgene crtW.
•Carotenoid biosynthesis was genetically engineered into rice enodsperm callus.•The extended carotenoid pathway was to astaxanthin.•A 4-keto-α-carotene was synthesised as a by product.
Rice endosperm is devoid of carotenoids because the initial biosynthetic steps are absent. The early carotenogenesis reactions were constituted through co-transformation of endosperm-derived rice callus with phytoene synthase and phytoene desaturase transgenes. Subsequent steps in the pathway such as cyclization and hydroxylation reactions were catalyzed by endogenous rice enzymes in the endosperm. The carotenoid pathway was extended further by including a bacterial ketolase gene able to form astaxanthin, a high value carotenoid which is not a typical plant carotenoid. In addition to astaxanthin and precursors, a carotenoid accumulated in the transgenic callus which did not fit into the pathway to astaxanthin. This was subsequently identified as 4-keto-α-carotene by HPLC co-chromatography, chemical modification, mass spectrometry and the reconstruction of its biosynthesis pathway in Escherichia coli. We postulate that this keto carotenoid is formed from α-carotene which accumulates by combined reactions of the heterologous gene products and endogenous rice endosperm cyclization reactions. |
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| AbstractList | Rice endosperm is devoid of carotenoids because the initial biosynthetic steps are absent. The early carotenogenesis reactions were constituted through co-transformation of endosperm-derived rice callus with phytoene synthase and phytoene desaturase transgenes. Subsequent steps in the pathway such as cyclization and hydroxylation reactions were catalyzed by endogenous rice enzymes in the endosperm. The carotenoid pathway was extended further by including a bacterial ketolase gene able to form astaxanthin, a high value carotenoid which is not a typical plant carotenoid. In addition to astaxanthin and precursors, a carotenoid accumulated in the transgenic callus which did not fit into the pathway to astaxanthin. This was subsequently identified as 4-keto- alpha -carotene by HPLC co-chromatography, chemical modification, mass spectrometry and the reconstruction of its biosynthesis pathway in Escherichia coli. We postulate that this keto carotenoid is formed from alpha -carotene which accumulates by combined reactions of the heterologous gene products and endogenous rice endosperm cyclization reactions. The carotenoid pathway was reconstituted and extended by genetic engineering in rice callus. In addition to astaxanthin and precursors, a novel carotenoid accumulated and was identified as 4-keto-α-carotene due to the ketolase transgene crtW. •Carotenoid biosynthesis was genetically engineered into rice enodsperm callus.•The extended carotenoid pathway was to astaxanthin.•A 4-keto-α-carotene was synthesised as a by product. Rice endosperm is devoid of carotenoids because the initial biosynthetic steps are absent. The early carotenogenesis reactions were constituted through co-transformation of endosperm-derived rice callus with phytoene synthase and phytoene desaturase transgenes. Subsequent steps in the pathway such as cyclization and hydroxylation reactions were catalyzed by endogenous rice enzymes in the endosperm. The carotenoid pathway was extended further by including a bacterial ketolase gene able to form astaxanthin, a high value carotenoid which is not a typical plant carotenoid. In addition to astaxanthin and precursors, a carotenoid accumulated in the transgenic callus which did not fit into the pathway to astaxanthin. This was subsequently identified as 4-keto-α-carotene by HPLC co-chromatography, chemical modification, mass spectrometry and the reconstruction of its biosynthesis pathway in Escherichia coli. We postulate that this keto carotenoid is formed from α-carotene which accumulates by combined reactions of the heterologous gene products and endogenous rice endosperm cyclization reactions. Rice endosperm is devoid of carotenoids because the initial biosynthetic steps are absent. The early carotenogenesis reactions were constituted through co-transformation of endosperm-derived rice callus with phytoene synthase and phytoene desaturase transgenes. Subsequent steps in the pathway such as cyclization and hydroxylation reactions were catalyzed by endogenous rice enzymes in the endosperm. The carotenoid pathway was extended further by including a bacterial ketolase gene able to form astaxanthin, a high value carotenoid which is not a typical plant carotenoid. In addition to astaxanthin and precursors, a carotenoid accumulated in the transgenic callus which did not fit into the pathway to astaxanthin. This was subsequently identified as 4-keto-α-carotene by HPLC co-chromatography, chemical modification, mass spectrometry and the reconstruction of its biosynthesis pathway in Escherichia coli. We postulate that this keto carotenoid is formed from α-carotene which accumulates by combined reactions of the heterologous gene products and endogenous rice endosperm cyclization reactions. |
| Author | Sandmann, Gerhard Zhu, Changfu Christou, Paul Canela, Ramon Breitenbach, Jürgen Rivera, Sol M. Bai, Chao Capell, Teresa |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/24393458$$D View this record in MEDLINE/PubMed |
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| Keywords | Carotenoid biosynthesis Genetic engineering Astaxanthin Rice endosperm 4-keto-α-carotene |
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| Snippet | The carotenoid pathway was reconstituted and extended by genetic engineering in rice callus. In addition to astaxanthin and precursors, a novel carotenoid... Rice endosperm is devoid of carotenoids because the initial biosynthetic steps are absent. The early carotenogenesis reactions were constituted through... |
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| SubjectTerms | 4-keto-α-carotene Astaxanthin Carotenoid biosynthesis Carotenoids - biosynthesis Carotenoids - chemistry Carotenoids - metabolism Escherichia coli Genetic Engineering Oryza - genetics Oryza sativa Rice endosperm |
| Title | A novel carotenoid, 4-keto-α-carotene, as an unexpected by-product during genetic engineering of carotenogenesis in rice callus |
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