We are analyzing https://link.springer.com/article/10.1007/s00425-013-1846-8.

Title:
Multiple ketolases involved in light regulation of canthaxanthin biosynthesis in Nostoc punctiforme PCC 73102 | Planta
Description:
In the genome of Nostoc punctiforme PCC 73102, three functional β-carotene ketolase genes exist, one of the crtO and two of the crtW type. They were all expressed and their corresponding enzymes were functional inserting 4-keto groups into β-carotene as shown by functional pathway complementation in Escherichia coli. They all synthesized canthaxanthin but with different efficiencies. Canthaxanthin is the photoprotective carotenoid of N. punctiforme PCC 73102. Under high-light stress, its synthesis was enhanced. This was caused by up-regulation of the transcripts of two genes in combination. The first crtB-encoding phytoene synthase is the gate way enzyme of carotenogenesis resulting in an increased inflow into the pathway. The second was the ketolase gene crtW148 which in high light takes over β-carotene conversion into canthaxanthin from the other ketolases. The other ketolases were down-regulated under high-light conditions. CrtW148 was also exclusively responsible for the last step in 4-keto-myxoxanthophyll synthesis.
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Keywords {🔍}

article, google, scholar, cas, pubmed, sandmann, pcc, biosynthesis, gene, canthaxanthin, βcarotene, carotenoid, cyanobacterium, plant, ketolases, nostoc, punctiforme, access, carotenoids, light, synthesis, physiol, privacy, cookies, content, analysis, ketolase, crtw, pathway, photosynthesis, data, publish, search, regulation, functional, highlight, open, strain, synechococcus, takaichi, cell, information, log, journal, research, planta, january, schöpf, mautz, gerhard,

Topics {✒️}

month download article/chapter distinct β-carotene ketolases β-carotene hydroxylase gene multiple ketolases involved max-von-laue str jürgen mautz & gerhard sandmann β-carotene ketolases high-light stress crtb-encoding phytoene synthase real-time quantitative pcr real-time pcr analysis β-carotene conversion article planta aims full article pdf related subjects high light takes high-light conditions high-light upregulation carotenoid ketolase genes privacy choices/manage cookies light–dark regulation carotene patterns derives light stress 4-keto-myxoxanthophyll synthesis β-carotene ketolase gene mediates cyanobacterium anabaena sp cyanobacterium synechocystis sp check access instant access phytoene desaturase diversification mutated phytoene desaturase ketolase gene crtw148 housekeeping gene selection cyanobacterium synechococcus sp article schöpf european economic area roop rm ii modified product specificity gene expression patterns functional pathway complementation conditions privacy policy comparative quantification method light regulation accepting optional cookies ketocarotenoids biosynthetic pathway antibiotic-resistance cassettes goethe university frankfurt article log pcr products

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         headline:Multiple ketolases involved in light regulation of canthaxanthin biosynthesis in Nostoc punctiforme PCC 73102
         description:In the genome of Nostoc punctiforme PCC 73102, three functional β-carotene ketolase genes exist, one of the crtO and two of the crtW type. They were all expressed and their corresponding enzymes were functional inserting 4-keto groups into β-carotene as shown by functional pathway complementation in Escherichia coli. They all synthesized canthaxanthin but with different efficiencies. Canthaxanthin is the photoprotective carotenoid of N. punctiforme PCC 73102. Under high-light stress, its synthesis was enhanced. This was caused by up-regulation of the transcripts of two genes in combination. The first crtB-encoding phytoene synthase is the gate way enzyme of carotenogenesis resulting in an increased inflow into the pathway. The second was the ketolase gene crtW148 which in high light takes over β-carotene conversion into canthaxanthin from the other ketolases. The other ketolases were down-regulated under high-light conditions. CrtW148 was also exclusively responsible for the last step in 4-keto-myxoxanthophyll synthesis.
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            Cyanobacteria
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      headline:Multiple ketolases involved in light regulation of canthaxanthin biosynthesis in Nostoc punctiforme PCC 73102
      description:In the genome of Nostoc punctiforme PCC 73102, three functional β-carotene ketolase genes exist, one of the crtO and two of the crtW type. They were all expressed and their corresponding enzymes were functional inserting 4-keto groups into β-carotene as shown by functional pathway complementation in Escherichia coli. They all synthesized canthaxanthin but with different efficiencies. Canthaxanthin is the photoprotective carotenoid of N. punctiforme PCC 73102. Under high-light stress, its synthesis was enhanced. This was caused by up-regulation of the transcripts of two genes in combination. The first crtB-encoding phytoene synthase is the gate way enzyme of carotenogenesis resulting in an increased inflow into the pathway. The second was the ketolase gene crtW148 which in high light takes over β-carotene conversion into canthaxanthin from the other ketolases. The other ketolases were down-regulated under high-light conditions. CrtW148 was also exclusively responsible for the last step in 4-keto-myxoxanthophyll synthesis.
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         Canthaxanthin synthesis
         β-Carotene ketolases
         Carotenoid composition
         Cyanobacteria
         High-light stress
         Transcriptional regulation
         Plant Sciences
         Agriculture
         Ecology
         Forestry
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