5.5.1.19: lycopene beta-cyclase
This is an abbreviated version!
For detailed information about lycopene beta-cyclase, go to the full flat file.
Word Map on EC 5.5.1.19
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5.5.1.19
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phytoene
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desaturase
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carotene
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carotenogenic
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carotenogenesis
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astaxanthin
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epsilon-cyclase
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xanthophyl
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blakeslea
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trispora
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violaxanthin
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uredovora
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provitamin
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ketolase
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pluvialis
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xanthophyllomyces
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delta-carotene
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neoxanthin
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decaprenoxanthin
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gamma-carotene
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alpha-carotene
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crtyb
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prolycopene
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dendrorhous
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beta-ring
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neurosporene
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nutrition
- 5.5.1.19
- phytoene
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desaturase
- carotene
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carotenogenic
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carotenogenesis
- astaxanthin
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epsilon-cyclase
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xanthophyl
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blakeslea
- trispora
- violaxanthin
- uredovora
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provitamin
-
ketolase
- pluvialis
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xanthophyllomyces
- delta-carotene
- neoxanthin
- decaprenoxanthin
- gamma-carotene
- alpha-carotene
- crtyb
- prolycopene
- dendrorhous
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beta-ring
- neurosporene
- nutrition
Reaction
Synonyms
beta-LCY, beta-LCY1, capsanthin-capsorubin synthase, CCS, chromoplast-specific lycopene beta cyclase, CrtL, CrtL-b, CrtL-e, CrtY, crtYB, CruA, CruP, CYC-B, DcLCYB1, LCY, LCY-B, LCY-beta, LCYb, LCYb1, LCYB2, LCYb3, LCYb4, LYCB, lycopene beta cyclase, lycopene beta-cyclase 1, lycopene cyclase, phytoene synthase/lycopene cyclase, SSO2904
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General Information
General Information on EC 5.5.1.19 - lycopene beta-cyclase
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evolution
MpLCYb belongs to the LCYb1 (chloroplast-specific) family rather than to the LCYb2 (chromoplast-specific) family, hylogenetic tree
malfunction
metabolism
physiological function
additional information
the cruA::aadA mutant does not produce carotenoids with cyclic end groups. The cruA mutant shows a severe growth defect. Wild-type Synechococcus sp. PCC 7002 produces large amounts of the dicyclic carotenoids beta-carotene and zeaxanthin as well as the monocyclic myxoxanthophyll but does not accumulate lycopene or gamma-carotene. The cruA mutant strain accumulates significant amounts of lycopene and gamma-carotene
malfunction
transgenic plants with higher or reduced levels of DcLcyb1 have incremented or reduced levels of chlorophyll, total carotenoids and beta-carotene in leaves and in the storage roots, respectively. In addition, changes in the expression of DcLcyb1 are accompanied by a modulation in the expression of key endogenous carotenogenic genes
malfunction
down-regulation of sweetpotato lycopene beta-cyclase gene enhances tolerance to abiotic stress in transgenic calli
malfunction
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the suppression of enzyme expression leads to lower expression levels of genes in the carotenoid biosynthesis pathway and to reduced accumulation of carotenoids, chlorophyll, and abscisic acid
metabolism
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the enzyme is downregulated before fruit ripening through a tightly regulated physiological mechanism
metabolism
the enzyme is involved in the pathway of carotenoid biosynthesis, overview
metabolism
the enzyme is involved in the astaxanthin biosynthesis pathway
metabolism
Phaffia rhodozyma CGMCC As2.1557
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the enzyme is involved in the astaxanthin biosynthesis pathway
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lycopene beta-cyclase is a key enzyme involved directly in the synthesis of alpha-carotene and beta-carotene through the cyclization of lycopene. The enzyme does not possess an organ specific function and modulates carotenoid gene expression and accumulation in carrot leaves and storage roots. DcLcyb1 participates in the regulation of endogenous DcPsy1, DcPsy2 and DcLcyb2 carotenogenic genes
physiological function
Citrus sp.
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regulatory effect of Lycb-1 gene on plant carotenoid metabolism and fruit transcriptome, overview
physiological function
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the enzyme confers salt and drought stress tolerance in Nicotiana tabacum
physiological function
the enzyme expression produces an increment in carotenoid and chlorophyll levels through the up-regulation of endogenous genes. Tobacco plants with higher recombinant enzyme expression levels show an increase in biomass and fitness
physiological function
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the lycopene beta-cyclase gene LCYB2 enhances carotenoid contents and abiotic stress tolerance through positive regulation of carotenoid and abscisic acid biosynthesis pathways in transgenic sweetpotato
physiological function
the salt tolerance of the enzyme is ascribed to the enhanced carotenoid content for its reactive oxygen species scavenging ability, photoprotection and membrane stabilization
physiological function
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transgenic tomato lines show increased levels of beta-carotene in ripe fruit and tolerance to 2-(4-chlorophenylthio)triethylamine
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beta-carotene is the most abundant carotenoid in the anthers of the species reaching 93% of the total carotenoids in LA2405
additional information
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beta-carotene is the most abundant carotenoid in the anthers of the species reaching 95% of the total carotenoids in P86
additional information
DcLCYB1 has conserved motifs related to lycopene beta-cyclases such as a cyclase motif I and II, a LCY specific motif, a conserved region beta-LCY, a di-nucleotide binding site, a charged region and the beta-LCY motif, beta-LCY CAD region, domains described as essential for lycopene beta-cyclase activity
additional information
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DcLCYB1 has conserved motifs related to lycopene beta-cyclases such as a cyclase motif I and II, a LCY specific motif, a conserved region beta-LCY, a di-nucleotide binding site, a charged region and the beta-LCY motif, beta-LCY CAD region, domains described as essential for lycopene beta-cyclase activity
additional information
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beta-carotene is the most abundant carotenoid in the anthers of the species reaching 95% of the total carotenoids in P86
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additional information
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beta-carotene is the most abundant carotenoid in the anthers of the species reaching 93% of the total carotenoids in LA2405
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