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7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
9,9'-dicis-zeta-carotene + 2 quinone
7,9,7',9'-tetracis-lycopene + 2 quinol
9,9'-dicis-zeta-carotene + a quinone
7,9,9'-tricis-neurosporene + a quinol
neurosporene + a quinone
lycopene + a quinol
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-
-
-
?
neurosporene + decyl-plastoquinone
lycopene + decyl-plastoquinol
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-
-
-
?
neurosporene + decyl-ubiquinone
lycopene + decyl-ubiquinone
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-
-
-
?
phytoene + quinone
7,9,9'-tricis-neurosporene + quinol
zeta-carotene + 2 AH2 + 2 O2
lycopene + 2 A + 4 H2O
zeta-carotene + 2 decyl-plastoquinone
lycopene + 2 decyl-plastoquinol
-
zeta-carotene desaturase has no preference for certain isomers. The nature of the isomers formed during catalysis depends strictly on the isomeric composition of the substrate. Different lycopene isomers are formed, including substantial amounts of the all-trans form, together with 7,7',9,9'-tetracis prolycopene via the corresponding neurosporene isomers
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-
?
zeta-carotene + 2 decyl-ubiquinone
lycopene + 2 decyl-ubiquinone
-
zeta-carotene desaturase has no preference for certain isomers. The nature of the isomers formed during catalysis depends strictly on the isomeric composition of the substrate. Different lycopene isomers are formed, including substantial amounts of the all-trans form, together with 7,7',9,9'-tetracis prolycopene via the corresponding neurosporene isomers
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-
?
zeta-carotene + 2 quinone
lycopene + 2 quinol
-
zeta-carotene desaturase has no preference for certain isomers. The nature of the isomers formed during catalysis depends strictly on the isomeric composition of the substrate. Different lycopene isomers are formed, including substantial amounts of the all-trans form, together with 7,7',9,9'-tetracis prolycopene via the corresponding neurosporene isomers
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-
?
zeta-carotene + a quinone
neurosporene + a quinol
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-
-
-
?
zeta-carotene + AH2 + O2
neurosporene + A + H2O
-
-
-
?
zeta-carotene + decyl-plastoquinone
neurosporene + decyl-plastoquinol
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-
-
-
?
zeta-carotene + decyl-ubiquinone
neurosporene + decyl-ubiquinone
-
-
-
-
?
additional information
?
-
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
-
mutant activity
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-
?
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
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-
-
-
?
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
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-
-
-
?
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
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-
-
-
?
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
-
catalyzed by zeta-carotene desaturase CrtQa, very poorly by CrtQb
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-
?
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
-
catalyzed by zeta-carotene desaturase CrtQa, very poorly by CrtQb
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-
?
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
-
-
-
-
?
7,9,9'-tricis-neurosporene + a quinone
7,9,7',9'-tetracis-lycopene + a quinol
-
-
-
-
?
9,9'-dicis-zeta-carotene + 2 quinone
7,9,7',9'-tetracis-lycopene + 2 quinol
-
the expression of zeta-carotene desaturase paralleles plastid terminal oxidase (PTOX, quinol:oxygen oxidoreductase) and zeta-carotene desaturase. The three genes are expressed when carotinoid biosynthesis is enhanced during fruit ripening
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-
?
9,9'-dicis-zeta-carotene + 2 quinone
7,9,7',9'-tetracis-lycopene + 2 quinol
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-
-
-
?
9,9'-dicis-zeta-carotene + 2 quinone
7,9,7',9'-tetracis-lycopene + 2 quinol
-
the expression of zeta-carotene desaturase paralleles plastid terminal oxidase (PTOX, quinol:oxygen oxidoreductase) and zeta-carotene desaturase. The three genes are expressed when carotinoid biosynthesis is enhanced during fruit ripening. Tomato ghost mutant with impaired plastid terminal oxidase accumulate phytoene in leaves and fruits
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-
?
9,9'-dicis-zeta-carotene + a quinone
7,9,9'-tricis-neurosporene + a quinol
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-
-
-
?
9,9'-dicis-zeta-carotene + a quinone
7,9,9'-tricis-neurosporene + a quinol
-
-
-
-
?
9,9'-dicis-zeta-carotene + a quinone
7,9,9'-tricis-neurosporene + a quinol
-
-
-
-
?
9,9'-dicis-zeta-carotene + a quinone
7,9,9'-tricis-neurosporene + a quinol
-
catalyzed by zeta-carotene desaturases CrtQa and CrtQb
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-
?
9,9'-dicis-zeta-carotene + a quinone
7,9,9'-tricis-neurosporene + a quinol
-
catalyzed by zeta-carotene desaturases CrtQa and CrtQb
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-
?
phytoene + quinone
7,9,9'-tricis-neurosporene + quinol
-
via phytofluene and zeta-carotene
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-
?
phytoene + quinone
7,9,9'-tricis-neurosporene + quinol
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-
-
-
?
phytoene + quinone
7,9,9'-tricis-neurosporene + quinol
-
-
-
-
?
zeta-carotene + 2 AH2 + 2 O2
lycopene + 2 A + 4 H2O
-
-
-
-
?
zeta-carotene + 2 AH2 + 2 O2
lycopene + 2 A + 4 H2O
-
-
-
-
?
zeta-carotene + 2 AH2 + 2 O2
lycopene + 2 A + 4 H2O
-
-
-
?
zeta-carotene + 2 AH2 + 2 O2
lycopene + 2 A + 4 H2O
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-
-
?
additional information
?
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-
the deduced protein possesses a dinucleotide-binding site at the N-terminus and a carotenoid-binding domain at the C-terminus
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?
additional information
?
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-
the deduced protein sequence possesses a dinucleotide-binding site at the N-terminus and a carotenoid-binding domain at the C-terminus
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-
?
additional information
?
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-
the deduced protein possesses a dinucleotide-binding site at the N-terminus and a carotenoid-binding domain at the C-terminus
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-
?
additional information
?
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-
the deduced protein sequence possesses a dinucleotide-binding site at the N-terminus and a carotenoid-binding domain at the C-terminus
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-
?
additional information
?
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strain PCC 7120 contains two completely unrelated zeta-carotene desaturases CrtQa and CrtQb, which differ in their preferred utilization of zeta-carotene Z isomers. CrtQa converts zeta-carotene isomers that are poorly metabolized by CrtQb and CrtQa still possesses the Z to E isomerase function of the ancestral desaturase CrtI. CrtQb is an enzyme with one molecule of tightly bound FAD and acts as a dehydrogenase transferring hydrogen to oxidized plastoquinone. CrtQb yields only trace amounts of 7,9-Z neurosporene and 7,9,7',9'-Z lycopene
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-
?
additional information
?
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zeta-carotene desaturase CrtQb converts (9Z)-zeta-carotene efficiently into (7Z,9Z)-neurosporene but stops at this stage without substantial lycopene formation. (all-E)-zeta-carotene cannot be converted by CrtQb. Similarly to (9Z)-zeta-carotene, the (all-E)-isomer is efficiently converted by CrtQa, substrate specificities, overview
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-
?
additional information
?
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-
strain PCC 7120 contains two completely unrelated zeta-carotene desaturases CrtQa and CrtQb, which differ in their preferred utilization of zeta-carotene Z isomers. CrtQa converts zeta-carotene isomers that are poorly metabolized by CrtQb and CrtQa still possesses the Z to E isomerase function of the ancestral desaturase CrtI. CrtQb is an enzyme with one molecule of tightly bound FAD and acts as a dehydrogenase transferring hydrogen to oxidized plastoquinone. CrtQb yields only trace amounts of 7,9-Z neurosporene and 7,9,7',9'-Z lycopene
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-
?
additional information
?
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zeta-carotene desaturase CrtQb converts (9Z)-zeta-carotene efficiently into (7Z,9Z)-neurosporene but stops at this stage without substantial lycopene formation. (all-E)-zeta-carotene cannot be converted by CrtQb. Similarly to (9Z)-zeta-carotene, the (all-E)-isomer is efficiently converted by CrtQa, substrate specificities, overview
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-
?