EC Number   |
Natural Substrates |
|---|
    1.3.5.6 | 7,9,9'-tricis-neurosporene + a quinone |
- |
| 1.3.5.6 | 7,9,9'-tricis-neurosporene + a quinone |
catalyzed by zeta-carotene desaturase CrtQa, very poorly by CrtQb |
| 1.3.5.6 | 9,9'-dicis-zeta-carotene + 2 quinone |
- |
| 1.3.5.6 | 9,9'-dicis-zeta-carotene + 2 quinone |
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 |
| 1.3.5.6 | 9,9'-dicis-zeta-carotene + 2 quinone |
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 |
| 1.3.5.6 | 9,9'-dicis-zeta-carotene + a quinone |
- |
| 1.3.5.6 | 9,9'-dicis-zeta-carotene + a quinone |
catalyzed by zeta-carotene desaturases CrtQa and CrtQb |
| 1.3.5.6 | more |
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 |
| 1.3.5.6 | neurosporene + a quinone |
- |
| 1.3.5.6 | phytoene + quinone |
- |
