Phytoene desaturase (zeta-carotene-forming) (, ''CrtIa'', ''2-step phytoene desaturase (ambiguous)'', ''two-step phytoene desaturase (ambiguous)'') is an
enzyme
Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. A ...
with
systematic name A systematic name is a name given in a systematic way to one unique group, organism, object or chemical substance, out of a specific population or collection. Systematic names are usually part of a nomenclature.
A semisystematic name or semitrivial ...
''15-cis-phytoene:acceptor oxidoreductase (zeta-carotene-forming)''.
This enzyme
catalyses the following
chemical reaction
A chemical reaction is a process that leads to the IUPAC nomenclature for organic transformations, chemical transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the pos ...
: 15-cis-
phytoene
Phytoene () is a 40-carbon intermediate in the biosynthesis of carotenoids. The synthesis of phytoene is the first committed step in the synthesis of carotenoids in plants. Phytoene is produced from two molecules of geranylgeranyl pyrophosphate (G ...
+ 2 acceptor
all-trans-zeta-carotene + 2 reduced acceptor (overall reaction)
: (1a) 15-cis-phytoene + acceptor
all-trans-phytofluene + reduced acceptor
: (1b) all-trans-phytofluene + acceptor
all-trans-zeta-carotene + reduced acceptor
The enzyme is involved in
carotenoid
Carotenoids (), also called tetraterpenoids, are yellow, orange, and red organic compound, organic pigments that are produced by plants and algae, as well as several bacteria, and Fungus, fungi. Carotenoids give the characteristic color to pumpki ...
biosynthesis.
See also
*
Phytoene desaturase (lycopene-forming)
*
Phytoene desaturase (neurosporene-forming)
*
15-Cis-phytoene desaturase
15-''cis''-phytoene desaturases (''PDS'', ''plant-type phytoene desaturases'') (, ''15-cis-phytoene:plastoquinone oxidoreductase''), are enzymes involved in the carotenoid biosynthesis in plants and cyanobacteria. Phytoene desaturases are membrane- ...
*
Phytoene desaturase (3,4-didehydrolycopene-forming)
References
External links
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EC 1.3.99