MetaCyc Reaction: [no EC number assigned]

Superclasses: Reactions Classified By Conversion Type Simple Reactions Chemical Reactions
Reactions Classified By Substrate Small-Molecule Reactions

Enzymes and Genes:

Arabidopsis thaliana col : 15-cis-phytoene desaturase Inferred from experiment : PDS
Synechococcus elongatus PCC 7942 : 15-cis phytoene desaturase Inferred from experiment : pds

Sub-reaction of: 15-cis-phytoene + 2 a plastoquinone = 9,15,9'-tri-cis-ζ-carotene + 2 a plastoquinol

In Pathway: trans-lycopene biosynthesis II (plants)

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction in which it was curated.

Mass balance status: Balanced.

Standard Gibbs Free Energy (ΔrG in kcal/mol): 24.23999 Inferred by computational analysis [Latendresse13]

This enzyme is involved in carotenoid biosynthesis in plants and cyanobacteria. The enzyme from Synechococcus can also use NAD+ and NADP+ as electron acceptor under anaerobic conditions. The enzyme from Gentiana lutea shows no activity with NAD+ or NADP+ [Breitenbach01].

This is one of two reactions catalyzed successively by the enzyme. The overall reaction is

15-cis-phytoene + 2 a plastoquinone = 9,15,9'-tri-cis-ζ-carotene + 2 a plastoquinol

Citations: [Schneider97b, Fraser93, Breitenbach05]

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Unification Links: KEGG:R09653 , Rhea:30194

Created 17-Mar-2011 by Caspi R , SRI International


Breitenbach01: Breitenbach J, Zhu C, Sandmann G (2001). "Bleaching herbicide norflurazon inhibits phytoene desaturase by competition with the cofactors." J Agric Food Chem 49(11);5270-2. PMID: 11714315

Breitenbach05: Breitenbach J, Sandmann G (2005). "zeta-Carotene cis isomers as products and substrates in the plant poly-cis carotenoid biosynthetic pathway to lycopene." Planta 220(5);785-93. PMID: 15503129

Fraser93: Fraser PD, Linden H, Sandmann G (1993). "Purification and reactivation of recombinant Synechococcus phytoene desaturase from an overexpressing strain of Escherichia coli." Biochem J 291 ( Pt 3);687-92. PMID: 8489496

Latendresse13: Latendresse M. (2013). "Computing Gibbs Free Energy of Compounds and Reactions in MetaCyc."

Schneider97b: Schneider C, Boger P, Sandmann G (1997). "Phytoene desaturase: heterologous expression in an active state, purification, and biochemical properties." Protein Expr Purif 10(2);175-9. PMID: 9226712

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 19.0 on Tue Oct 6, 2015, biocyc14.