EC - Phytoene desaturase (neurosporene-forming)

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IntEnz Enzyme Nomenclature


Accepted name:
phytoene desaturase (neurosporene-forming)
Other names:
3-step phytoene desaturase
three-step phytoene desaturase
phytoene desaturase [ambiguous]
CrtI [ambiguous]
Systematic name:
15-cis-phytoene:acceptor oxidoreductase (neurosporene-forming)



This enzyme is involved in carotenoid biosynthesis and catalyses up to three desaturation steps (cf. EC [phytoene desaturase (ζ-carotene-forming)], EC [phytoene desaturase (3,4-didehydrolycopene-forming)], EC [phytoene desaturase (lycopene-forming)]). The enzyme is activated by FAD. NAD+, NADP+ or ATP show no activating effect [1].

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , DIAGRAM , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB


  1. Raisig, A., Bartley, G., Scolnik, P., Sandmann, G.
    Purification in an active state and properties of the 3-step phytoene desaturase from Rhodobacter capsulatus overexpressed in Escherichia coli.
    J. Biochem. 119: 559-564 (1996). [PMID: 8830054]
  2. Wang, C. W., Liao, J. C.
    Alteration of product specificity of Rhodobacter sphaeroides phytoene desaturase by directed evolution.
    J. Biol. Chem. 276: 41161-41164 (2001). [PMID: 11526111]

[EC created 2011]