MetaCyc Reaction:

Superclasses: Reactions Classified By Conversion TypeSimple ReactionsChemical ReactionsComposite Reactions
Reactions Classified By SubstrateSmall-Molecule Reactions

EC Number:

Enzymes and Genes:

Methylomonas sp. 16a: diapophytoene desaturaseInferred from experiment: crtN

The direction shown, i.e. which substrates are on the left and right sides, is in accordance with the Enzyme Commission system.

Most BioCyc compounds have been protonated to a reference pH value of 7.3. Please see the PGDB Concepts Guide for more information.

Mass balance status: Balanced.

Enzyme Commission Primary Name: 4,4′-diapophytoene desaturase (4,4′-diapolycopene-forming)

Enzyme Commission Synonyms: dehydrosqualene desaturase, CrtN, 4,4'-diapophytoene:FAD oxidoreductase

Taxonomic Range: Bacteria

15-cis-4,4'-diapophytoene + FAD + H+all-trans-4,4'-diapophytofluene + FADH2,
all-trans-4,4'-diapophytofluene + FAD + H+all-trans-4,4'-diapo-ζ-carotene + FADH2,
all-trans-4,4'-diapo-ζ-carotene + FAD + H+all-trans-4,4'-diaponeurosporene + FADH2,
all-trans-4,4'-diaponeurosporene + FAD + H+all-trans-4,4'-diapolycopene + FADH2

Standard Gibbs Free Energy (ΔrG in kcal/mol): -77.26233Inferred by computational analysis [Latendresse13]

Enzyme Commission Summary:
The enzyme, characterized from the bacterium Methylomonas sp. 16a, is responsible for four successive dehydrogenations. Some species possess a related enzyme that proceeds only as far as all-trans-4,4'-diaponeurosporene, cf. EC 1.3.8.o, 4,4'-diapophytoene desaturase (4,4'-diaponeurosporene-forming).

Citations: [Raisig01, Wieland94 , Tao05]

Gene-Reaction Schematic

Gene-Reaction Schematic

Unification Links: KEGG:R09690, Rhea:31394

Relationship Links: BRENDA:EC:, ENZYME:EC:, IUBMB-ExplorEnz:EC:

Created 10-Mar-2011 by Caspi R, SRI International


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

Raisig01: Raisig A, Sandmann G (2001). "Functional properties of diapophytoene and related desaturases of C(30) and C(40) carotenoid biosynthetic pathways." Biochim Biophys Acta 1533(2);164-70. PMID: 11566453

Tao05: Tao L, Schenzle A, Odom JM, Cheng Q (2005). "Novel carotenoid oxidase involved in biosynthesis of 4,4'-diapolycopene dialdehyde." Appl Environ Microbiol 71(6);3294-301. PMID: 15933032

Wieland94: Wieland B, Feil C, Gloria-Maercker E, Thumm G, Lechner M, Bravo JM, Poralla K, Gotz F (1994). "Genetic and biochemical analyses of the biosynthesis of the yellow carotenoid 4,4'-diaponeurosporene of Staphylococcus aureus." J Bacteriol 176(24);7719-26. PMID: 8002598

Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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