|Superclasses:||Reactions Classified By Conversion Type → Simple Reactions → Chemical Reactions → Composite Reactions|
|Reactions Classified By Substrate → Small-Molecule Reactions|
EC Number: 18.104.22.168
Enzymes and Genes:
|Methylomonas sp. 16a:||diapophytoene desaturase: 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
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): -77.26233 [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).
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
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
©2015 SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025-3493