4,4'-Diapophytoene desaturase (, dehydrosqualene desaturase, CrtN, 4,4'-diapophytoene:FAD oxidoreductase) is an enzyme with systematic name '. This enzyme catalyses the following chemical reaction
15-cis-4,4'-diapophytoene + 4 FAD all-trans-4,4'-diapolycopene + 4 FADH2 (overall reaction)
(1a) 15-cis-4,4'-diapophytoene + FAD all-trans-4,4'-diapophytofluene + FADH2
(1b) all-trans-4,4'-diapophytofluene + FAD all-trans-4,4'-diapo-zeta-carotene + FADH2
(1c) all-trans-4,4'-diapo-zeta-carotene + FAD all-trans-4,4'-diaponeurosporene + FADH2
(1d) all-trans-4,4'-diaponeurosporene + FAD all-trans-4,4'-diapolycopene + FADH2
This enzyme is typical of Staphylococcus aureus and some other bacteria such as Heliobacillus sp.
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