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EC 1.14.15.9 Details
show Brenda entryEC number
1.14.15.9
Accepted name
spheroidene monooxygenase
Reaction
(1) spheroidene + 4 reduced ferredoxin [iron-sulfur] cluster + 2 O2 + 4 H+ = spheroiden-2-one + 4 oxidized ferredoxin [iron-sulfur] cluster + 3 H2O (overall reaction);;(1a) spheroidene + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = 2-hydroxyspheroidene + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O;;(1b) 2-hydroxyspheroidene + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = 2,2-dihydroxyspheroidene + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O;;(1c) 2,2-dihydroxyspheroidene = spheroiden-2-one + H2O (spontaneous);;(2) spirilloxanthin + 4 reduced ferredoxin [iron-sulfur] cluster + 2 O2 + 4 H+ = 2-oxospirilloxanthin + 4 oxidized ferredoxin [iron-sulfur] cluster + 3 H2O (overall reaction);;(2a) spirilloxanthin + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = 2-hydroxyspirilloxanthin + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O;;(2b) 2-hydroxyspirilloxanthin + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = 2,2-dihydroxyspirilloxanthin + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O;;(2c) 2,2-dihydroxyspirilloxanthin = 2-oxospirilloxanthin + H2O (spontaneous);;
(3) 2-oxospirilloxanthin + 4 reduced ferredoxin [iron-sulfur] cluster + 2 O2 + 4 H+ = 2,2′-dioxospirilloxanthin + 4 oxidized ferredoxin [iron-sulfur] cluster + 3 H2O (overall reaction);;(3a) 2-oxospirilloxanthin + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = 2′-hydroxy-2-oxospirilloxanthin + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O;;(3b) 2′-hydroxy-2-oxospirilloxanthin + reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = 2′,2′-dihydroxy-2-oxospirilloxanthin + oxidized ferredoxin [iron-sulfur] cluster + H2O;;(3c) 2′,2′-dihydroxy-2-oxospirilloxanthin = 2,2′-dioxospirilloxanthin + H2O (spontaneous);;
Other name(s)
CrtA,
acyclic carotenoid 2-ketolase,
spirilloxanthin monooxygenase,
2-oxo-spirilloxanthin monooxygenase
Systematic name
spheroidene,reduced-ferredoxin:oxygen oxidoreductase (spheroiden-2-one-forming)
Comment
The enzyme is involved in spheroidenone biosynthesis and in 2,2′-dioxospirilloxanthin biosynthesis. The enzyme from Rhodobacter sphaeroides contains heme at its active site [1].
History
created 2012, modified 2016
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.14.15.1 camphor 5-monooxygenase
