Product Name
spheroidene monooxygenase
Example Structure
Synonyms
acyclic carotenoid 2-ketolase, CrtA
EC Number
1.14.15.9
CAS Registry Number
Comments
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].
Cofactor
heme
History
Reactions
(1) Spheroidene + 2 reduced ferredoxin [iron-sulfur] cluster + 2 O(2) = spheroiden-2-one + 2 oxidized ferredoxin [iron-sulfur] cluster + 3 H(2)O. (2) Spirilloxanthin + 2 reduced ferredoxin [iron-sulfur] cluster + 2 O(2) = 2-oxospirilloxanthin + 2 oxidized ferredoxin [iron-sulfur] cluster + 3 H(2)O. (3) 2-oxospirilloxanthin + 2 reduced ferredoxin [iron-sulfur] cluster + 2 O(2) = 2,2′-dioxospirilloxanthin + 2 oxidized ferredoxin [iron-sulfur] cluster + 3 H(2)O.
