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Information on EC - 1-hydroxycarotenoid 3,4-desaturase

for references in articles please use BRENDA:EC1.3.99.27
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IUBMB Comments
The enzymes from Rubrivivax gelatinosus and Rhodobacter sphaeroides prefer the acyclic carotenoids (e.g. 1-hydroxy-1,2-dihydroneurosporene, 1-hydroxy-1,2-dihydrolycopene) as substrates. The conversion rate for the 3,4-desaturation of the monocyclic 1'-hydroxy-1',2'-dihydro-gamma-carotene is lower [2,3]. The enzyme from the marine bacterium strain P99-3 shows high activity with the monocyclic carotenoid 1'-hydroxy-1',2'-dihydro-gamma-carotene . The enzyme from Rhodobacter sphaeroides utilizes molecular oxygen as the electron acceptor in vitro . However, oxygen is unlikely to be the natural electron acceptor under anaerobic conditions.
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The enzyme appears in viruses and cellular organisms
hydroxyneurosporene desaturase, p99-3 crtd, more
1-hydroxy-1,2-dihydrolycopene + acceptor = 1-hydroxy-3,4-didehydro-1,2-dihydrolycopene + reduced acceptor
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