ID   1.3.99.27
DE   1-hydroxycarotenoid 3,4-desaturase.
AN   1-hydroxycarotenoid 3,4-dehydrogenase.
AN   carotenoid 3,4-dehydrogenase.
AN   hydroxyneurosporene desaturase.
CA   A + rhodopin = (3E)-3,4-didehydrorhodopin + AH2.
CC   -!- The enzymes from Rubrivivax gelatinosus and Rhodobacter sphaeroides
CC       prefer the acyclic carotenoids (e.g. 1-hydroxy-1,2-
CC       dihydroneurosporene, 1-hydroxy-1,2-dihydrolycopene) as substrates.
CC   -!- The conversion rate for the 3,4-desaturation of the monocyclic
CC       1'-hydroxy-1',2'-dihydro-gamma-carotene is lower.
CC   -!- The enzyme from the marine bacterium strain P99-3 shows high activity
CC       with the monocyclic carotenoid 1'-hydroxy-1',2'-dihydro-gamma-
CC       carotene.
CC   -!- The enzyme from Rhodobacter sphaeroides utilizes molecular oxygen as
CC       the electron acceptor in vitro.
CC   -!- However, oxygen is unlikely to be the natural electron acceptor under
CC       anaerobic conditions.
DR   Q7WT72, CRTDH_FLAS9;  L7WC64, CRTDH_NONDD;  Q01671, CRTD_CERS4 ;
DR   P17059, CRTD_RHOCB ;  Q9JPB5, CRTD_RUBGE ;
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