1.3.99.39: carotenoid phi-ring synthase
This is an abbreviated version!
For detailed information about carotenoid phi-ring synthase, go to the full flat file.
Reaction
+ 2 acceptor = + 2 reduced acceptor
Synonyms
crtU, CT0323, gamma-carotene desaturase
ECTree
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Systematic Name
Systematic Name on EC 1.3.99.39 - carotenoid phi-ring synthase
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carotenoid beta-ring:acceptor oxidoreductase/methyltranferase (phi-ring forming)
The enzyme, found in green sulfur bacteria, some cyanobacteria and some actinobacteria, introduces additional double bonds to the carotenoid beta-end group, leading to aromatization of the ionone ring. As a result, one of the methyl groups at C-1 is transferred to position C-2. It is involved in the biosynthesis of carotenoids with phi-type aromatic end groups such as chlorobactene, beta-isorenieratene, and isorenieratene.