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EC 1.3.99.39 Details
show Brenda entryEC number
1.3.99.39
Accepted name
carotenoid φ-ring synthase
Reaction
carotenoid β-end group + 2 acceptor = carotenoid φ-end group + 2 reduced acceptor
Other name(s)
crtU (gene name) (ambiguous)
Systematic name
carotenoid β-ring:acceptor oxidoreductase/methyltranferase (φ-ring-forming)
Comment
The enzyme, found in green sulfur bacteria, some cyanobacteria and some actinobacteria, introduces additional double bonds to the carotenoid β-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 φ-type aromatic end groups such as chlorobactene, β-isorenieratene, and isorenieratene.
History
created 2018
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.6.7.1 created 1972, deleted 1978 1.6.7.2 created 1972, deleted 1978 1.6.7.3 created 1978, deleted 1978
