The Enzyme Database

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EC 1.3.99.40     
Accepted name: carotenoid χ-ring synthase
Reaction: carotenoid β-end group + 2 acceptor = carotenoid χ-end group + 2 reduced acceptor
For diagram of aromatic carotenoid biosynthesis, click here
Glossary: okenone = 1′-methoxy-1′,2′-dihydro-χ,ψ-caroten-4′-one
renierapurpurin = χ,χ-carotene
synechoxanthin = χ,χ-caroten-18,18′-dioate
Other name(s): crtU (gene name) (ambiguous); cruE (gene name)
Systematic name: carotenoid β-ring:acceptor oxidoreductase/methyltranferase (χ-ring forming)
Comments: The enzyme, found in purple sulfur bacteria (Chromatiaceae) and some cyanobacteria, is involved in the biosynthesis of carotenoids that contain χ-type end groups, such as okenone, renierapurpurin, and synechoxanthin.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Graham, J.E. and Bryant, D.A. The Biosynthetic pathway for synechoxanthin, an aromatic carotenoid synthesized by the euryhaline, unicellular cyanobacterium Synechococcus sp. strain PCC 7002. J. Bacteriol. 190 (2008) 7966–7974. [DOI] [PMID: 18849428]
2.  Vogl, K. and Bryant, D.A. Biosynthesis of the biomarker okenone: χ-ring formation. Geobiology 10 (2012) 205–215. [DOI] [PMID: 22070388]
[EC 1.3.99.40 created 2018]
 
 


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