ExplorEnz: EC 1.3.99.40

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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]