ExplorEnz: EC 1.14.11.70

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1.14.11.70

Accepted name:

7-deoxycylindrospermopsin hydroxylase

Reaction:

(1) 7-deoxycylindrospermopsin + 2-oxoglutarate + O₂ = cylindrospermopsin + succinate + CO₂
(2) 7-deoxycylindrospermopsin + 2-oxoglutarate + O₂ = 7-epi-cylindrospermopsin + succinate + CO₂

Glossary:

cylindrospermopsin = (2aS,3R,4S,5aS,7R)-7-[(R)-(2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)(hydroxy)methyl]-3-methyl-2a,3,4,5,5a,6,7,8-octahydro-2H-1,8,8b-triazaacenaphthylen-4-yl hydrogen sulfate

Other name(s):

cyrI (gene name)

Systematic name:

7-deoxycylindrospermopsin,2-oxoglutarate:oxygen oxidoreductase (7-hydroxylating)

Comments:

Requires iron(II). The enzyme, found in some cyanobacterial species, catalyses the last step in the biosynthesis of the toxins cylindrospermopsin and 7-epi-cylindrospermopsin. The ratio of the two products differs among different strains.

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc

References:

1.	Mazmouz, R., Chapuis-Hugon, F., Pichon V., Mejean, A., and Ploux, O. The last step of the biosynthesis of the cyanotoxins cylindrospermopsin and 7-epi-cylindrospermopsin is catalysed by CyrI, a 2-oxoglutarate-dependent iron oxygenase. ChemBioChem 12 (2011) 858–862.
2.	Mazmouz, R., Essadik, I., Hamdane, D., Mejean, A. and Ploux, O. Characterization of CyrI, the hydroxylase involved in the last step of cylindrospermopsin biosynthesis: Binding studies, site-directed mutagenesis and stereoselectivity. Arch. Biochem. Biophys. 647 (2018) 1–9. [PMID: 29653078]

[EC 1.14.11.70 created 2019]