KEGG Orthology (KO) [BR:ko00001]
09100 Metabolism
09108 Metabolism of cofactors and vitamins
00860 Porphyrin metabolism
K04035 E1.14.13.81, acsF, chlE; magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase
Enzymes [BR:ko01000]
1. Oxidoreductases
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
1.14.13 With NADH or NADPH as one donor, and incorporation of one atom of oxygen into the other donor
1.14.13.81 magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase
K04035 E1.14.13.81, acsF, chlE; magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase
magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase;
Mg-protoporphyrin IX monomethyl ester (oxidative) cyclase
Class
Oxidoreductases;
Acting on paired donors, with incorporation or reduction of molecular oxygen;
With NADH or NADPH as one donor, and incorporation of one atom of oxygen into the other donor
magnesium-protoporphyrin IX 13-monomethyl ester [CPD:C04536];
NADPH [CPD:C00005];
H+ [CPD:C00080];
O2 [CPD:C00007];
131-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester;
131-oxo-magnesium-protoporphyrin IX 13-monomethyl ester
Product
3,8-divinyl protochlorophyllide a [CPD:C11831];
NADP+ [CPD:C00006];
H2O [CPD:C00001];
131-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester;
131-oxo-magnesium-protoporphyrin IX 13-monomethyl ester
Comment
Requires iron(II) for activity. The enzyme participates in the biosynthesis of chlorophyllide a in aerobic organisms. The same transformation is achieved in anaerobic organisms by EC 1.21.98.3, anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase. Some facultative phototrophic bacteria, such as Rubrivivax gelatinosus, possess both enzymes.
The Chlorophyll Biosynthetic Enzyme Mg-Protoporphyrin IX Monomethyl Ester (Oxidative) Cyclase (Characterization and Partial Purification from Chlamydomonas reinhardtii and Synechocystis sp. PCC 6803).
Rubrivivax gelatinosus acsF (previously orf358) codes for a conserved, putative binuclear-iron-cluster-containing protein involved in aerobic oxidative cyclization of Mg-protoporphyrin IX monomethylester.
Enzymatic reactions [BR:br08201]
1. Oxidoreductase reactions
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
1.14.13 With NADH or NADPH as one donor, and incorporation of one atom of oxygen into the other donor
1.14.13.81
R06265 Magnesium protoporphyrin monomethyl ester + NADPH + H+ + Oxygen <=> 13(1)-Hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADP+ + H2O