1.21.98.3: anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase
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Reaction
Synonyms
BChE, chlE, Cyan7425_4778, Cyan7822_3999, F_1025, Mg-protoporphyrin IX monomethyl ester cyclase, MPE cyclase, oxygen-independent Mg-protoporphyrin IX monomethyl ester cyclase
ECTree
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Systematic Name
Systematic Name on EC 1.21.98.3 - anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase
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magnesium-protoporphyrin-IX 13-monomethyl ester,S-adenosyl-L-methionine:H2O oxidoreductase (hydroxylating)
This radical AdoMet enzyme participates in the biosynthesis of chlorophyllide a in anaerobic bacteria, catalysing the formation of an isocyclic ring. Contains a [4Fe-4S] cluster and a cobalamin cofactor. The same transformation is achieved in aerobic organisms by the oxygen-dependent EC 1.14.13.81, magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase. Some facultative phototrophic bacteria, such as Rubrivivax gelatinosus, possess both enzymes.