anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase EC#: 1.21.98.3; ChemWhat Code: 1376095

Product Name anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase
Example Structure Example Structure of anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase EC#: 1.21.98.3
Synonyms BChE, chlE, Cyan7425_4778, Cyan7822_3999, F_1025, MPE cyclase, oxygen-independent Mg-protoporphyrin IX monomethyl ester cyclase
EC Number 1.21.98.3
CAS Registry Number
Comments 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.
Cofactor iron-sulfur;adenosylcob(III)alamin
History
Reactions Magnesium-protoporphyrin Ix 13-monomethyl ester + 3 S-adenosyl-L- methionine + H(2)O = 3,8-divinyl protochlorophyllide a + 3 5′-deoxyadenosine + 3 L-methionine.

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