ID   1.21.98.3
DE   anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase.
AN   MPE cyclase.
CA   H2O + Mg-protoporphyrin IX 13-monomethyl ester + 3 S-adenosyl-L-
CA   methionine = 3,8-divinyl protochlorophyllide a + 3 5'-deoxyadenosine +
CA   4 H(+) + 3 L-methionine.
CC   -!- This radical AdoMet enzyme participates in the biosynthesis of
CC       chlorophyllide a in anaerobic bacteria, catalyzing the formation of
CC       an isocyclic ring.
CC   -!- The same transformation is achieved in aerobic organisms by the
CC       oxygen-dependent EC 1.14.13.81.
CC   -!- Some facultative phototrophic bacteria, such as Rubrivivax
CC       gelatinosus, possess both enzymes.
DR   Q9RFD3, BCHE_CERS4 ;  P26168, BCHE_RHOCB ;  Q7X2C7, BCHE_RUBGE ;
DR   Q55373, BCHE_SYNY3 ;
//