Reaction catalyzed by anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase (1.21.98.3)
+
3
+
H2O
=
+
3
+
3
magnesium-protoporphyrin IX 13-monomethyl ester
+
3 S-adenosyl-L-methionine
+
H2O
=
3,8-divinyl protochlorophyllide a
+
3 5'-deoxyadenosine
+
3 L-methionine
