1.14.13.81	131-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADPH + H+ + O2 = 131-oxo-magnesium-protoporphyrin IX 13-monomethyl ester + NADP+ + 2 H2O	(1b)	
1.14.13.81	131-oxo-magnesium-protoporphyrin IX 13-monomethyl ester + NADPH + H+ + O2 = 3,8-divinyl protochlorophyllide a + NADP+ + 2 H2O	(1c)	
1.14.13.81	magnesium-protoporphyrin IX 13-monomethyl ester + 3 NADPH + 3 H+ + 3 O2 = 3,8-divinyl protochlorophyllide a + 3 NADP+ + 5 H2O	overall reaction	
1.14.13.81	magnesium-protoporphyrin IX 13-monomethyl ester + 3 NADPH + 3 H+ + 3 O2 = 3,8-divinyl protochlorophyllide a + 3 NADP+ + 5 H2O	mass spectrometry identified 131-hydroxy-MgPME and 131-keto-MgPME are intermediates in the formation of the isocyclic ring, revealing the reaction chemistry that converts porphyrins to chlorins. Reaction mechanism, identification of proposed reaction intermediates in the progress of the reaction by mass spectrometry, overview	
1.14.13.81	magnesium-protoporphyrin IX 13-monomethyl ester + 3 NADPH + 3 H+ + 3 O2 = 3,8-divinyl protochlorophyllide a + 3 NADP+ + 5 H2O	overall reaction, reaction mechanism of the aerobic cyclase reaction, overview. The cyclase reaction is a six-electron redox reaction suggested to proceed via beta-hydroxy and beta-keto intermediates. The electrons are provided by Fd. NADPH can be used as the source of electrons transferred to ferredoxin (Fd) via ferredoxin-NADPH oxidoreductase (FNR). In green tissue, Fd can also be reduced by photosystem I	
1.14.13.81	magnesium-protoporphyrin IX 13-monomethyl ester + NADPH + H+ + O2 = 131-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADP+ + H2O	(1a)