ID 1.14.13.81 DE magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase. AN Mg-protoporphyrin IX monomethyl ester oxidative cyclase. CA 2 H(+) + Mg-protoporphyrin IX 13-monomethyl ester + 3 NADPH + 3 O2 = 3,8- CA divinyl protochlorophyllide a + 5 H2O + 3 NADP(+). CC -!- The enzyme participates in the biosynthesis of chlorophyllide a in CC aerobic organisms. CC -!- The same transformation is achieved in anaerobic organisms by CC EC 1.21.98.3. CC -!- Some facultative phototrophic bacteria, such as Rubrivivax CC gelatinosus, possess both enzymes. DR Q8YX57, ACSF1_NOSS1; P72584, ACSF1_SYNY3; Q8DJ05, ACSF1_THEVB; DR Q8YVU4, ACSF2_NOSS1; P74134, ACSF2_SYNY3; Q8DI68, ACSF2_THEVB; DR Q8YRZ2, ACSF3_NOSS1; A5EQ73, ACSF_BRASB ; A4YNQ1, ACSF_BRASO ; DR Q9TLR8, ACSF_CYACA ; Q85FX6, ACSF_CYAM1 ; Q7NFA1, ACSF_GLOVI ; DR Q6B8U1, ACSF_GRATL ; Q1XDK9, ACSF_NEOYE ; Q7U6Y8, ACSF_PARMW ; DR P51277, ACSF_PORPU ; A3PD22, ACSF_PROM0 ; A8G4Z1, ACSF_PROM2 ; DR A2CDU0, ACSF_PROM3 ; A9BAI8, ACSF_PROM4 ; A2BWG6, ACSF_PROM5 ; DR Q31AS9, ACSF_PROM9 ; Q7VBV0, ACSF_PROMA ; Q7V3Y9, ACSF_PROMM ; DR Q7V1M1, ACSF_PROMP ; A2BR98, ACSF_PROMS ; Q2ISZ6, ACSF_RHOP2 ; DR Q6N9J7, ACSF_RHOPA ; Q132P2, ACSF_RHOPS ; B3Q7D4, ACSF_RHOPT ; DR P0DJN9, ACSF_RUBGE ; I0HUK7, ACSF_RUBGI ; Q31LY2, ACSF_SYNE7 ; DR Q5MZZ2, ACSF_SYNP6 ; A5GKR3, ACSF_SYNPW ; A5GU20, ACSF_SYNR3 ; DR Q0IAL0, ACSF_SYNS3 ; Q3AK18, ACSF_SYNSC ; Q118B4, ACSF_TRIEI ; DR Q9M591, CRD1_ARATH ; Q9LD46, CRD1_CHLRE ; Q945B7, CRD1_EUPES ; DR Q6SJV8, CRD1_GOSHI ; Q5EFU4, CRD1_HORVU ; Q9AR22, CTH1_CHLRE ; //