ID   1.14.13.81
DE   Magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase.
AN   Mg-protoporphyrin IX monomethyl ester oxidative cyclase.
CA   (1) Magnesium-protoporphyrin IX 13-monomethyl ester + NADPH + O(2) =
CA   13(1)-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADP(+) +
CA   H(2)O.
CA   (2) 13(1)-hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADPH
CA   + O(2) = 13(1)-oxo-magnesium-protoporphyrin IX 13-monomethyl ester +
CA   NADP(+) + 2 H(2)O.
CA   (3) 13(1)-oxo-magnesium-protoporphyrin IX 13-monomethyl ester + NADPH +
CA   O(2) = divinylprotochlorophyllide + NADP(+) + 2 H(2)O.
CF   Iron.
CC   -!- The cyclase activity in Chlamydomonas reinhardtii is associated
CC       exclusively with the membranes, whereas that from cucumber cotyledons
CC       requires both membrane and soluble fractions for activity.
DR   Q8YX57, ACSF1_NOSS1;  P72584, ACSF1_SYNY3;  Q8DJ05, ACSF1_THEEB;
DR   Q8YVU4, ACSF2_NOSS1;  P74134, ACSF2_SYNY3;  Q8DI68, ACSF2_THEEB;
DR   Q8YRZ2, ACSF3_NOSS1;  A5EQ73, ACSF_BRASB ;  A4YNQ1, ACSF_BRASO ;
DR   Q9TLR8, ACSF_CYACA ;  Q85FX6, ACSF_CYAME ;  Q7NFA1, ACSF_GLOVI ;
DR   Q6B8U1, ACSF_GRATL ;  P51277, ACSF_PORPU ;  Q1XDK9, ACSF_PORYE ;
DR   A3PD22, ACSF_PROM0 ;  A8G4Z1, ACSF_PROM2 ;  A2CDU0, ACSF_PROM3 ;
DR   A9BAI8, ACSF_PROM4 ;  A2BWG6, ACSF_PROM5 ;  Q31AS9, ACSF_PROM9 ;
DR   Q7VBV0, ACSF_PROMA ;  Q7V3Y9, ACSF_PROMM ;  Q7V1M1, ACSF_PROMP ;
DR   A2BR98, ACSF_PROMS ;  Q2ISZ6, ACSF_RHOP2 ;  Q6N9J7, ACSF_RHOPA ;
DR   Q132P2, ACSF_RHOPS ;  B3Q7D4, ACSF_RHOPT ;  Q8VPB5, ACSF_RUBGE ;
DR   Q31LY2, ACSF_SYNE7 ;  Q5MZZ2, ACSF_SYNP6 ;  A5GKR3, ACSF_SYNPW ;
DR   Q7U6Y8, ACSF_SYNPX ;  A5GU20, ACSF_SYNR3 ;  Q0IAL0, ACSF_SYNS3 ;
DR   Q3AK18, ACSF_SYNSC ;  Q118B4, ACSF_TRIEI ;  Q9M591, CRD1_ARATH ;
DR   Q9LD46, CRD1_CHLRE ;  Q945B7, CRD1_EUPES ;  Q6SJV8, CRD1_GOSHI ;
DR   Q5EFU4, CRD1_HORVU ;  Q9AR22, CTH1_CHLRE ;
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