ID   ACSF_PROM3              Reviewed;         349 AA.
AC   A2CDU0;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   20-FEB-2007, sequence version 1.
DT   10-JUN-2026, entry version 88.
DE   RecName: Full=Magnesium-protoporphyrin IX monomethyl ester [oxidative] cyclase {ECO:0000255|HAMAP-Rule:MF_01840};
DE            Short=Mg-protoporphyrin IX monomethyl ester oxidative cyclase {ECO:0000255|HAMAP-Rule:MF_01840};
DE            EC=1.14.13.81 {ECO:0000255|HAMAP-Rule:MF_01840};
GN   Name=acsF {ECO:0000255|HAMAP-Rule:MF_01840};
GN   OrderedLocusNames=P9303_29201;
OS   Prochlorococcus marinus (strain MIT 9303).
OC   Bacteria; Bacillati; Cyanobacteriota; Cyanophyceae; Synechococcales;
OC   Prochlorococcaceae; Prochlorococcus.
OX   NCBI_TaxID=59922;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9303;
RX   PubMed=18159947; DOI=10.1371/journal.pgen.0030231;
RA   Kettler G.C., Martiny A.C., Huang K., Zucker J., Coleman M.L., Rodrigue S.,
RA   Chen F., Lapidus A., Ferriera S., Johnson J., Steglich C., Church G.M.,
RA   Richardson P., Chisholm S.W.;
RT   "Patterns and implications of gene gain and loss in the evolution of
RT   Prochlorococcus.";
RL   PLoS Genet. 3:2515-2528(2007).
CC   -!- FUNCTION: Catalyzes the formation of the isocyclic ring in chlorophyll
CC       biosynthesis. Mediates the cyclase reaction, which results in the
CC       formation of divinylprotochlorophyllide (Pchlide) characteristic of all
CC       chlorophylls from magnesium-protoporphyrin IX 13-monomethyl ester
CC       (MgPMME). {ECO:0000255|HAMAP-Rule:MF_01840}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Mg-protoporphyrin IX 13-monomethyl ester + 3 NADPH + 3 O2 + 2
CC         H(+) = 3,8-divinyl protochlorophyllide a + 3 NADP(+) + 5 H2O;
CC         Xref=Rhea:RHEA:33235, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:15379, ChEBI:CHEBI:57783, ChEBI:CHEBI:58349,
CC         ChEBI:CHEBI:58632, ChEBI:CHEBI:60491; EC=1.14.13.81;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01840};
CC   -!- COFACTOR:
CC       Name=Fe cation; Xref=ChEBI:CHEBI:24875; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01840};
CC   -!- PATHWAY: Porphyrin-containing compound metabolism; chlorophyll
CC       biosynthesis (light-independent). {ECO:0000255|HAMAP-Rule:MF_01840}.
CC   -!- SIMILARITY: Belongs to the AcsF family. {ECO:0000255|HAMAP-
CC       Rule:MF_01840}.
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DR   EMBL; CP000554; ABM79650.1; -; Genomic_DNA.
DR   RefSeq; WP_011827489.1; NC_008820.1.
DR   AlphaFoldDB; A2CDU0; -.
DR   SMR; A2CDU0; -.
DR   STRING; 59922.P9303_29201; -.
DR   KEGG; pmf:P9303_29201; -.
DR   HOGENOM; CLU_048037_0_0_3; -.
DR   BioCyc; PMAR59922:G1G80-2562-MONOMER; -.
DR   UniPathway; UPA00670; -.
DR   Proteomes; UP000002274; Chromosome.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0048529; F:magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0036068; P:light-independent chlorophyll biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_01840; AcsF; 1.
DR   InterPro; IPR008434; AcsF.
DR   InterPro; IPR009078; Ferritin-like_SF.
DR   InterPro; IPR003251; Rr_diiron-bd_dom.
DR   NCBIfam; TIGR02029; AcsF; 1.
DR   NCBIfam; NF010172; PRK13654.1; 1.
DR   PANTHER; PTHR31053; MAGNESIUM-PROTOPORPHYRIN IX MONOMETHYL ESTER [OXIDATIVE] CYCLASE, CHLOROPLASTIC; 1.
DR   PANTHER; PTHR31053:SF2; MAGNESIUM-PROTOPORPHYRIN IX MONOMETHYL ESTER [OXIDATIVE] CYCLASE, CHLOROPLASTIC; 1.
DR   Pfam; PF02915; Rubrerythrin; 1.
DR   SUPFAM; SSF47240; Ferritin-like; 1.
PE   3: Inferred from homology;
KW   Chlorophyll biosynthesis; Iron; Metal-binding; NADP; Oxidoreductase;
KW   Photosynthesis; Reference proteome.
FT   CHAIN           1..349
FT                   /note="Magnesium-protoporphyrin IX monomethyl ester
FT                   [oxidative] cyclase"
FT                   /id="PRO_1000188411"
FT   REGION          1..23
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1..10
FT                   /note="Low complexity"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   349 AA;  40426 MW;  E5D3215D70CFE379 CRC64;
     MTATTATAPA MRGGGRNELP PHLDDNLLTP RFYTTEFDKA AKTDLDIARK DFEAMFKEME
     ADYNLKHFDR KASLERLADL SPEDKAIYES YLVRSVVSEF SGFLLFKEIS NRFKKAGRQE
     LGQFFTFLAR DEARHAGFLG RALKAEGINV DLPNLGNKRA PTFFPLSWVL YSLYLSEKIG
     YWRYILINRH LNDNPEKVCA PLFDFFEPWC QDENRHGDCI NLMMRCWPGM TKGFRGKLLS
     RFFLWSVFLT HTLTVCERGD FYGLLGIDPV LFDEEVIVQT NNTSRNAFPW VYNFDDGKFL
     EMRMQILKAF RNWRESSGLA KPVALSKFVS LILRQFALPM QKTNAVRYG
//