ID   ACSF3_NOSS1             Reviewed;         358 AA.
AC   Q8YRZ2;
DT   16-AUG-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 1.
DT   25-MAY-2022, entry version 103.
DE   RecName: Full=Magnesium-protoporphyrin IX monomethyl ester [oxidative] cyclase 3 {ECO:0000255|HAMAP-Rule:MF_01840};
DE            Short=Mg-protoporphyrin IX monomethyl ester oxidative cyclase 3 {ECO:0000255|HAMAP-Rule:MF_01840};
DE            EC=1.14.13.81 {ECO:0000255|HAMAP-Rule:MF_01840};
GN   Name=acsF3 {ECO:0000255|HAMAP-Rule:MF_01840}; OrderedLocusNames=alr3300;
OS   Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=103690;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=11759840; DOI=10.1093/dnares/8.5.205;
RA   Kaneko T., Nakamura Y., Wolk C.P., Kuritz T., Sasamoto S., Watanabe A.,
RA   Iriguchi M., Ishikawa A., Kawashima K., Kimura T., Kishida Y., Kohara M.,
RA   Matsumoto M., Matsuno A., Muraki A., Nakazaki N., Shimpo S., Sugimoto M.,
RA   Takazawa M., Yamada M., Yasuda M., Tabata S.;
RT   "Complete genomic sequence of the filamentous nitrogen-fixing
RT   cyanobacterium Anabaena sp. strain PCC 7120.";
RL   DNA Res. 8:205-213(2001).
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=2 H(+) + Mg-protoporphyrin IX 13-monomethyl ester + 3 NADPH +
CC         3 O2 = 3,8-divinyl protochlorophyllide a + 5 H2O + 3 NADP(+);
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;
CC         Evidence={ECO:0000255|HAMAP-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; BA000019; BAB74999.1; -; Genomic_DNA.
DR   PIR; AE2218; AE2218.
DR   RefSeq; WP_010997451.1; NZ_RSCN01000001.1.
DR   AlphaFoldDB; Q8YRZ2; -.
DR   STRING; 103690.17132395; -.
DR   EnsemblBacteria; BAB74999; BAB74999; BAB74999.
DR   KEGG; ana:alr3300; -.
DR   eggNOG; COG1633; Bacteria.
DR   OMA; FHPIFKW; -.
DR   OrthoDB; 366541at2; -.
DR   UniPathway; UPA00670; -.
DR   Proteomes; UP000002483; 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-UniPathway.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   CDD; cd01047; ACSF; 1.
DR   HAMAP; MF_01840; AcsF; 1.
DR   InterPro; IPR008434; AcsF.
DR   InterPro; IPR009078; Ferritin-like_SF.
DR   InterPro; IPR003251; Rubrerythrin.
DR   PANTHER; PTHR31053; PTHR31053; 1.
DR   Pfam; PF02915; Rubrerythrin; 1.
DR   SUPFAM; SSF47240; SSF47240; 1.
DR   TIGRFAMs; TIGR02029; AcsF; 1.
PE   3: Inferred from homology;
KW   Chlorophyll biosynthesis; Iron; Metal-binding; NADP; Oxidoreductase;
KW   Photosynthesis; Reference proteome.
FT   CHAIN           1..358
FT                   /note="Magnesium-protoporphyrin IX monomethyl ester
FT                   [oxidative] cyclase 3"
FT                   /id="PRO_0000217528"
SQ   SEQUENCE   358 AA;  42298 MW;  126C5F1C4C4984F7 CRC64;
     MVDSLKKPGF EEIRPGVKVP AKETLLTPRF YTTDFDEMAR MDISVNEDEL LAILEEFRTD
     YNRHHFVRDA EFEKSWDHID GDTRRLFVEF LERSCTAEFS GFLLYKELGR RLKDKSPVLA
     ECFNLMSRDE ARHAGFLNKA MSDFNLSLDL GFLTKSRNYT FFKPKFIFYA TYLSEKIGYW
     RYITIYRHLE AHPEDRIYPI FRFFENWCQD ENRHGDFFDA IMKSQPQMLN DWKAKLWSRF
     FLLSVFATMY LNDIQRKDFY ATIGLDARDY DIYVIKKTNE TAGRVFPIIL DVDSPEFYER
     LDICVENSEK LSAIASSNTP KFLQFFQKLP VLASTGWQLL RLYLMKPIDA VSAQGAAR