ID   CHLN_PINCO              Reviewed;         459 AA.
AC   P26180;
DT   01-MAY-1992, integrated into UniProtKB/Swiss-Prot.
DT   01-MAY-1992, sequence version 1.
DT   03-AUG-2022, entry version 82.
DE   RecName: Full=Light-independent protochlorophyllide reductase subunit N {ECO:0000255|HAMAP-Rule:MF_00352};
DE            Short=DPOR subunit N {ECO:0000255|HAMAP-Rule:MF_00352};
DE            Short=LI-POR subunit N {ECO:0000255|HAMAP-Rule:MF_00352};
DE            EC=1.3.7.7 {ECO:0000255|HAMAP-Rule:MF_00352};
GN   Name=chlN {ECO:0000255|HAMAP-Rule:MF_00352}; Synonyms=gidA;
OS   Pinus contorta (Shore pine) (Lodgepole pine).
OG   Plastid; Chloroplast.
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Pinopsida; Pinidae; Conifers I; Pinales; Pinaceae; Pinus;
OC   Pinus subgen. Pinus.
OX   NCBI_TaxID=3339;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   TISSUE=Leaf;
RX   PubMed=1912499; DOI=10.1007/bf00037061;
RA   Lidholm J., Gustafsson P.;
RT   "Homologues of the green algal gidA gene and the liverwort frxC gene are
RT   present on the chloroplast genomes of conifers.";
RL   Plant Mol. Biol. 17:787-798(1991).
CC   -!- FUNCTION: Component of the dark-operative protochlorophyllide reductase
CC       (DPOR) that uses Mg-ATP and reduced ferredoxin to reduce ring D of
CC       protochlorophyllide (Pchlide) to form chlorophyllide a (Chlide). This
CC       reaction is light-independent. The NB-protein (ChlN-ChlB) is the
CC       catalytic component of the complex. {ECO:0000255|HAMAP-Rule:MF_00352}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2 ADP + chlorophyllide a + oxidized 2[4Fe-4S]-[ferredoxin] + 2
CC         phosphate = 2 ATP + 2 H2O + protochlorophyllide a + reduced 2[4Fe-
CC         4S]-[ferredoxin]; Xref=Rhea:RHEA:28202, Rhea:RHEA-COMP:10002,
CC         Rhea:RHEA-COMP:10004, ChEBI:CHEBI:15377, ChEBI:CHEBI:30616,
CC         ChEBI:CHEBI:33722, ChEBI:CHEBI:33723, ChEBI:CHEBI:43474,
CC         ChEBI:CHEBI:83348, ChEBI:CHEBI:83350, ChEBI:CHEBI:456216; EC=1.3.7.7;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00352};
CC   -!- COFACTOR:
CC       Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00352};
CC       Note=Binds 1 [4Fe-4S] cluster per heterodimer. The cluster is bound at
CC       the heterodimer interface by residues from both subunits.
CC       {ECO:0000255|HAMAP-Rule:MF_00352};
CC   -!- PATHWAY: Porphyrin-containing compound metabolism; chlorophyll
CC       biosynthesis (light-independent). {ECO:0000255|HAMAP-Rule:MF_00352}.
CC   -!- SUBUNIT: Protochlorophyllide reductase is composed of three subunits;
CC       ChlL, ChlN and ChlB. Forms a heterotetramer of two ChlB and two ChlN
CC       subunits. {ECO:0000255|HAMAP-Rule:MF_00352}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast.
CC   -!- SIMILARITY: Belongs to the BchN/ChlN family. {ECO:0000255|HAMAP-
CC       Rule:MF_00352}.
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DR   EMBL; X56200; CAA39660.1; -; Genomic_DNA.
DR   PIR; S17742; S17742.
DR   AlphaFoldDB; P26180; -.
DR   SMR; P26180; -.
DR   UniPathway; UPA00670; -.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0016730; F:oxidoreductase activity, acting on iron-sulfur proteins as donors; IEA:InterPro.
DR   GO; GO:0016636; F:oxidoreductase activity, acting on the CH-CH group of donors, iron-sulfur protein as acceptor; IEA:UniProtKB-UniRule.
DR   GO; GO:0036068; P:light-independent chlorophyll biosynthetic process; IEA:UniProtKB-UniPathway.
DR   GO; GO:0019685; P:photosynthesis, dark reaction; IEA:InterPro.
DR   HAMAP; MF_00352; ChlN_BchN; 1.
DR   InterPro; IPR000510; Nase/OxRdtase_comp1.
DR   InterPro; IPR005970; Protochl_reductN.
DR   Pfam; PF00148; Oxidored_nitro; 1.
DR   PIRSF; PIRSF000162; P_chlorophyll_rd; 1.
DR   TIGRFAMs; TIGR01279; DPOR_bchN; 1.
PE   3: Inferred from homology;
KW   4Fe-4S; ATP-binding; Chlorophyll biosynthesis; Chloroplast; Iron;
KW   Iron-sulfur; Metal-binding; Nucleotide-binding; Oxidoreductase;
KW   Photosynthesis; Plastid.
FT   CHAIN           1..459
FT                   /note="Light-independent protochlorophyllide reductase
FT                   subunit N"
FT                   /id="PRO_0000208618"
FT   BINDING         22
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_note="ligand shared with heterodimeric partner"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00352"
FT   BINDING         47
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_note="ligand shared with heterodimeric partner"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00352"
FT   BINDING         107
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /ligand_note="ligand shared with heterodimeric partner"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00352"
SQ   SEQUENCE   459 AA;  52122 MW;  C9F28480286F81F0 CRC64;
     MSTKIVETIT LECETGNYHS FCPISCVSWL YQKIEDSFFL VVGTKTCGYF LQNALGVMIF
     AEPRYAMAEL EEGDISAHLN DYEELKTLCI RIRKDRDPSV IIWIGTCTTE IIKMDLEGMA
     PKLEYEIGVP ILVARANGLD YAFTQGEDTV LAVMAHRCPD QEFPIGESKE TKKKLFPFPL
     LKENNLVEYA NHPPLVIFGS LPSNLVSQLD TELRRQFIKV SGWLPAQRYA DLPSLGDGVY
     VCGVNPFLSR TATTLIRRKK CELIVAPFPI GPDGTRAWIE RICPVFGIEA QSLEEIEERI
     WESLKDYLDL VRGKSVFFMG DNLIEISIAR FLIRCGMIVY EIGIPYLDKR YQAAELALLK
     KTCIRMCMPI PRIVEKPDNS NQIRRMRELK PDLAITGMAH ANPLGARGIG TKWSVEFTFA
     QIHGFANARD VLELVTRPLR RNENLDNLDR TTLVRKNNK