ID   NDHK_PAUCH              Reviewed;         246 AA.
AC   B1X4R2;
DT   16-DEC-2008, integrated into UniProtKB/Swiss-Prot.
DT   20-MAY-2008, sequence version 1.
DT   03-AUG-2022, entry version 53.
DE   RecName: Full=NAD(P)H-quinone oxidoreductase subunit K, organellar chromatophore {ECO:0000255|HAMAP-Rule:MF_01356};
DE            EC=7.1.1.- {ECO:0000255|HAMAP-Rule:MF_01356};
DE   AltName: Full=NAD(P)H dehydrogenase subunit K {ECO:0000255|HAMAP-Rule:MF_01356};
DE   AltName: Full=NADH-plastoquinone oxidoreductase subunit K {ECO:0000255|HAMAP-Rule:MF_01356};
GN   Name=ndhK {ECO:0000255|HAMAP-Rule:MF_01356}; Synonyms=nuoB;
GN   OrderedLocusNames=PCC_0495;
OS   Paulinella chromatophora.
OG   Plastid; Organellar chromatophore.
OC   Eukaryota; Sar; Rhizaria; Imbricatea; Silicofilosea; Euglyphida;
OC   Paulinellidae; Paulinella.
OX   NCBI_TaxID=39717;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=18356055; DOI=10.1016/j.cub.2008.02.051;
RA   Nowack E.C.M., Melkonian M., Gloeckner G.;
RT   "Chromatophore genome sequence of Paulinella sheds light on acquisition of
RT   photosynthesis by eukaryotes.";
RL   Curr. Biol. 18:410-418(2008).
CC   -!- FUNCTION: NDH-1 shuttles electrons from NADH, via FMN and iron-sulfur
CC       (Fe-S) centers, to quinones in the respiratory chain. Couples the redox
CC       reaction to proton translocation (for every two electrons transferred,
CC       four hydrogen ions are translocated across the cytoplasmic membrane),
CC       and thus conserves the redox energy in a proton gradient (By
CC       similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a quinone + H(+) + NADH = a quinol + NAD(+);
CC         Xref=Rhea:RHEA:46160, ChEBI:CHEBI:15378, ChEBI:CHEBI:24646,
CC         ChEBI:CHEBI:57540, ChEBI:CHEBI:57945, ChEBI:CHEBI:132124;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01356};
CC   -!- COFACTOR:
CC       Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01356};
CC       Note=Binds 1 [4Fe-4S] cluster. {ECO:0000255|HAMAP-Rule:MF_01356};
CC   -!- SUBUNIT: NDH-1 is composed of 14 different subunits. Subunits nuoB, C,
CC       D, E, F, and G constitute the peripheral sector of the complex (By
CC       similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Plastid, organellar chromatophore thylakoid
CC       membrane {ECO:0000250}; Peripheral membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01356}; Stromal side {ECO:0000255|HAMAP-Rule:MF_01356}.
CC   -!- SIMILARITY: Belongs to the complex I 20 kDa subunit family.
CC       {ECO:0000255|HAMAP-Rule:MF_01356}.
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DR   EMBL; CP000815; ACB42931.1; -; Genomic_DNA.
DR   RefSeq; YP_002049141.1; NC_011087.1.
DR   AlphaFoldDB; B1X4R2; -.
DR   SMR; B1X4R2; -.
DR   GeneID; 6481479; -.
DR   GO; GO:0070118; C:organellar chromatophore thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-UniRule.
DR   GO; GO:0009536; C:plastid; IEA:UniProtKB-KW.
DR   GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-KW.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0008137; F:NADH dehydrogenase (ubiquinone) activity; IEA:InterPro.
DR   GO; GO:0048038; F:quinone binding; IEA:UniProtKB-KW.
DR   HAMAP; MF_01356; NDH1_NuoB; 1.
DR   InterPro; IPR006137; NADH_UbQ_OxRdtase-like_20kDa.
DR   InterPro; IPR006138; NADH_UQ_OxRdtase_20Kd_su.
DR   Pfam; PF01058; Oxidored_q6; 1.
DR   TIGRFAMs; TIGR01957; nuoB_fam; 1.
DR   PROSITE; PS01150; COMPLEX1_20K; 1.
PE   3: Inferred from homology;
KW   4Fe-4S; Iron; Iron-sulfur; Membrane; Metal-binding; NAD;
KW   Organellar chromatophore; Plastid; Quinone; Thylakoid; Translocase;
KW   Transport; Ubiquinone.
FT   CHAIN           1..246
FT                   /note="NAD(P)H-quinone oxidoreductase subunit K, organellar
FT                   chromatophore"
FT                   /id="PRO_0000358588"
FT   BINDING         58
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         59
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         123
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         154
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
SQ   SEQUENCE   246 AA;  26998 MW;  5ACF972D9247FFE7 CRC64;
     MTPSIDALRD FRASTCNLVG TPTVTNDLSE NIILTSLDDL HNWARLSSLW PLLYGTACCF
     IEFAALIGSR FDFDRFGLVP RSSPRQADLI IVAGTVTMKM APALVRLYEQ MPEPKYVIAM
     GACTITGGMF SSDSTTAVRG VDKLIPVDLY LPGCPPRPEA IFDAVIKLRK KVGNEALRER
     GKLLPTHRYF TVAHKMKQVK PIITGTYLRA KTQQNALQAG VALPVDFKAE ALPTKVILSN
     SLSLDN