ID   NUOB_FLAPJ              Reviewed;         181 AA.
AC   A6H1R3;
DT   26-MAY-2009, integrated into UniProtKB/Swiss-Prot.
DT   24-JUL-2007, sequence version 1.
DT   03-AUG-2022, entry version 90.
DE   RecName: Full=NADH-quinone oxidoreductase subunit B {ECO:0000255|HAMAP-Rule:MF_01356};
DE            EC=7.1.1.- {ECO:0000255|HAMAP-Rule:MF_01356};
DE   AltName: Full=NADH dehydrogenase I subunit B {ECO:0000255|HAMAP-Rule:MF_01356};
DE   AltName: Full=NDH-1 subunit B {ECO:0000255|HAMAP-Rule:MF_01356};
GN   Name=nuoB {ECO:0000255|HAMAP-Rule:MF_01356}; OrderedLocusNames=FP2231;
OS   Flavobacterium psychrophilum (strain ATCC 49511 / DSM 21280 / CIP 103535 /
OS   JIP02/86).
OC   Bacteria; Bacteroidetes; Flavobacteriia; Flavobacteriales;
OC   Flavobacteriaceae; Flavobacterium.
OX   NCBI_TaxID=402612;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 49511 / DSM 21280 / CIP 103535 / JIP02/86;
RX   PubMed=17592475; DOI=10.1038/nbt1313;
RA   Duchaud E., Boussaha M., Loux V., Bernardet J.-F., Michel C., Kerouault B.,
RA   Mondot S., Nicolas P., Bossy R., Caron C., Bessieres P., Gibrat J.-F.,
RA   Claverol S., Dumetz F., Le Henaff M., Benmansour A.;
RT   "Complete genome sequence of the fish pathogen Flavobacterium
RT   psychrophilum.";
RL   Nat. Biotechnol. 25:763-769(2007).
CC   -!- FUNCTION: NDH-1 shuttles electrons from NADH, via FMN and iron-sulfur
CC       (Fe-S) centers, to quinones in the respiratory chain. The immediate
CC       electron acceptor for the enzyme in this species is believed to be a
CC       menaquinone. Couples the redox reaction to proton translocation (for
CC       every two electrons transferred, four hydrogen ions are translocated
CC       across the cytoplasmic membrane), and thus conserves the redox energy
CC       in a proton gradient. {ECO:0000255|HAMAP-Rule:MF_01356}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a quinone + 5 H(+)(in) + NADH = a quinol + 4 H(+)(out) +
CC         NAD(+); Xref=Rhea:RHEA:57888, 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.
CC       {ECO:0000255|HAMAP-Rule:MF_01356}.
CC   -!- SUBCELLULAR LOCATION: Cell inner membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01356}; Peripheral membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01356}; Cytoplasmic 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; AM398681; CAL44287.1; -; Genomic_DNA.
DR   RefSeq; WP_011964321.1; NC_009613.3.
DR   RefSeq; YP_001297088.1; NC_009613.3.
DR   AlphaFoldDB; A6H1R3; -.
DR   SMR; A6H1R3; -.
DR   STRING; 402612.FP2231; -.
DR   EnsemblBacteria; CAL44287; CAL44287; FP2231.
DR   GeneID; 66553335; -.
DR   KEGG; fps:FP2231; -.
DR   PATRIC; fig|402612.5.peg.2281; -.
DR   eggNOG; COG0377; Bacteria.
DR   HOGENOM; CLU_055737_7_3_10; -.
DR   OMA; AGWVRKS; -.
DR   Proteomes; UP000006394; Chromosome.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
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; Cell inner membrane; Cell membrane; Iron; Iron-sulfur; Membrane;
KW   Metal-binding; NAD; Quinone; Reference proteome; Translocase; Transport.
FT   CHAIN           1..181
FT                   /note="NADH-quinone oxidoreductase subunit B"
FT                   /id="PRO_0000376225"
FT   BINDING         45
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         46
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         111
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         140
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
SQ   SEQUENCE   181 AA;  19905 MW;  C2CEFB2DDD6F56F2 CRC64;
     MSSNINIVEA PEGVTGEGFF ATKLNDVVGL ARANSMWPLP FATSCCGIEF MATMASHYDL
     ARFGSERVSF SPRQADMLMV MGTISKKMAP ILRQVYEQMA EPRWVIAVGA CASSGGIFDT
     YSVLQGIDKV IPVDVYVPGC PPRPEQIVDG VMRLQELVKS ESVRRRSSPE YQELLASYNI
     K