ID   NUOB_SHIFL              Reviewed;         220 AA.
AC   P0AFD0; P33598; P78090; P78186; P78187;
DT   20-DEC-2005, integrated into UniProtKB/Swiss-Prot.
DT   20-DEC-2005, sequence version 1.
DT   02-SEP-2026, entry version 125.
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};
GN   OrderedLocusNames=SF2363, S2498;
OS   Shigella flexneri.
OC   Bacteria; Pseudomonadati; Pseudomonadota; Gammaproteobacteria;
OC   Enterobacterales; Enterobacteriaceae; Shigella.
OX   NCBI_TaxID=623;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=301 / Serotype 2a;
RX   PubMed=12384590; DOI=10.1093/nar/gkf566;
RA   Jin Q., Yuan Z., Xu J., Wang Y., Shen Y., Lu W., Wang J., Liu H., Yang J.,
RA   Yang F., Zhang X., Zhang J., Yang G., Wu H., Qu D., Dong J., Sun L.,
RA   Xue Y., Zhao A., Gao Y., Zhu J., Kan B., Ding K., Chen S., Cheng H.,
RA   Yao Z., He B., Chen R., Ma D., Qiang B., Wen Y., Hou Y., Yu J.;
RT   "Genome sequence of Shigella flexneri 2a: insights into pathogenicity
RT   through comparison with genomes of Escherichia coli K12 and O157.";
RL   Nucleic Acids Res. 30:4432-4441(2002).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700930 / 2457T / Serotype 2a;
RX   PubMed=12704152; DOI=10.1128/iai.71.5.2775-2786.2003;
RA   Wei J., Goldberg M.B., Burland V., Venkatesan M.M., Deng W., Fournier G.,
RA   Mayhew G.F., Plunkett G. III, Rose D.J., Darling A., Mau B., Perna N.T.,
RA   Payne S.M., Runyen-Janecky L.J., Zhou S., Schwartz D.C., Blattner F.R.;
RT   "Complete genome sequence and comparative genomics of Shigella flexneri
RT   serotype 2a strain 2457T.";
RL   Infect. Immun. 71:2775-2786(2003).
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
CC       ubiquinone. 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 + NADH + 5 H(+)(in) = a quinol + NAD(+) + 4
CC         H(+)(out); Xref=Rhea:RHEA:57888, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:24646, ChEBI:CHEBI:57540, ChEBI:CHEBI:57945,
CC         ChEBI:CHEBI:132124; 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 13 different subunits. Subunits NuoB, CD,
CC       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; AE005674; AAN43876.1; -; Genomic_DNA.
DR   EMBL; AE014073; AAP17694.1; -; Genomic_DNA.
DR   RefSeq; NP_708169.1; NC_004337.2.
DR   RefSeq; WP_000386733.1; NZ_AP040250.1.
DR   AlphaFoldDB; P0AFD0; -.
DR   SMR; P0AFD0; -.
DR   STRING; 198214.SF2363; -.
DR   PaxDb; 198214-SF2363; -.
DR   GeneID; 1027233; -.
DR   GeneID; 67176143; -.
DR   GeneID; 93774887; -.
DR   KEGG; sfl:SF2363; -.
DR   KEGG; sfx:S2498; -.
DR   PATRIC; fig|198214.7.peg.2829; -.
DR   HOGENOM; CLU_055737_7_3_6; -.
DR   Proteomes; UP000001006; Chromosome.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045271; C:respiratory chain complex I; IEA:TreeGrafter.
DR   GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:InterPro.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0050136; F:NADH dehydrogenase (quinone) (non-electrogenic) activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0008137; F:NADH dehydrogenase (ubiquinone) activity; IEA:InterPro.
DR   GO; GO:0048038; F:quinone binding; IEA:InterPro.
DR   GO; GO:0009060; P:aerobic respiration; IEA:TreeGrafter.
DR   GO; GO:0015990; P:electron transport coupled proton transport; IEA:TreeGrafter.
DR   FunFam; 3.40.50.12280:FF:000002; NADH-quinone oxidoreductase subunit B; 1.
DR   Gene3D; 3.40.50.12280; -; 1.
DR   HAMAP; MF_01356; NDH1_NuoB; 1.
DR   InterPro; IPR006137; NADH_UbQ_OxRdtase-like_20kDa.
DR   InterPro; IPR006138; NADH_UQ_OxRdtase_20Kd_su.
DR   NCBIfam; TIGR01957; nuoB_fam; 1.
DR   NCBIfam; NF005012; PRK06411.1; 1.
DR   PANTHER; PTHR11995; NADH DEHYDROGENASE; 1.
DR   PANTHER; PTHR11995:SF14; NADH DEHYDROGENASE [UBIQUINONE] IRON-SULFUR PROTEIN 7, MITOCHONDRIAL; 1.
DR   Pfam; PF01058; Oxidored_q6; 1.
DR   SUPFAM; SSF56770; HydA/Nqo6-like; 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;
KW   Ubiquinone.
FT   CHAIN           1..220
FT                   /note="NADH-quinone oxidoreductase subunit B"
FT                   /id="PRO_0000118768"
FT   BINDING         63
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         64
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         129
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
FT   BINDING         158
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01356"
SQ   SEQUENCE   220 AA;  25056 MW;  EBD6268505993880 CRC64;
     MDYTLTRIDP NGENDRYPLQ KQEIVTDPLE QEVNKNVFMG KLNDMVNWGR KNSIWPYNFG
     LSCCYVEMVT SFTAVHDVAR FGAEVLRASP RQADLMVVAG TCFTKMAPVI QRLYDQMLEP
     KWVISMGACA NSGGMYDIYS VVQGVDKFIP VDVYIPGCPP RPEAYMQALM LLQESIGKER
     RPLSWVVGDQ GVYRANMQSE RERKRGERIA VTNLRTPDEI
//