NQRB_HAEDU
ID NQRB_HAEDU Reviewed; 410 AA.
AC Q7VNU8;
DT 19-JUL-2005, integrated into UniProtKB/Swiss-Prot.
DT 01-OCT-2003, sequence version 1.
DT 25-MAY-2022, entry version 97.
DE RecName: Full=Na(+)-translocating NADH-quinone reductase subunit B {ECO:0000255|HAMAP-Rule:MF_00426};
DE Short=Na(+)-NQR subunit B {ECO:0000255|HAMAP-Rule:MF_00426};
DE Short=Na(+)-translocating NQR subunit B {ECO:0000255|HAMAP-Rule:MF_00426};
DE EC=7.2.1.1 {ECO:0000255|HAMAP-Rule:MF_00426};
DE AltName: Full=NQR complex subunit B {ECO:0000255|HAMAP-Rule:MF_00426};
DE AltName: Full=NQR-1 subunit B {ECO:0000255|HAMAP-Rule:MF_00426};
GN Name=nqrB {ECO:0000255|HAMAP-Rule:MF_00426}; OrderedLocusNames=HD_0380;
OS Haemophilus ducreyi (strain 35000HP / ATCC 700724).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Pasteurellales;
OC Pasteurellaceae; Haemophilus.
OX NCBI_TaxID=233412;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=35000HP / ATCC 700724;
RA Munson R.S. Jr., Ray W.C., Mahairas G., Sabo P., Mungur R., Johnson L.,
RA Nguyen D., Wang J., Forst C., Hood L.;
RT "The complete genome sequence of Haemophilus ducreyi.";
RL Submitted (JUN-2003) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: NQR complex catalyzes the reduction of ubiquinone-1 to
CC ubiquinol by two successive reactions, coupled with the transport of
CC Na(+) ions from the cytoplasm to the periplasm. NqrA to NqrE are
CC probably involved in the second step, the conversion of ubisemiquinone
CC to ubiquinol. {ECO:0000255|HAMAP-Rule:MF_00426}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=a ubiquinone + H(+) + n Na(+)(in) + NADH = a ubiquinol + n
CC Na(+)(out) + NAD(+); Xref=Rhea:RHEA:47748, Rhea:RHEA-COMP:9565,
CC Rhea:RHEA-COMP:9566, ChEBI:CHEBI:15378, ChEBI:CHEBI:16389,
CC ChEBI:CHEBI:17976, ChEBI:CHEBI:29101, ChEBI:CHEBI:57540,
CC ChEBI:CHEBI:57945; EC=7.2.1.1; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_00426};
CC -!- COFACTOR:
CC Name=FMN; Xref=ChEBI:CHEBI:58210;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00426};
CC -!- SUBUNIT: Composed of six subunits; NqrA, NqrB, NqrC, NqrD, NqrE and
CC NqrF. {ECO:0000255|HAMAP-Rule:MF_00426}.
CC -!- SUBCELLULAR LOCATION: Cell inner membrane {ECO:0000255|HAMAP-
CC Rule:MF_00426}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC Rule:MF_00426}.
CC -!- SIMILARITY: Belongs to the NqrB/RnfD family. {ECO:0000255|HAMAP-
CC Rule:MF_00426}.
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DR EMBL; AE017143; AAP95350.1; -; Genomic_DNA.
DR RefSeq; WP_010944403.1; NC_002940.2.
DR AlphaFoldDB; Q7VNU8; -.
DR SMR; Q7VNU8; -.
DR STRING; 233412.HD_0380; -.
DR EnsemblBacteria; AAP95350; AAP95350; HD_0380.
DR KEGG; hdu:HD_0380; -.
DR eggNOG; COG1805; Bacteria.
DR HOGENOM; CLU_042020_1_1_6; -.
DR OMA; FNPAYPE; -.
DR Proteomes; UP000001022; Chromosome.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0010181; F:FMN binding; IEA:InterPro.
DR GO; GO:0016655; F:oxidoreductase activity, acting on NAD(P)H, quinone or similar compound as acceptor; IEA:UniProtKB-UniRule.
DR GO; GO:0022904; P:respiratory electron transport chain; IEA:InterPro.
DR GO; GO:0006814; P:sodium ion transport; IEA:UniProtKB-UniRule.
DR GO; GO:0055085; P:transmembrane transport; IEA:InterPro.
DR HAMAP; MF_00426; NqrB; 1.
DR InterPro; IPR010966; NqrB.
DR InterPro; IPR004338; NqrB/RnfD.
DR PANTHER; PTHR30578; PTHR30578; 1.
DR Pfam; PF03116; NQR2_RnfD_RnfE; 1.
DR PIRSF; PIRSF016055; NADH-UbQ_OxRdtase_B_su; 1.
DR TIGRFAMs; TIGR01937; nqrB; 1.
PE 3: Inferred from homology;
KW Cell inner membrane; Cell membrane; Flavoprotein; FMN; Ion transport;
KW Membrane; NAD; Phosphoprotein; Reference proteome; Sodium;
KW Sodium transport; Translocase; Transmembrane; Transmembrane helix;
KW Transport; Ubiquinone.
FT CHAIN 1..410
FT /note="Na(+)-translocating NADH-quinone reductase subunit
FT B"
FT /id="PRO_0000074436"
FT TRANSMEM 56..76
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT TRANSMEM 126..146
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT TRANSMEM 156..176
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT TRANSMEM 267..287
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT TRANSMEM 294..314
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT TRANSMEM 319..339
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT TRANSMEM 355..375
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT TRANSMEM 378..398
FT /note="Helical"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
FT MOD_RES 233
FT /note="FMN phosphoryl threonine"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00426"
SQ SEQUENCE 410 AA; 44707 MW; 0BDCF5007C928143 CRC64;
MGLKNLFEKM EPAFHKGGKY EKWYTLFEAT YTILYTPGTV TKKDSHVRDA LDSKRMMILV
WLALFPAMFW GMYNVGGQAI LATSHLGSLT DSIANNWHYA FSEAVGATLT ADAGWGSKML
LGATYFLPIY LTIFLVGGFW EVVFAMVRKH EINEGFFVTS ILLALIVPPT LPLWQAALAA
TFGVVVAKEV FGGVGKNFMN PALAGRAFLF FAYPAQISGD LVWTAADGFS GATALSQWAQ
GGQIALKHAV TGQEITWMDA FLGNIPGSIG EVSTLMLMIG AAIIVFARIA SWRIIAGVLV
GMAATATLFN LIGSETNLLF AMPWYWHLVL GGFALGMFFM ATDPVSASFT NKGKWWYGAL
IGVMCVVIRV ANPAYPEGMM LAILFANLFA PIFDYLVVQS NIKRRKAKAA
