ID   A0A7G9L728_9FLAO        Unreviewed;       400 AA.
AC   A0A7G9L728;
DT   10-FEB-2021, integrated into UniProtKB/TrEMBL.
DT   10-FEB-2021, sequence version 1.
DT   13-SEP-2023, entry version 8.
DE   RecName: Full=Na(+)-translocating NADH-quinone reductase subunit B {ECO:0000256|HAMAP-Rule:MF_00426};
DE            Short=Na(+)-NQR subunit B {ECO:0000256|HAMAP-Rule:MF_00426};
DE            Short=Na(+)-translocating NQR subunit B {ECO:0000256|HAMAP-Rule:MF_00426};
DE            EC=7.2.1.1 {ECO:0000256|HAMAP-Rule:MF_00426};
DE   AltName: Full=NQR complex subunit B {ECO:0000256|HAMAP-Rule:MF_00426};
DE   AltName: Full=NQR-1 subunit B {ECO:0000256|HAMAP-Rule:MF_00426};
GN   Name=nqrB {ECO:0000256|HAMAP-Rule:MF_00426};
GN   ORFNames=H9W90_09450 {ECO:0000313|EMBL:QNM84427.1};
OS   Polaribacter pectinis.
OC   Bacteria; Bacteroidota; Flavobacteriia; Flavobacteriales;
OC   Flavobacteriaceae.
OX   NCBI_TaxID=2738844 {ECO:0000313|EMBL:QNM84427.1, ECO:0000313|Proteomes:UP000515808};
RN   [1] {ECO:0000313|EMBL:QNM84427.1, ECO:0000313|Proteomes:UP000515808}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=L12M9 {ECO:0000313|EMBL:QNM84427.1,
RC   ECO:0000313|Proteomes:UP000515808};
RA   Jeong Y.S.;
RT   "Polaribacter sp. L12M9 isolated from gut of the Korean scallop.";
RL   Submitted (AUG-2020) 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:0000256|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:0000256|HAMAP-
CC         Rule:MF_00426};
CC   -!- COFACTOR:
CC       Name=FMN; Xref=ChEBI:CHEBI:58210;
CC         Evidence={ECO:0000256|HAMAP-Rule:MF_00426,
CC         ECO:0000256|PIRSR:PIRSR016055-50};
CC   -!- SUBUNIT: Composed of six subunits; NqrA, NqrB, NqrC, NqrD, NqrE and
CC       NqrF. {ECO:0000256|HAMAP-Rule:MF_00426}.
CC   -!- SUBCELLULAR LOCATION: Cell membrane {ECO:0000256|HAMAP-Rule:MF_00426};
CC       Multi-pass membrane protein {ECO:0000256|HAMAP-Rule:MF_00426}.
CC   -!- SIMILARITY: Belongs to the NqrB/RnfD family. {ECO:0000256|HAMAP-
CC       Rule:MF_00426}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; CP060695; QNM84427.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A7G9L728; -.
DR   KEGG; ppec:H9W90_09450; -.
DR   Proteomes; UP000515808; Chromosome.
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   NCBIfam; TIGR01937; nqrB; 1.
DR   PANTHER; PTHR30578; ELECTRON TRANSPORT COMPLEX PROTEIN RNFD; 1.
DR   PANTHER; PTHR30578:SF1; NA(+)-TRANSLOCATING NADH-QUINONE REDUCTASE SUBUNIT B; 1.
DR   Pfam; PF03116; NQR2_RnfD_RnfE; 1.
DR   PIRSF; PIRSF016055; NADH-UbQ_OxRdtase_B_su; 1.
PE   3: Inferred from homology;
KW   Cell inner membrane {ECO:0000256|ARBA:ARBA00022519};
KW   Cell membrane {ECO:0000256|ARBA:ARBA00022475, ECO:0000256|HAMAP-
KW   Rule:MF_00426};
KW   Flavoprotein {ECO:0000256|ARBA:ARBA00022630, ECO:0000256|HAMAP-
KW   Rule:MF_00426};
KW   FMN {ECO:0000256|ARBA:ARBA00022643, ECO:0000256|HAMAP-Rule:MF_00426};
KW   Ion transport {ECO:0000256|ARBA:ARBA00023065, ECO:0000256|HAMAP-
KW   Rule:MF_00426};
KW   Membrane {ECO:0000256|ARBA:ARBA00023136, ECO:0000256|HAMAP-Rule:MF_00426};
KW   NAD {ECO:0000256|ARBA:ARBA00023027, ECO:0000256|HAMAP-Rule:MF_00426};
KW   Phosphoprotein {ECO:0000256|ARBA:ARBA00022553, ECO:0000256|HAMAP-
KW   Rule:MF_00426}; Reference proteome {ECO:0000313|Proteomes:UP000515808};
KW   Sodium {ECO:0000256|HAMAP-Rule:MF_00426};
KW   Sodium transport {ECO:0000256|HAMAP-Rule:MF_00426};
KW   Translocase {ECO:0000256|ARBA:ARBA00022967, ECO:0000256|HAMAP-
KW   Rule:MF_00426};
KW   Transmembrane {ECO:0000256|ARBA:ARBA00022692, ECO:0000256|HAMAP-
KW   Rule:MF_00426};
KW   Transmembrane helix {ECO:0000256|ARBA:ARBA00022989, ECO:0000256|HAMAP-
KW   Rule:MF_00426};
KW   Transport {ECO:0000256|ARBA:ARBA00022448, ECO:0000256|HAMAP-Rule:MF_00426};
KW   Ubiquinone {ECO:0000256|HAMAP-Rule:MF_00426, ECO:0000313|EMBL:QNM84427.1}.
FT   TRANSMEM        56..77
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   TRANSMEM        98..124
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   TRANSMEM        144..165
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   TRANSMEM        242..265
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   TRANSMEM        272..290
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   TRANSMEM        310..328
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   TRANSMEM        340..358
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   TRANSMEM        364..384
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426"
FT   MOD_RES         220
FT                   /note="FMN phosphoryl threonine"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00426,
FT                   ECO:0000256|PIRSR:PIRSR016055-50"
SQ   SEQUENCE   400 AA;  44037 MW;  7A28D5AE9B45EFF2 CRC64;
     MGLKQNLHNL KEKYKGTKMA PAFNAIHTFL YLPNEVTHKG GTHIKAADDL KRTMNIVIMA
     LIPCLIFGMF NAGYQHYAAI DGSLRTDVLA NFFTFDNLWI GIIKVLPLVI VSYGVGLLVE
     FIFAVIKGHE VEEGYLVTGM LVPLIVPVDT PLWMLAVAVV FGVVIGKEVF GGTGMNILNP
     ALTIRAFLFF AYPTWMSGDK VWVYDAVERT GTADAISGET ILGSYAQNQE VIYSTWDKFA
     GFIPGSIGET STLLILLGAA FLIFTKIGSW RIIVSTFIGA AVMGLIFNQI VAADIITESS
     KFYGLMNTVW WEHLMIGGLA FGAVFMATDP VTASQTNKGK WIYGFLIGFI SIMIRVFNPA
     YPEGVFLAIL LMNVFAPTID HYVVQGNVKK RLKRTKVKTA
//