ID   NAPA_CAMJE              Reviewed;         924 AA.
AC   Q9PPD9; Q0PAB0;
DT   07-FEB-2006, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2000, sequence version 1.
DT   04-NOV-2026, entry version 130.
DE   RecName: Full=Periplasmic nitrate reductase {ECO:0000255|HAMAP-Rule:MF_01630};
DE            EC=1.9.6.1 {ECO:0000255|HAMAP-Rule:MF_01630};
DE   Flags: Precursor;
GN   Name=napA {ECO:0000255|HAMAP-Rule:MF_01630}; OrderedLocusNames=Cj0780;
OS   Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 /
OS   NCTC 11168).
OC   Bacteria; Pseudomonadati; Campylobacterota; Epsilonproteobacteria;
OC   Campylobacterales; Campylobacteraceae; Campylobacter.
OX   NCBI_TaxID=192222;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700819 / NCTC 11168;
RX   PubMed=10688204; DOI=10.1038/35001088;
RA   Parkhill J., Wren B.W., Mungall K.L., Ketley J.M., Churcher C.M.,
RA   Basham D., Chillingworth T., Davies R.M., Feltwell T., Holroyd S.,
RA   Jagels K., Karlyshev A.V., Moule S., Pallen M.J., Penn C.W., Quail M.A.,
RA   Rajandream M.A., Rutherford K.M., van Vliet A.H.M., Whitehead S.,
RA   Barrell B.G.;
RT   "The genome sequence of the food-borne pathogen Campylobacter jejuni
RT   reveals hypervariable sequences.";
RL   Nature 403:665-668(2000).
CC   -!- FUNCTION: Catalytic subunit of the periplasmic nitrate reductase
CC       complex NapAB. Receives electrons from NapB and catalyzes the reduction
CC       of nitrate to nitrite. {ECO:0000255|HAMAP-Rule:MF_01630}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2 Fe(II)-[cytochrome] + nitrate + 2 H(+) = 2 Fe(III)-
CC         [cytochrome] + nitrite + H2O; Xref=Rhea:RHEA:12909, Rhea:RHEA-
CC         COMP:11777, Rhea:RHEA-COMP:11778, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:16301, ChEBI:CHEBI:17632,
CC         ChEBI:CHEBI:29033, ChEBI:CHEBI:29034; EC=1.9.6.1;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01630};
CC   -!- COFACTOR:
CC       Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01630};
CC       Note=Binds 1 [4Fe-4S] cluster. {ECO:0000255|HAMAP-Rule:MF_01630};
CC   -!- COFACTOR:
CC       Name=Mo-bis(molybdopterin guanine dinucleotide);
CC         Xref=ChEBI:CHEBI:60539; Evidence={ECO:0000255|HAMAP-Rule:MF_01630};
CC       Note=Binds 1 molybdenum-bis(molybdopterin guanine dinucleotide) (Mo-
CC       bis-MGD) cofactor per subunit. {ECO:0000255|HAMAP-Rule:MF_01630};
CC   -!- SUBUNIT: Component of the periplasmic nitrate reductase NapAB complex
CC       composed of NapA and NapB. {ECO:0000255|HAMAP-Rule:MF_01630}.
CC   -!- SUBCELLULAR LOCATION: Periplasm {ECO:0000255|HAMAP-Rule:MF_01630}.
CC   -!- PTM: Predicted to be exported by the Tat system. The position of the
CC       signal peptide cleavage has not been experimentally proven.
CC       {ECO:0000255|HAMAP-Rule:MF_01630}.
CC   -!- SIMILARITY: Belongs to the prokaryotic molybdopterin-containing
CC       oxidoreductase family. NasA/NapA/NarB subfamily. {ECO:0000255|HAMAP-
CC       Rule:MF_01630}.
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DR   EMBL; AL111168; CAL34908.1; -; Genomic_DNA.
DR   PIR; D81349; D81349.
DR   RefSeq; WP_002852404.1; NC_002163.1.
DR   RefSeq; YP_002344187.1; NC_002163.1.
DR   PDB; 9PXT; EM; 3.00 A; A=1-924.
DR   AlphaFoldDB; Q9PPD9; -.
DR   EMDB; EMD-71994; -.
DR   SMR; Q9PPD9; -.
DR   IntAct; Q9PPD9; 3.
DR   STRING; 192222.Cj0780; -.
DR   PaxDb; 192222-Cj0780; -.
DR   EnsemblBacteria; CAL34908; CAL34908; Cj0780.
DR   GeneID; 905089; -.
DR   KEGG; cje:Cj0780; -.
DR   PATRIC; fig|192222.6.peg.768; -.
DR   eggNOG; COG0243; Bacteria.
DR   HOGENOM; CLU_000422_13_4_7; -.
DR   OMA; AACQVHN; -.
DR   OrthoDB; 7376058at2; -.
DR   BRENDA; 1.9.6.1; 13746.
DR   Proteomes; UP000000799; Chromosome.
DR   GO; GO:0016020; C:membrane; IEA:TreeGrafter.
DR   GO; GO:0009325; C:nitrate reductase complex; IEA:TreeGrafter.
DR   GO; GO:0042597; C:periplasmic space; IEA:UniProtKB-SubCell.
DR   GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:InterPro.
DR   GO; GO:0009055; F:electron transfer activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0030151; F:molybdenum ion binding; IEA:InterPro.
DR   GO; GO:0043546; F:molybdopterin cofactor binding; IEA:InterPro.
DR   GO; GO:0050140; F:nitrate reductase (cytochrome) activity; IEA:UniProtKB-EC.
DR   GO; GO:0045333; P:cellular respiration; IEA:UniProtKB-ARBA.
DR   GO; GO:0006777; P:Mo-molybdopterin cofactor biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0042128; P:nitrate assimilation; IEA:UniProtKB-UniRule.
DR   CDD; cd02791; MopB_CT_Nitrate-R-NapA-like; 1.
DR   FunFam; 2.40.40.20:FF:000005; Periplasmic nitrate reductase; 1.
DR   Gene3D; 2.40.40.20; -; 1.
DR   Gene3D; 3.30.200.210; -; 2.
DR   Gene3D; 3.40.50.740; -; 1.
DR   Gene3D; 3.40.228.10; Dimethylsulfoxide Reductase, domain 2; 1.
DR   HAMAP; MF_01630; Nitrate_reduct_NapA; 1.
DR   InterPro; IPR009010; Asp_de-COase-like_dom_sf.
DR   InterPro; IPR041957; CT_Nitrate-R-NapA-like.
DR   InterPro; IPR006657; MoPterin_dinucl-bd_dom.
DR   InterPro; IPR006656; Mopterin_OxRdtase.
DR   InterPro; IPR006963; Mopterin_OxRdtase_4Fe-4S_dom.
DR   InterPro; IPR027467; MopterinOxRdtase_cofactor_BS.
DR   InterPro; IPR010051; Periplasm_NO3_reductase_lsu.
DR   InterPro; IPR019546; TAT_signal_bac_arc.
DR   NCBIfam; TIGR01706; NAPA; 1.
DR   NCBIfam; NF010055; napA; 1.
DR   NCBIfam; TIGR01409; TAT_signal_seq; 1.
DR   PANTHER; PTHR43105:SF11; PERIPLASMIC NITRATE REDUCTASE; 1.
DR   PANTHER; PTHR43105; RESPIRATORY NITRATE REDUCTASE; 1.
DR   Pfam; PF04879; Molybdop_Fe4S4; 1.
DR   Pfam; PF00384; Molybdopterin; 1.
DR   Pfam; PF01568; Molydop_binding; 1.
DR   SMART; SM00926; Molybdop_Fe4S4; 1.
DR   SUPFAM; SSF50692; ADC-like; 1.
DR   SUPFAM; SSF53706; Formate dehydrogenase/DMSO reductase, domains 1-3; 1.
DR   PROSITE; PS51669; 4FE4S_MOW_BIS_MGD; 1.
DR   PROSITE; PS00551; MOLYBDOPTERIN_PROK_1; 1.
PE   1: Evidence at protein level;
KW   3D-structure; 4Fe-4S; Electron transport; Iron; Iron-sulfur; Metal-binding;
KW   Molybdenum; Nitrate assimilation; Oxidoreductase; Periplasm;
KW   Reference proteome; Signal; Transport.
FT   SIGNAL          1..30
FT                   /note="Tat-type signal"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   CHAIN           31..924
FT                   /note="Periplasmic nitrate reductase"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT                   /id="PRO_0000045980"
FT   DOMAIN          35..91
FT                   /note="4Fe-4S Mo/W bis-MGD-type"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         42
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         45
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         49
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         77
FT                   /ligand="[4Fe-4S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:49883"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         79
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         147
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         172
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         176
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         209..216
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         417
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         421
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         527
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         552..553
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         575
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         602
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         814..823
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         890
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         898
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
FT   BINDING         915
FT                   /ligand="Mo-bis(molybdopterin guanine dinucleotide)"
FT                   /ligand_id="ChEBI:CHEBI:60539"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01630"
SQ   SEQUENCE   924 AA;  104944 MW;  9DA5E87E0263BC9A CRC64;
     MNRRDFIKNT AIASAASVAG LSVPSSMLGA QEEDWKWDKA VCRFCGTGCG IMIARKDGKI
     VATKGDPAAP VNRGLNCIKG YFNAKIMYGE DRLVMPLLRM NEKGEFDKKG KFQQVSWQRA
     FDEMEKQFKK AYNELGVTGI GIFGSGQYTI QEGYAALKLA KAGFRTNNID PNARHCMASA
     VVGFMQTFGV DEPSGCYDDI ELTDTIITWG ANMAEMHPIL WSRVSDRKLS NLDKVKVVNL
     STFSNRTSNI ADIEIIFKPN TDLAIWNYIA REIVYNHPEA MDMKFIKDHC VFATGYADIG
     YGMRNNPNHP KFKESEKDTV EKENVITLDD EEATSLSYLG VKAGDKFEMK HQGVADKNWE
     ISFDEFKKGL APYTLEYTAR VAKGDDNESL EDFKKKLQEL ANLYIEKNRK VVSFWTMGFN
     QHTRGSWVNE QAYMVHFLLG KQAKPGSGAF SLTGQPSACG TAREVGTFSH RLPADMVVAN
     PKHREISEKI WKVPAKTINP KPGSPYLNIM RDLEDGKIKF AWVQVNNPWQ NTANANHWIA
     AAREMDNFIV VSDCYPGISA KVADLILPSA MIYEKWGAYG NAERRTQHWK QQVLPVGAAM
     SDTWQILEFA KRFKLKEVWK EQKVDNKLTL PSVLEEAKAM GYSEDDTLFD VLFANKEAKS
     FNPNDAIAKG FDNTDVKGDE RKIQGSDGKE FTGYGFFVQK YLWEEYRKFG LGHGHDLADF
     DTYHKVRGLR WPVVNGKETQ WRFNTKFDYY AKKAAPNSDF AFYGDFNKML TNGDLIAPKD
     EKEHSIKNKA KIFFRPFMKA PERPSKEYPF WLATGRVLEH WHSGTMTMRV PELYRAVPEA
     LCYMSEKDGE KLGLNQGDLV WVESRRGKVK ARVDMRGRNK PPVGLVYVPW FDENVYINKV
     TLDATCPLSK QTDFKKCAVK IYKA
//