FUNCTION: Catalytic subunit of the periplasmic nitrate reductase (NAP). Only expressed at high levels during aerobic growth. NapAB complex receives electrons from the membrane-anchored tetraheme protein napC, thus allowing electron flow between membrane and periplasm. Essential function for nitrate assimilation and may have a role in anaerobic metabolism (By similarity).
CATALYTIC ACTIVITY: Nitrite + acceptor = nitrate + reduced acceptor.
COFACTOR: Binds 1 4Fe-4S cluster (By similarity).
COFACTOR: Binds 1 molybdenum ion per subunit (By similarity).
COFACTOR: Binds 2 molybdopterin guanine dinucleotide (MGD) groups per subunit (By similarity).
SUBUNIT: Interacts with napB (By similarity).
SUBCELLULAR LOCATION: Periplasm (By similarity).
PTM: Predicted to be exported by the Tat system. The position of the signal peptide cleavage has not been experimentally proven.
SIMILARITY: Belongs to the prokaryotic molybdopterin-containing oxidoreductase family. NasA/napA/narB subfamily.

Copyright

Copyrighted by the UniProt Consortium, see http://www.uniprot.org/terms. Distributed under the Creative Commons Attribution-NoDerivs License.

Cross-references

Sequence databases

EMBL

AE006197; AAK03678.1; -; Genomic_DNA.

[EMBL / GenBank / DDBJ] [CoDingSequence]

RefSeq

NP_246533.1; -.

3D structure databases

HSSP

Q53176; 1OGY. [HSSP ENTRY / PDB]

SMR

Q9CKL8; 38-827.

ModBase

Q9CKL8.

Ontologies

GO:0009055;	Molecular function: electron carrier activity (inferred from electronic annotation from HAMAP).
GO:0005506;	Molecular function: iron ion binding (inferred from electronic annotation from HAMAP).
GO:0008940;	Molecular function: nitrate reductase activity (inferred from electronic annotation from HAMAP).
GO:0006777;	Biological process: Mo-molybdopterin cofactor biosynthetic process (inferred from electronic annotation from HAMAP).
GO:0042128;	Biological process: nitrate assimilation (inferred from electronic annotation from HAMAP).
QuickGo view.

Family and domain databases

HAMAP

MF_01630; -; 1.
PBIL [Tree]

InterPro

IPR009010; Asp_de-COase-like_fold.
IPR006656; Mopterin_OxRdtase.
IPR006963; Mopterin_OxRdtase_Fe4S4.
IPR006655; Mopterin_OxRdtase_prok_CS.
IPR006657; MPT_dinuc_bd.
IPR010051; NO3_reductase_lsu_periplasm.
IPR006311; Tat.
Graphical view of domain structure.

Gene3D

G3DSA:2.40.40.20; Asp_decarboxylase-like_fold; 1.

Pfam

PF04879; Molybdop_Fe4S4; 1.
PF00384; Molybdopterin; 1.
PF01568; Molydop_binding; 1.
Pfam graphical view of domain structure.

TIGRFAMs

TIGR01706; NAPA; 1.
TIGR01409; TAT_signal_seq; 1.

PROSITE

PS00551; MOLYBDOPTERIN_PROK_1; 1.
PS00490; MOLYBDOPTERIN_PROK_2; FALSE_NEG.
PS00932; MOLYBDOPTERIN_PROK_3; FALSE_NEG.
PS51318; TAT; 1.
PROSITE graphical view of domain structure (profiles).

BLOCKS

Q9CKL8.

Genome annotation databases

1244941; -.

AE004439_GR; PM1594.

pmu:PM1594; -.

fig|272843.1.peg.1595; -.

Phylogenomic databases

HOGENOM

Q9CKL8; -.

Genome annotation databases

CMR

Q9CKL8; PM1594.

Other

ProtoNet

Q9CKL8.

UniRef

View cluster of proteins with at least 50% / 90% / 100% identity.

Keywords

4Fe-4S; Complete proteome; Electron transport; Iron; Iron-sulfur; Metal-binding; Molybdenum; Nitrate assimilation; Oxidoreductase; Periplasm; Signal; Transport.

Features

Feature table viewer

`Key`	`From To`	`Length`	`Description`	`FTId`
`SIGNAL`	`1 32`	`32`	`Tat-type signal (Potential).`
`CHAIN`	`33 828`	`796`	`Periplasmic nitrate reductase.`	`PRO_0000045992`
`METAL`	`45 45`		`Iron-sulfur (4Fe-4S) (By similarity).`
`METAL`	`48 48`		`Iron-sulfur (4Fe-4S) (By similarity).`
`METAL`	`52 52`		`Iron-sulfur (4Fe-4S) (By similarity).`
`METAL`	`80 80`		`Iron-sulfur (4Fe-4S) (By similarity).`

Sequence information

Length: 828 AA [This is the length of the unprocessed precursor]

Molecular weight: 93356 Da [This is the MW of the unprocessed precursor]

CRC64: 313637544961A2BF [This is a checksum on the sequence]

        10         20         30         40         50         60 
MNLSRRDFMK TNAAVAAAAV AGLAIPVKNV EASPDKIIKW DKAPCRFCGT GCSVLVGTQN 

        70         80         90        100        110        120 
GRVVASQGDP DADVNRGLNC IKGYFLPKIM YGKDRLTSPM LRMTNGKFDK HGEFTPVSWD 

       130        140        150        160        170        180 
QAFTIMAEKF KKALKEKGPN GAGMFTSGQS TIFEGIAKSK LFKAGLRSNN IDPNARHCMA 

       190        200        210        220        230        240 
SAAVAFMRTF GMDEPMGCYD DIEKADAFVL WGSNMAEMHP ILWSRISDRR LSHPDVKVAV 

       250        260        270        280        290        300 
LSTFEHRSFE LADLGVIFTP QSDLAIMNYI ANYLIQHDAI DHDFIQKHTK FKRGETDIGY 

       310        320        330        340        350        360 
GLRETHELEK AAKNVKTAGK MHDSDFEEYK KLVAPYTLEK AHEISGVPKE QLEALAKMYA 

       370        380        390        400        410        420 
DPKLNIVSFW TMGFNQHTRG VWANHLIYNI HLLTGKISKP GCGPFSLTGQ PSACGTAREV 

       430        440        450        460        470        480 
GTFAHRLPAD LVVTNPKHVE KAEKLWKLPK GVIQTQVGYH AVAQDRALKD KKMNVLWQMC 

       490        500        510        520        530        540 
TNNMQGGPNI NQERFPGWRD EENFVIVSDP YPTVSALAAD LILPTAMWVE KEGAYGNAER 

       550        560        570        580        590        600 
RTQFWYQQVK APGESKSDVW QLVEFSKYFT TDEMWPAEVL AANPEYKGKT LYEVLFRNGQ 

       610        620        630        640        650        660 
VDKFQVPTDK PGYMNDEAEH FGFYLQKGLF EEYAVFGRGH GHDLADFETY HKARGLRWPV 

       670        680        690        700        710        720 
VDGKETLWRY REGYDPYVKE GEGVAFYGYP DKKAIILAVP YEPPAEAPNA EYDLWLTTGR 

       730        740        750        760        770        780 
VLEHWHTGTM TRRVPELHRS FPNNLVWMHP LDAKKRGLRH GDKVKISSRR GEMISHLDTR 

       790        800        810        820 
GRNKVPQGLV YTTFFDAGQL ANYLTLDATD PISKETDFKK CAVKVEKA

Q9CKL8 in FASTA format

View entry in original UniProtKB/Swiss-Prot format
View entry in raw text format (no links)
Report form for errors/updates in this UniProtKB/Swiss-Prot entry

	BLAST submission on ExPASy/SIB or at NCBI (USA)		Sequence analysis tools: ProtParam, ProtScale, Compute pI/Mw, PeptideMass, PeptideCutter, Dotlet (Java)
	ScanProsite, MotifScan		Submit a homology modeling request to SWISS-MODEL
	NPSA Sequence analysis tools