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

CP000680; ABP85736.1; -; Genomic_DNA.

[EMBL / GenBank / DDBJ] [CoDingSequence]

RefSeq

YP_001188468.1; -.

3D structure databases

ModBase

A4XWM0.

Ontologies

GO:0042597;	Cellular component: periplasmic space (inferred from electronic annotation from UniProtKB-KW).
GO:0051539;	Molecular function: 4 iron, 4 sulfur cluster binding (inferred from electronic annotation from InterPro).
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:0030151;	Molecular function: molybdenum ion binding (inferred from electronic annotation from InterPro).
GO:0008940;	Molecular function: nitrate reductase activity (inferred from electronic annotation from HAMAP).
GO:0022900;	Biological process: electron transport chain (inferred from electronic annotation from UniProtKB-KW).
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).
GO:0006810;	Biological process: transport (inferred from electronic annotation from UniProtKB-KW).
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).

Genome annotation databases

GeneID

5107699; -.

GenomeReviews

CP000680_GR; Pmen_2981.

KEGG

pmy:Pmen_2981; -.

CMR

A4XWM0; Pmen_2981.

Other

ProtoNet

A4XWM0.

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 29`	`29`	`Tat-type signal (Potential).`
`CHAIN`	`30 834`	`805`	`Periplasmic nitrate reductase.`	`PRO_5000240716`
`METAL`	`48 48`		`Iron-sulfur (4Fe-4S) (By similarity).`
`METAL`	`51 51`		`Iron-sulfur (4Fe-4S) (By similarity).`
`METAL`	`55 55`		`Iron-sulfur (4Fe-4S) (By similarity).`
`METAL`	`83 83`		`Iron-sulfur (4Fe-4S) (By similarity).`

Sequence information

Length: 834 AA [This is the length of the unprocessed precursor]

Molecular weight: 93453 Da [This is the MW of the unprocessed precursor]

CRC64: 7C8384E88B6363B1 [This is a checksum on the sequence]

        10         20         30         40         50         60 
MKLSRREFAK ANAAAIAAAA AGLPLASTAS NLITEADMTR LDWNKAPCRF CGTGCSVMVA 

        70         80         90        100        110        120 
TRDNRVVATH GDVKAEVNRG LNCVKGYFLS KIMYGVDRLT QPLLRMKNGV YDKQGEFQPV 

       130        140        150        160        170        180 
SWDQAFDIMA QKIKQAIAEQ GPEAVGMFGS GQWTVWEGYA ANKLMKAGFR SNNIDPNARH 

       190        200        210        220        230        240 
CMASAVMGFM RTFGMDEPMG CYDDIEAADA FVLWGSNMAE MHPILWSRVT DRRLSHPNTR 

       250        260        270        280        290        300 
VAVLSTFEHR SFDLADIPLV FKPQTDLLIL NYIANHIIES GAVNKDFVGK HTKFARGADD 

       310        320        330        340        350        360 
IGYGLRADNP LEMQAKNAAK ANTWEDMSFE QFAAFVKPYT LERTAKESGV AAERLKALAK 

       370        380        390        400        410        420 
LYADPKRKVM SFWTMGFNQH TRGVWANNLI YNLHLLTGKI SEPGNSPFSL TGQPSACGTA 

       430        440        450        460        470        480 
REVGTFSHRL PADMLVANPK HRETAEKIWK LPPGTIQEKP GFHAVEQSRK LKDGVLKVYW 

       490        500        510        520        530        540 
TQVSNNMQAG PNVMQEILPG WRNPQAFVIV SDVYPTVSAQ AADLILPSAM WVEKEGAYGN 

       550        560        570        580        590        600 
AERRTQFWHQ LVKAPGEAKS DLWQLVEFSK RFTTDEVWPA ELLAKAPDYK GKTLYQVLFA 

       610        620        630        640        650        660 
NGQVDQFPSE QIEAGYANDE AEAFGFYLQK GLFEEYARFG RGHAHDLAPF DSYHAERGLR 

       670        680        690        700        710        720 
WPVVDGKETR WRYREGHDPY VEKGSGVQFY GYPDKRALIF ALPYEPPAEA PDDEFPFWLS 

       730        740        750        760        770        780 
TGRVLEHWHT GSMTQRVEEL HGAVPDALVY MHPDDAKALK ARRGSEVKVI SRRGEIRARI 

       790        800        810        820        830 
ETRGRNKPPR GLVFVPFFDA NKLINKVTLD ATDPISKQTD YKKCAVKIEL VSLA

A4XWM0 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