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Protein

Nitrogenase iron protein

Gene

nifH

Organism
Clostridium acetobutylicum (strain ATCC 824 / DSM 792 / JCM 1419 / LMG 5710 / VKM B-1787)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Protein inferred from homologyi

Functioni

The key enzymatic reactions in nitrogen fixation are catalyzed by the nitrogenase complex, which has 2 components: the iron protein and the molybdenum-iron protein.UniRule annotation

Catalytic activityi

8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate.UniRule annotation

Cofactori

[4Fe-4S] clusterUniRule annotationNote: Binds 1 [4Fe-4S] cluster per dimer.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi94Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi129Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Nucleotide bindingi8 – 15ATPUniRule annotation8

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Oxidoreductase

Keywords - Biological processi

Nitrogen fixation

Keywords - Ligandi

4Fe-4S, ATP-binding, Iron, Iron-sulfur, Metal-binding, Nucleotide-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Nitrogenase iron proteinUniRule annotation (EC:1.18.6.1UniRule annotation)
Alternative name(s):
Nitrogenase Fe proteinUniRule annotation
Nitrogenase component IIUniRule annotation
Nitrogenase reductaseUniRule annotation
Gene namesi
Name:nifHUniRule annotation
Ordered Locus Names:CA_C0253
OrganismiClostridium acetobutylicum (strain ATCC 824 / DSM 792 / JCM 1419 / LMG 5710 / VKM B-1787)
Taxonomic identifieri272562 [NCBI]
Taxonomic lineageiBacteriaFirmicutesClostridiaClostridialesClostridiaceaeClostridium
Proteomesi
  • UP000000814 Componenti: Chromosome

Subcellular locationi

GO - Cellular componenti

Complete GO annotation...

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001394961 – 272Nitrogenase iron proteinAdd BLAST272

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei97ADP-ribosylarginine; by dinitrogenase reductase ADP-ribosyltransferaseUniRule annotation1

Post-translational modificationi

The reversible ADP-ribosylation of Arg-97 inactivates the nitrogenase reductase and regulates nitrogenase activity.UniRule annotation

Keywords - PTMi

ADP-ribosylation

Interactioni

Subunit structurei

Homodimer.UniRule annotation

Protein-protein interaction databases

STRINGi272562.CA_C0253.

Structurei

3D structure databases

ProteinModelPortaliQ97ME5.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the NifH/BchL/ChlL family.UniRule annotation

Phylogenomic databases

eggNOGiENOG4105DSM. Bacteria.
COG1348. LUCA.
HOGENOMiHOG000228826.
KOiK02588.
OMAiNKMFVIP.

Family and domain databases

CDDicd02040. NifH. 1 hit.
Gene3Di3.40.50.300. 1 hit.
HAMAPiMF_00533. NifH. 1 hit.
InterProiIPR030655. NifH/chlL_CS.
IPR000392. Nitogenase_NifH/Reductase_ChlL.
IPR005977. Nitrogenase_Fe_NifH.
IPR027417. P-loop_NTPase.
[Graphical view]
PIRSFiPIRSF000363. Nitrogenase_iron. 1 hit.
PRINTSiPR00091. NITROGNASEII.
SUPFAMiSSF52540. SSF52540. 1 hit.
TIGRFAMsiTIGR01287. nifH. 1 hit.
PROSITEiPS00746. NIFH_FRXC_1. 1 hit.
PS00692. NIFH_FRXC_2. 1 hit.
PS51026. NIFH_FRXC_3. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

Q97ME5-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MRQVAIYGKG GIGKSTTTQN LTSGLAELGK KIMVVGCDPK ADSTRLLLGG
60 70 80 90 100
LAQKTVLDTL REEGEDVDLD TIMKTGFGNI KCVESGGPEP GVGCAGRGII
110 120 130 140 150
TSINMLEQLG AYEDELDYVF YDVLGDVVCG GFAMPIREGK AKEIYIVASG
160 170 180 190 200
EMMAMYAANN ISKGISKFAN TGGVRLGGII CNSRKVKNEK ELLEAFAKEL
210 220 230 240 250
GTQLIYFVPR SHEVQKAEIN KQTVIQFNPK DEQADEYRAL AKAIDGNDMY
260 270
VVPKPMAQDK LEAILMEYGL LE
Length:272
Mass (Da):29,448
Last modified:October 1, 2001 - v1
Checksum:i43717E39233498C1
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AE001437 Genomic DNA. Translation: AAK78234.1.
PIRiG96930.
RefSeqiNP_346894.1. NC_003030.1.
WP_010963576.1. NC_003030.1.

Genome annotation databases

EnsemblBacteriaiAAK78234; AAK78234; CA_C0253.
GeneIDi1116436.
KEGGicac:CA_C0253.
PATRICi32034809. VBICloAce74127_0438.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AE001437 Genomic DNA. Translation: AAK78234.1.
PIRiG96930.
RefSeqiNP_346894.1. NC_003030.1.
WP_010963576.1. NC_003030.1.

3D structure databases

ProteinModelPortaliQ97ME5.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi272562.CA_C0253.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiAAK78234; AAK78234; CA_C0253.
GeneIDi1116436.
KEGGicac:CA_C0253.
PATRICi32034809. VBICloAce74127_0438.

Phylogenomic databases

eggNOGiENOG4105DSM. Bacteria.
COG1348. LUCA.
HOGENOMiHOG000228826.
KOiK02588.
OMAiNKMFVIP.

Family and domain databases

CDDicd02040. NifH. 1 hit.
Gene3Di3.40.50.300. 1 hit.
HAMAPiMF_00533. NifH. 1 hit.
InterProiIPR030655. NifH/chlL_CS.
IPR000392. Nitogenase_NifH/Reductase_ChlL.
IPR005977. Nitrogenase_Fe_NifH.
IPR027417. P-loop_NTPase.
[Graphical view]
PIRSFiPIRSF000363. Nitrogenase_iron. 1 hit.
PRINTSiPR00091. NITROGNASEII.
SUPFAMiSSF52540. SSF52540. 1 hit.
TIGRFAMsiTIGR01287. nifH. 1 hit.
PROSITEiPS00746. NIFH_FRXC_1. 1 hit.
PS00692. NIFH_FRXC_2. 1 hit.
PS51026. NIFH_FRXC_3. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiNIFH_CLOAB
AccessioniPrimary (citable) accession number: Q97ME5
Entry historyi
Integrated into UniProtKB/Swiss-Prot: April 3, 2002
Last sequence update: October 1, 2001
Last modified: November 2, 2016
This is version 102 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.