NIFH2_AZOCH
ID NIFH2_AZOCH Reviewed; 290 AA.
AC P06118;
DT 01-JAN-1988, integrated into UniProtKB/Swiss-Prot.
DT 01-JAN-1988, sequence version 1.
DT 03-AUG-2022, entry version 115.
DE RecName: Full=Nitrogenase iron protein 2;
DE EC=1.18.6.1;
DE AltName: Full=Nitrogenase Fe protein 2;
DE AltName: Full=Nitrogenase component II;
DE AltName: Full=Nitrogenase reductase;
GN Name=vnfH; Synonyms=nifH*, nifH2;
OS Azotobacter chroococcum mcd 1.
OC Bacteria; Proteobacteria; Gammaproteobacteria; Pseudomonadales;
OC Pseudomonadaceae; Azotobacter.
OX NCBI_TaxID=355;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=2388847; DOI=10.1093/nar/18.15.4616;
RA Fallik E., Robson R.L.;
RT "Completed sequence of the region encoding the structural genes for the
RT vanadium nitrogenase of Azotobacter chroococcum.";
RL Nucleic Acids Res. 18:4616-4616(1990).
RN [2]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=15966103; DOI=10.1002/j.1460-2075.1986.tb04341.x;
RA Robson R.L., Woodley P., Jones R.;
RT "Second gene (nifH*) coding for a nitrogenase iron protein in Azotobacter
RT chroococcum is adjacent to a gene coding for a ferredoxin-like protein.";
RL EMBO J. 5:1159-1163(1986).
CC -!- FUNCTION: The key enzymatic reactions in nitrogen fixation are
CC catalyzed by the nitrogenase complex, which has 2 components: the iron
CC protein (component 2) and a component 1 which is either a molybdenum-
CC iron protein, a vanadium-iron, or an iron-iron protein.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=16 ATP + 16 H2O + N2 + 8 reduced [2Fe-2S]-[ferredoxin] = 16
CC ADP + 6 H(+) + H2 + 2 NH4(+) + 8 oxidized [2Fe-2S]-[ferredoxin] + 16
CC phosphate; Xref=Rhea:RHEA:21448, Rhea:RHEA-COMP:10000, Rhea:RHEA-
CC COMP:10001, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:17997,
CC ChEBI:CHEBI:18276, ChEBI:CHEBI:28938, ChEBI:CHEBI:30616,
CC ChEBI:CHEBI:33737, ChEBI:CHEBI:33738, ChEBI:CHEBI:43474,
CC ChEBI:CHEBI:456216; EC=1.18.6.1;
CC -!- COFACTOR:
CC Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC Note=Binds 1 [4Fe-4S] cluster per dimer.;
CC -!- SUBUNIT: Homodimer.
CC -!- PTM: The reversible ADP-ribosylation of Arg-101 inactivates the
CC nitrogenase reductase and regulates nitrogenase activity.
CC {ECO:0000250}.
CC -!- MISCELLANEOUS: This subunit is associated with the vanadium-iron
CC nitrogenase component 2.
CC -!- SIMILARITY: Belongs to the NifH/BchL/ChlL family. {ECO:0000305}.
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DR EMBL; X51756; CAA36055.1; -; Genomic_DNA.
DR EMBL; X03916; CAA27553.1; -; Genomic_DNA.
DR PIR; A25103; A25103.
DR AlphaFoldDB; P06118; -.
DR SMR; P06118; -.
DR GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-KW.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR GO; GO:0018697; F:carbonyl sulfide nitrogenase activity; IEA:UniProtKB-EC.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0016163; F:nitrogenase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0009399; P:nitrogen fixation; IEA:UniProtKB-UniRule.
DR Gene3D; 3.40.50.300; -; 1.
DR HAMAP; MF_00533; NifH; 1.
DR InterPro; IPR030655; NifH/chlL_CS.
DR InterPro; IPR000392; NifH/frxC.
DR InterPro; IPR005977; Nitrogenase_Fe_NifH.
DR InterPro; IPR027417; P-loop_NTPase.
DR PANTHER; PTHR42864; PTHR42864; 1.
DR Pfam; PF00142; Fer4_NifH; 1.
DR PIRSF; PIRSF000363; Nitrogenase_iron; 1.
DR SUPFAM; SSF52540; SSF52540; 1.
DR TIGRFAMs; TIGR01287; nifH; 1.
DR PROSITE; PS00746; NIFH_FRXC_1; 1.
DR PROSITE; PS00692; NIFH_FRXC_2; 1.
DR PROSITE; PS51026; NIFH_FRXC_3; 1.
PE 3: Inferred from homology;
KW 4Fe-4S; ADP-ribosylation; ATP-binding; Iron; Iron-sulfur; Metal-binding;
KW Nitrogen fixation; Nucleotide-binding; Oxidoreductase.
FT CHAIN 1..290
FT /note="Nitrogenase iron protein 2"
FT /id="PRO_0000139489"
FT BINDING 10..17
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255"
FT BINDING 98
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_note="ligand shared between dimeric partners"
FT /evidence="ECO:0000250"
FT BINDING 133
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_note="ligand shared between dimeric partners"
FT /evidence="ECO:0000250"
FT MOD_RES 101
FT /note="ADP-ribosylarginine; by dinitrogenase reductase ADP-
FT ribosyltransferase"
FT /evidence="ECO:0000250"
SQ SEQUENCE 290 AA; 31074 MW; E7FF833BA4098E08 CRC64;
MALRQCAIYG KGGIGKSTTT QNLVAALAEA GKKVMIVGCD PKADSTRLIL HSKAQNTVME
MAASAGSGED LELEDVLQIG YGGVKCVESG GPEPGVGCAG RGVITAINFL EEEGAYSDDL
DFVFYDVLGD VVCGGFAMPI RENKAQEIYI VCSGEMMAMY AANNIAKGIV KYAHSGSVRL
GGLICNSRKT DREDELIMAL AAKIGTQMIH FVPRDNVVQH AEIRRMTVIE YDPKAKQADE
YRALAQKILN NKLLVIPNPA SMEDLEELLM EFGIMEAEDE SIVGKAGAEG
