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Annotation rule MF_00533 |
Accession | MF_00533 |
Dates | 21-JAN-2002 (Created) 19-NOV-2022 (Last updated, Version 46) |
Name | NifH |
Scope | Bacteria
Archaea |
Templates | P00459 (NIFH1_AZOVI); P00456 (NIFH1_CLOPA): [Recover all] |
Triggered by |
Identifier |
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Protein name |
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Gene name |
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Function | 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. |
Catalytic activity | RHEA:21448: 16 ATP + 16 H2O + N2 + 8 reduced [2Fe-2S]-[ferredoxin] = 16 ADP + 6 H(+) + H2 + 2 NH4(+) + 8 oxidized [2Fe-2S]-[ferredoxin] + 16 phosphate
EC 1.18.6.1 |
Cofactor | [4Fe-4S] cluster Note: Binds 1 [4Fe-4S] cluster per dimer. |
Subunit | Homodimer. |
Ptm | The reversible ADP-ribosylation of #{Arg-101} inactivates the nitrogenase reductase and regulates nitrogenase activity. |
Similarity | Belongs to the NifH/BchL/ChlL family. |
Pfam | PF00142; Fer4_NifH; 1; |
PIRSF | PIRSF000363; Nitrogenase_iron; 1; |
PRINTS | PR00091; NITROGNASEII; 1; |
TIGRFAMs | TIGR01287; NifH; 1; |
PROSITE | PS00746; NIFH_FRXC_1; 1; |
PS00692; NIFH_FRXC_2; 1; | |
PS51026; NIFH_FRXC_3; 1; |
From: NIFH1_AZOVI (P00459) | ||||||||||||
Key | From | To | Description | Tag | Condition | FTGroup | ||||||
BINDING | 10 | 17 | /ligand="ATP" /ligand_id="ChEBI:CHEBI:30616 | G-K-G-G-I-[GA]-K-S | ||||||||
BINDING | 98 | 98 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_note="ligand shared between dimeric partners | C | ||||||||
BINDING | 133 | 133 | /ligand="[4Fe-4S] cluster" /ligand_id="ChEBI:CHEBI:49883" /ligand_note="ligand shared between dimeric partners | C | ||||||||
MOD_RES | 101 | 101 | ADP-ribosylarginine; by dinitrogenase reductase ADP-ribosyltransferase | R |
Size range | 263-307 amino acids |
Related rules | MF_00355 (BCHL) |
Fusion | None |
Comments | CROS5 has a divergent nifH with a 37 N-terminal extension; this sequence is not shown in the alignment and not used for the size range |