CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
1 | Mainly Alpha |
|
1.20 | Up-down Bundle |
|
1.20.89 | Nitrogenase Molybdenum-iron Protein, subunit B; domain 4 |
|
1.20.89.10 | Nitrogenase Molybdenum-iron Protein, subunit B, domain 4 |
Domain Context
CATH Clusters
| Superfamily | Nitrogenase Molybdenum-iron Protein, subunit B, domain 4 |
| Functional Family |
Enzyme Information
| 1.18.6.1 |
Nitrogenase.
based on mapping to UniProt P09772
8 reduced ferredoxin + 8 H(+) + N(2) + 16 ATP + 16 H(2)O = 8 oxidized ferredoxin + H(2) + 2 NH(3) + 16 ADP + 16 phosphate.
-!- The enzyme is a complex of two components (namely dinitrogen reducatse and dinitrogenase). -!- Dinitrogen reductase is a [4Fe-4S] protein, which, in the presence of two molecules of ATP, transfers an electron from ferredoxin to the dinitrogenase component. -!- Dinitrogenase is a molybdenum-iron protein that reduces dinitrogen to two molecules of ammonia in three successive two-electron reductions via diazene and hydrazine. -!- The reduction is initiated by formation of hydrogen in stoichiometric amounts. -!- Acetylene is reduced to ethylene (but only very slowly to ethane), azide to nitrogen and ammonia, and cyanide to methane and ammonia. -!- In the absence of a suitable substrate, hydrogen is slowly formed. -!- Ferredoxin may be replaced by flavodoxin (see EC 1.19.6.1). -!- The enzyme does not reduce CO (cf. EC 1.18.6.2). -!- Formerly EC 1.18.2.1.
|
UniProtKB Entries (1)
| P09772 |
NIFK_KLEPN
Klebsiella pneumoniae
Nitrogenase molybdenum-iron protein beta chain
|
PDB Structure
| PDB | 1QH1 |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | |
| Primary Citation |
New insights into structure-function relationships in nitrogenase: A 1.6 A resolution X-ray crystallographic study of Klebsiella pneumoniae MoFe-protein.
J.Mol.Biol.
|