CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
3 | Alpha Beta |
|
3.40 | 3-Layer(aba) Sandwich |
|
3.40.50 | Rossmann fold |
|
3.40.50.300 | P-loop containing nucleotide triphosphate hydrolases |
Domain Context
CATH Clusters
| Superfamily | P-loop containing nucleotide triphosphate hydrolases |
| Functional Family | Nitrogenase iron protein 2 |
Enzyme Information
| 1.18.6.1 |
Nitrogenase.
based on mapping to UniProt P00459
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.
-!- Composed of two proteins that can be separated but are both required for nitrogenase activity. -!- Dinitrogen reductase is a [4Fe-4S] protein, which, with two molecules of ATP and ferredoxin, generates an electron. -!- The electron is transferred to the other protein, dinitrogenase (molybdoferredoxin). -!- Dinitrogenase is a molybdenum-iron protein that reduces dinitrogen in three succesive two-electron reductions from nitrogen to diimine to hydrazine to two molecules of ammonia; the molybdenum may be replaced by vanadium or iron. -!- 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). -!- Formerly EC 1.18.2.1.
|
UniProtKB Entries (1)
| P00459 |
NIFH1_AZOVI
Azotobacter vinelandii
Nitrogenase iron protein 1
|
PDB Structure
| PDB | 1DE0 |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | |
| Primary Citation |
Modulating the midpoint potential of the [4Fe-4S] cluster of the nitrogenase Fe protein.
Biochemistry
|