GTP diphosphokinase
| GTP diphosphokinase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 2.7.6.5 | ||||||||
| CAS no. | 63690-89-1 | ||||||||
| Databases | |||||||||
| BRENDA | enzyme data | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | enzyme entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| Rhea | reactions | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
GTP diphosphokinase (EC 2.7.6.5) is an enzyme that catalyzes the chemical reaction
The enzyme characterised from species of Bacillus converts guanosine triphosphate (GTP) to guanosine 3'-diphosphate 5'-triphosphate by transferring a pyrophosphate group from the cofactor, adenosine triphosphate (ATP), which is converted to adenosine monophosphate (AMP).[1][2]
Nomenclature
This enzyme is a transferase, specifically one transferring two phosphorus-containing groups (diphosphotransferases). The systematic name of this enzyme class is ATP:GTP 3'-diphosphotransferase. Other names in common use include stringent factor, guanosine 3',5'-polyphosphate synthase, GTP pyrophosphokinase, ATP-GTP 3'-diphosphotransferase, guanosine 5',3'-polyphosphate synthetase, (p)ppGpp synthetase I, (p)ppGpp synthetase II, guanosine pentaphosphate synthetase, GPSI, and GPSII.[3]
Structural studies
As of late 2007, 4 structures have been solved for this class of enzymes, with Protein Data Bank accession codes PDB: 1E3H, PDB: 1E3P, PDB: 1VJ7, and PDB: 2BE3.
References
- ↑ Sy J, Akers H (1976). "Purification and properties of guanosine 5', 3'-polyphosphate synthetase from Bacillus brevis". Biochemistry. 15 (20): 4399–403. doi:10.1021/bi00665a008. PMID 184817.
- ↑ Fehr S, Richter D (1981). "Stringent response of Bacillus stearothermophilus: evidence for the existence of two distinct guanosine 3',5'-polyphosphate synthetases". J. Bacteriol. 145 (1): 68–73. doi:10.1128/JB.145.1.68-73.1981. PMC 217245. PMID 6161916.
- ↑ Enzyme 2.7.6.5 at KEGG Pathway Database.