In enzymology, an inositol-tetrakisphosphate 5-kinase (EC 2.7.1.140) is an enzyme that catalyzes the chemical reaction
| inositol tetrakisphosphate 5-kinase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 2.7.1.140 | ||||||||
| CAS no. | 123940-40-9 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
- ATP + 1D-myo-inositol 1,3,4,6-tetrakisphosphate ADP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate
Thus, the two substrates of this enzyme are ATP and 1D-myo-inositol 1,3,4,6-tetrakisphosphate, whereas its two products are ADP and 1D-myo-inositol 1,3,4,5,6-pentakisphosphate.
This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:1D-myo-inositol-1,3,4,6-tetrakisphosphate 5-phosphotransferase. This enzyme is also called 1D-myo-inositol-tetrakisphosphate 5-kinase. This enzyme participates in inositol phosphate metabolism and phosphatidylinositol signaling system.
References
edit- Shears SB (1989). "The pathway of myo-inositol 1,3,4-trisphosphate phosphorylation in liver. Identification of myo-inositol 1,3,4-trisphosphate 6-kinase, myo-inositol 1,3,4-trisphosphate 5-kinase, and myo-inositol 1,3,4,6-tetrakisphosphate 5-kinase". J. Biol. Chem. 264 (33): 19879–86. PMID 2584198.
- Stevenson-Paulik J, Odom AR, York JD (2002). "Molecular and biochemical characterization of two plant inositol polyphosphate 6-/3-/5-kinases". J. Biol. Chem. 277 (45): 42711–8. doi:10.1074/jbc.M209112200. PMID 12226109.
