Biology:Inositol-tetrakisphosphate 1-kinase
| inositol tetrakisphosphate 1-kinase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 2.7.1.134 | ||||||||
| 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 | ||||||||
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In enzymology, an inositol-tetrakisphosphate 1-kinase (EC 2.7.1.134) is an enzyme that catalyzes the chemical reaction
- ATP + 1D-myo-inositol 3,4,5,6-tetrakisphosphate [math]\displaystyle{ \rightleftharpoons }[/math] ADP + 1D-myo-inositol 1,3,4,5,6-pentakisphosphate
Thus, the two substrates of this enzyme are ATP and 1D-myo-inositol 3,4,5,6-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-3,4,5,6-tetrakisphosphate 1-phosphotransferase. Other names in common use include 1D-myo-inositol-tetrakisphosphate 1-kinase, inositol-trisphosphate 6-kinase, 1D-myo-inositol-trisphosphate 6-kinase, ATP:1D-myo-inositol-1,3,4-trisphosphate 6-phosphotransferase, inositol-trisphosphate 5-kinase, 1D-myo-inositol-trisphosphate 5-kinase, and ATP:1D-myo-inositol-1,3,4-trisphosphate 5-phosphotransferase. This enzyme participates in inositol phosphate metabolism and phosphatidylinositol signaling system.
Structural studies
As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes 2ODT, 2Q7D, and 2QB5.
References
- "L-myo-inositol 1,4,5,6-tetrakisphosphate (3-hydroxy)kinase". Biochem. J. 249 (1): 283–92. 1988. doi:10.1042/bj2490283. PMID 2829850.
- "Metabolism of inositol 1,3,4-trisphosphate to a new tetrakisphosphate isomer in angiotensin-stimulated adrenal glomerulosa cells". J. Biol. Chem. 262 (21): 9952–5. 1987. PMID 3497156.
- "Metabolism of D-myo-inositol 1,3,4,5-tetrakisphosphate by rat liver, including the synthesis of a novel isomer of myo-inositol tetrakisphosphate". Biochem. J. 246 (1): 139–47. 1987. doi:10.1042/bj2460139. PMID 2823793.
- 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.
- "Multitasking in signal transduction by a promiscuous human Ins(3,4,5,6)P(4) 1-kinase/Ins(1,3,4)P(3) 5/6-kinase". Biochem. J. 351 (Pt 3): 551–5. 2000. doi:10.1042/0264-6021:3510551. PMID 11042108.
- "Regulation of Ins(3,4,5,6)P(4) signaling by a reversible kinase/phosphatase". Curr. Biol. 12 (6): 477–82. 2002. doi:10.1016/S0960-9822(02)00713-3. PMID 11909533.
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