EC Number   |
General Information |
Reference |
|---|
   2.7.1.159 | malfunction |
although both ipk1-1 and itpk1 mutants exhibit decreased levels of InsP6 (phytate) and diphosphoinositol pentakisphosphate (PP-InsP5, InsP7), disruption of another ITPK family enzyme, ITPK4, which correspondingly causes depletion of InsP6 and InsP7, does not display similar phosphate-related phenotypes, which precludes these InsP species from being effectors. Notably, the level of D/L-Ins(3,4,5,6)P4 is concurrently elevated in both ipk1-1 and itpk1 mutants, which demonstrates a specific correlation with the misregulated phosphate phenotypes. The level of D/L-Ins(3,4,5,6)P4 is not responsive to phosphate starvation that instead manifests a shoot-specific increase in the InsP7 level. ITPK1 overexpression significantly decreases phosphate uptake activity, in contrast to the elevated uptake activity shown by itpk1 mutants. In addition, several PSR genes are downregulated in ITPK1-overexpressing lines compared with the wild-type (e.g. PHT1:2, SPX1, AT4, IPS1 and PAP17) |
762144 |
| 2.7.1.159 | more |
enzyme homology-based modeling and structure comparisons, overview. Active site mapping and molecular docking with ATP |
760244 |
| 2.7.1.159 | physiological function |
enzyme ITPK is the key regulatory enzyme at the branch point for the synthesis of InsP4 isomers [e.g. Ins(1,3,4,5)P4, Ins(1,3,4,6)P4 and Ins(3,4,5,6)P4], inositol pentakisphosphate (InsP5) and inositol hexaphosphate (InsP6). Ins (3,4,5,6)P4 can act as second messenger and play important roles in signal transduction |
760793 |
| 2.7.1.159 | physiological function |
enzyme ITPK2 plays an essential role in seed coat development and lipid polyester barrier formation |
737332 |
| 2.7.1.159 | metabolism |
following the formation of myo-inositol-3-phosphate, sequential phosphorylation reactions via action of various inositol phosphate kinases-myo-inositol kinase (Mik), inositol 1,3,4-trisphosphate kinase (Itpk), inositol 1,4,5-trisphosphate 3/6 kinase (Ipk2), and inositol 1,3,4,5,6-pentakisphosphate kinase (Ipk1) lead to phytic acid (PA, myo-inositol 1,2,3,4,5,6-hexakisphosphate) synthesis via the lipid-independent pathway and fine-tune the phosphorous flux towards PA accumulation |
760244 |
| 2.7.1.159 | physiological function |
inositol 1,3,4, trisphosphate 5/6 kinase (ITPK), a polyphosphate kinase that converts inositol 1,3,4-trisphosphate to inositol 1,3,4,5/6-tetraphosphate, averting the inositol phosphate pool towards phytic acid (PA) biosynthesis, is a key regulator that exists in four different isoforms in soybean. Role of inositol 1,3,4-trisphosphate 5/6 kinase-2 (GmITPK2) as a dehydration and salinity stress regulator in Glycine max. The significantly higher expression of GmITPK2 under drought and salinity stress suggests its role in providing tolerance mechanism against abiotic stress |
762167 |
| 2.7.1.159 | physiological function |
inositol 1,3,4-trisphosphate kinase-2 (GmItpk2), catalyzing the ATP-dependent phosphorylation of inositol 1,3,4-trisphosphate (IP3) to inositol 1,3,4,5-tetraphosphate or inositol 1,3,4,6-tetraphosphate, is a key enzyme diverting the flux of inositol phosphate pool towards phytate biosynthesis |
760244 |
| 2.7.1.159 | malfunction |
loss of this gene in itpk3-1 does neither affect phytate seed levels, nor seed Zn, Fe, and Mn but the micronutrient bioavailability is strongly reduced by seed phytate that forms complexes with seed cations. Low seed zinc is primarily caused by plant growth in Zn-deficient soil |
-, 738303 |
| 2.7.1.159 | metabolism |
measurement of Fe, Zn, and Mn concentrations in seeds of Arabidopsis thaliana accessions grown in Zn-deficient and Zn-amended conditions, overview. Inositol 1,3,4-trisphosphate 5/6-kinase 3 gene (ITPK3), located close to a significant nucleotide polymorphism associated with relative Zn seed concentrations, is dispensable for seed micronutrients accumulation in ecotype Col-0 |
-, 738303 |
| 2.7.1.159 | malfunction |
mutation of OsITPK6 not only significantly reduces the accumulation of IP6 in rice grains but also impairs plant growth and tolerance to abiotic stress. Nucleotide substitutions of gene OsITPK6 can significantly lower the phytic acid content in rice grains. Impact of ositpk6 mutations on plant growth and seed germination, panicle phenotype of mutant OsITPK6 and wild-type plants, overview. There is no significant difference in the number of leaves and roots with or without stress treatment between ositpk6_1 and wild-type |
762188 |
