Protein Variants | Comment | Organism |
---|---|---|
additional information | generation of a transgenic (Tg) mouse line in which IP3K-A is conditionally overexpressed approximately 3fold in the excitatory neurons of forebrain regions, including the hippocampus. The mutant Tg mice show an increase in both presynaptic release probability of evoked responses, along with bigger synaptic vesicle pools, and miniature excitatory postsynaptic current amplitude, although the spine density or the expression levels of the postsynaptic density-related proteins NR2B, synaptotagmin 1, and PSD-95 are not affected. Hippocampal-dependent learning and memory tasks, including novel object recognition and radial arm maze tasks, are partially impaired in Tg mice. (R,S)-3,5-dihydroxyphenylglycine-induced metabotropic glutamate receptor long-term depression is inhibited in Tg mice (mGluR-dependent DHPG-LTD) and this inhibition is dependent on protein kinase C but not on the IP3 receptor. Long-term potentiation and depression dependent on N-methyl-D-aspartate receptor are marginally affected in Tg mice. The CA1 synapse of Tg mouse have greater evoked synaptic transmission efficacy in mutant mice compared too wild-type | Mus musculus |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
actin filament | - |
Mus musculus | 5884 | - |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Mg2+ | required | Mus musculus |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
ATP + 1D-myo-inositol 1,4,5-trisphosphate | Mus musculus | - |
ADP + 1D-myo-inositol 1,3,4,5-tetrakisphosphate | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Mus musculus | Q8R071 | - |
- |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
brain | - |
Mus musculus | - |
forebrain | - |
Mus musculus | - |
hippocampus | - |
Mus musculus | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
ATP + 1D-myo-inositol 1,4,5-trisphosphate | - |
Mus musculus | ADP + 1D-myo-inositol 1,3,4,5-tetrakisphosphate | - |
? |
Synonyms | Comment | Organism |
---|---|---|
inositol 1,4,5-trisphosphate 3-kinase A | - |
Mus musculus |
IP3K-A | - |
Mus musculus |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
ATP | - |
Mus musculus |
General Information | Comment | Organism |
---|---|---|
malfunction | IP3K-A knockout mice exhibit deficits in some forms of hippocampus-dependent learning and synaptic plasticity, such as long-term potentiation in the dentate gyrus synapses of the hippocampus. Enzyme overexpressing mutant Tg mice show an increase in both presynaptic release probability of evoked responses, along with bigger synaptic vesicle pools, and miniature excitatory postsynaptic current amplitude, although the spine density or the expression levels of the postsynaptic density-related proteins NR2B, synaptotagmin 1, and PSD-95 are not affected. Hippocampal-dependent learning and memory tasks, including novel object recognition and radial arm maze tasks, are partially impaired in Tg mice. (R,S)-3,5-dihydroxyphenylglycine-induced metabotropic glutamate receptor long-term depression is inhibited in Tg mice and this inhibition is dependent on protein kinase C but not on the IP3 receptor. Long-term potentiation and depression dependent on N-methyl-D-aspartate receptor are marginally affected in Tg mice. The CA1 synapse of Tg mouse have greater evoked synaptic transmission efficacy in mutant mice compared too wild-type | Mus musculus |
physiological function | inositol 1,4,5-trisphosphate 3-kinase A (IP3K-A) regulates the level of the inositol polyphosphates, inositol trisphosphate (IP3) and inositol tetrakisphosphate to modulate cellular signaling and intracellular calcium homeostasis in the central nervous system. IP3K-A binds to F-actin in an activity-dependent manner and accumulates in dendritic spines, where it is involved in the regulation of synaptic plasticity. Overexpressed IP3K-A plays a role in some forms of hippocampus-dependent learning and memory tasks as well as in synaptic transmission and plasticity by regulating both presynaptic and postsynaptic functions | Mus musculus |