Deep Research
Falcon
(IP6K3-deep-research-falcon.md)
Falcon
(IP6K3-deep-research-falcon.md)The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
Research report: Human IP6K3 (UniProt Q96PC2)βfunctional annotation
Executive summary
IP6K3 (inositol hexakisphosphate kinase 3; EC 2.7.4.21) is a human inositol phosphate kinase that catalyzes pyrophosphate formation on highly phosphorylated inositols, most prominently converting InsP6 (IP6) to 5-InsP7 (5-IP7) and participating in downstream generation of InsP8. Beyond catalysis, evidence indicates IP6K3 also has noncatalytic scaffolding roles (e.g., linking spectrin and adducin in neurons) and can enable protein pyrophosphorylation-based signaling (e.g., dynein intermediate chain Ser51), connecting inositol pyrophosphate metabolism to cytoskeletal organization, neuronal development, and metabolic physiology. The most direct organismal phenotypes come from Ip6k3 knockout mice, which show strong effects in cerebellar Purkinje cell morphology and synaptogenesis and in systemic metabolic regulation and lifespan. (moritoh2016inositolhexakisphosphatekinase pages 1-2, fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 7-10)
1) Target verification (mandatory identity check)
Identity match: Retrieved sources explicitly map IP6K3 β UniProt Q96PC2 in the context of mammalian inositol phosphate kinases, confirming that the target gene symbol IP6K3 matches the UniProt entry provided and that the literature being summarized is aligned with the correct human protein.
- Evidence: a mammalian inositol phosphate kinase structure table lists IP6K3 (UniProt Q96PC2). Publication date: Jan 2026. URL: https://doi.org/10.1002/1873-3468.70280. (wang2026structuralinsightsinto pages 24-28)
No conflicting evidence for an alternative human protein corresponding to Q96PC2 was found in the retrieved corpus. (wang2026structuralinsightsinto pages 24-28)
2) Key concepts and definitions (current understanding)
2.1 Inositol pyrophosphates and IP6Ks
Inositol pyrophosphates are inositol phosphates containing one or more diphosphate (pyrophosphate) groups. In mammals, IP6Ks (IP6K1/2/3) are central enzymes that produce 5-InsP7 (5-IP7) from InsP6 (IP6) and can contribute to production of InsP8 from 1-IP7. (heitmann2023theroleof pages 1-2)
A key mechanistic theme emphasized in recent synthesis is that inositol pyrophosphates can act through:
1) Noncovalent binding to protein targets,
2) Protein pyrophosphorylation (transfer of pyrophosphate to prephosphorylated residues), and
3) Proteinβprotein interactions mediated by the IP6K enzyme itself (scaffolding effects). (heitmann2023theroleof pages 1-2)
2.2 Enzymatic reaction and substrate scope
Across IP6Ks (including IP6K3), the best-supported catalytic reaction is:
- IP6 β 5-IP7 (5-InsP7 / 5-diphosphoinositol pentakisphosphate), and further phosphorylation such as 1-IP7 β InsP8. (heitmann2023theroleof pages 1-2)
A primary study describing IP6K (family) substrate scope notes that the 5-kinase activity can act on multiple highly phosphorylated inositols, including:
- InsP5 β 5-PP-InsP4,
- InsP6 β 5-PP-InsP5 (5-InsP7),
- 1-PP-InsP5 β InsP8. (moritoh2016inositolhexakisphosphatekinase pages 1-2)
Interpretation for functional annotation: while the most discussed physiological product is 5-InsP7, available evidence supports that IP6Ks (and by extension IP6K3 as a family member) can act on a set of densely phosphorylated inositols and can contribute to InsP8 production in appropriate substrate contexts. (moritoh2016inositolhexakisphosphatekinase pages 1-2, heitmann2023theroleof pages 1-2)
3) Cellular localization and expression (where IP6K3 acts)
3.1 Tissue expression (enrichment vs other IP6K isoforms)
IP6K3 is reported to be non-ubiquitous and enriched in specific tissues compared with IP6K1/2. A review of IP6Ks notes that IP6K3 is expressed at higher levels in skeletal muscle, cardiac muscle, and the thyroid, whereas IP6K1/2 are described as more ubiquitous. Publication date: Aug 2023. URL: https://doi.org/10.3390/biom13091317. (heitmann2023theroleof pages 1-2)
A primary metabolism-focused study reports that Ip6k3 mRNA is highest in mouse skeletal muscle (soleus, gastrocnemius) followed by heart, with a similar pattern in humans and additional notable expression in thyroid and brain (region-dependent); it further reports that among inositol kinases, IP6K3 has the highest mRNA expression in human skeletal muscle. Publication date: Aug 2016. URL: https://doi.org/10.1038/srep32072. (moritoh2016inositolhexakisphosphatekinase pages 1-2, moritoh2016inositolhexakisphosphatekinase pages 3-5)
In the CNS, IP6K3 is described as highly expressed in cerebellar Purkinje cells and interneurons, and present in multiple brain regions (cortex, hippocampus, thalamus, hypothalamus). (heitmann2023theroleof pages 11-12)
3.2 Subcellular localization
A GFP-tagged IP6K3 fusion protein localized to both cytoplasm and nucleus in HEK293 cells, consistent with the idea that IP6K3-derived inositol pyrophosphates can affect both cytosolic and nuclear signaling processes. (moritoh2016inositolhexakisphosphatekinase pages 1-2)
In mouse cerebellum, immunostaining supports localization within the molecular layer/Purkinje cell compartment, consistent with Purkinje-cell phenotypes observed in knockout animals. (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 3-4)
4) Molecular mechanisms, pathways, and interaction partners
4.1 IP6K3 as a cytoskeletal/scaffolding regulator (spectrin/adducin)
A key mechanistic finding is that IP6K3 physically associates with the spectrinβadducin cytoskeletal complex and promotes their interaction.
- IP6K3 co-immunoprecipitates with Ξ±/Ξ²-adducin and Ξ±2/Ξ²2-spectrin, and these interactions were reported as specific to IP6K3 (not observed similarly for IP6K1/2 in that study). (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 3-4)
- Importantly, IP6K3βs promotion of spectrinβadducin interaction was reported to be independent of kinase activity, consistent with a noncatalytic scaffolding role (kinase-dead mutant K217A still promotes binding). (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 7-10)
Pathway implication: This positions IP6K3 not only as an enzyme producing 5-InsP7 but also as a structural organizer at the spectrinβactin membrane skeleton in neurons, with downstream impact on dendritic architecture and synapse formation. (fu2015inositolhexakisphosphatekinase3 pages 10-11)
4.2 IP6K3, dynein, and protein pyrophosphorylation in migration/focal adhesion dynamics
A 2023 review summarizes evidence that IP6K3 binds dynein intermediate chain 2 (DIC2) and that IP7 produced by IP6K3 can pyrophosphorylate DIC2 at Ser51, enhancing interaction with p150glued and recruitment of the dynein/dynactin complex to the leading edge of migrating cells; this is integrated into a model linking IP6K-derived inositol pyrophosphates to focal adhesion and cytoskeletal control relevant to neuronal migration. Publication date: Aug 2023. URL: https://doi.org/10.3390/biom13091317. (heitmann2023theroleof pages 7-9)
4.3 Broader IP6K pathway signaling themes (context for IP6K3)
Within the IP6K pathway, IP7 is described as influencing Akt/GSK3 signaling (e.g., competition with PIP3 for Akt binding, and IP6K-associated protein interactions that can affect GSK3 regulation), as well as vesicle trafficking and phosphate homeostasis; although much of this literature is not uniquely IP6K3-specific, it defines the canonical signaling framework within which IP6K3βs tissue-enriched roles occur. (heitmann2023theroleof pages 1-2)
5) Physiological roles and phenotypes (highest-confidence evidence)
5.1 Neurobiology: Purkinje cell development, synaptogenesis, and motor behavior
Ip6k3 knockout mice provide strong evidence that IP6K3 is required for normal cerebellar development and circuit formation.
Key phenotypes and quantitative data include:
- Reduced cerebellar molecular layer width and Purkinje dendritic defects (withered dendritic trees), with reduced Purkinje cell size/volume and reduced spine density. (fu2015inositolhexakisphosphatekinase3 pages 4-7, heitmann2023theroleof pages 11-12, fu2015inositolhexakisphosphatekinase3 media d8e952f3)
- Large synaptic deficits in the cerebellar molecular layer: electron microscopy quantification indicates both symmetric and asymmetric synapses decrease by ~40β50%; immunostaining quantification shows synapse-type-specific reductions of approximately ~40% (GABAergic), ~40% (parallel fiber), and ~50% (climbing fiber) synapses; GABA synapse unit area decreases by ~40%. (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 7-10, fu2015inositolhexakisphosphatekinase3 media d8e952f3)
- Behavioral outcomes consistent with Purkinje dysfunction include impaired motor learning/coordination (e.g., reduced rotarod performance) and gait abnormalities. (heitmann2023theroleof pages 11-12, fu2015inositolhexakisphosphatekinase3 media d8e952f3)
Mechanistic linkage: these phenotypes are consistent with disruption of IP6K3-mediated spectrin/adducin scaffolding in Purkinje cells. (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 7-10)
5.2 Metabolism and aging-related physiology
A primary mouse study indicates that IP6K3 modulates systemic metabolism and lifespan.
Reported phenotypes in Ip6k3β/β mice include:
- Lower blood glucose and reduced circulating insulin,
- Decreased fat mass and lower body weight,
- Increased plasma lactate,
- Enhanced glucose tolerance and improved insulin tolerance,
- Reduced skeletal muscle Pdk4 expression under normal diet conditions,
- Extended lifespan, associated with reduced phosphorylation of cardiac S6 ribosomal protein (a readout often linked to mTORC1/S6K signaling). Publication date: Aug 2016. URL: https://doi.org/10.1038/srep32072. (moritoh2016inositolhexakisphosphatekinase pages 1-2)
The same work also reports that Ip6k3 expression is inducible by metabolic stressors:
- Upregulated by dexamethasone in human myotubes,
- Elevated under diabetic, fasting, and disuse/denervation conditions in mouse skeletal muscle. (moritoh2016inositolhexakisphosphatekinase pages 1-2, moritoh2016inositolhexakisphosphatekinase pages 3-5)
Quantitative context from denervation experiments: denervation caused muscle mass losses of 41% (gastrocnemius) and 22% (soleus) in wild-type mice at the referenced time point; Ip6k3 loss blunted denervation-associated Pdk4 responses. (moritoh2016inositolhexakisphosphatekinase pages 3-5)
6) Recent developments and latest research (prioritizing 2023β2024)
6.1 2023: Consolidated expert synthesis for CNS roles and mechanisms
The 2023 Biomolecules review provides a current synthesis positioning IP6Ks (including IP6K3) as regulators of synaptic vesicle regulation, Akt/GSK3 signaling, neuronal migration, and other processes, and highlights mechanisms including both pyrophosphorylation and proteinβprotein interaction/scaffolding modes. Publication date: Aug 2023. URL: https://doi.org/10.3390/biom13091317. (heitmann2023theroleof pages 1-2)
It also summarizes IP6K3-specific mechanistic evidence connecting IP6K3 to dynein/dynactin recruitment through DIC2 Ser51 pyrophosphorylation (important for migration/cytoskeletal dynamics). (heitmann2023theroleof pages 7-9)
6.2 2024: Translational cardiac protection via depleting 5-InsP7 (pathway-level relevance)
A 2024 Cardiovascular Research study identifies 5-InsP7 as a physiological regulator of adiponectin handling and demonstrates that reducing 5-InsP7 biosynthesis (genetically via IP6K1 deletion or pharmacologically using an IP6K inhibitor) protects against myocardial ischemiaβreperfusion injury in mice. Publication date: Jan 2024. URL: https://doi.org/10.1093/cvr/cvae017. (fu2024depletinginositolpyrophosphate pages 1-2)
Although this study is primarily centered on IP6K1 (not IP6K3), it is a key 2024 example of real-world pathway manipulation (IP6K inhibition / 5-InsP7 depletion) with clear in vivo implementation details (30 min LAD occlusion, 24 h reperfusion; TTC/Evans blue infarct assessment; TNP inhibitor use; adiponectin dependence). (fu2024depletinginositolpyrophosphate pages 2-3)
7) Current applications and real-world implementations
7.1 Chemical biology and translational pharmacology (IP6K pathway)
Small-molecule inhibition of IP6Ks is actively used as:
- a research tool to modulate cellular inositol pyrophosphate pools, and
- a candidate therapeutic strategy in metabolic and cardiovascular contexts.
A representative high-quality medicinal chemistry study (J. Med. Chem., Apr 2022) reports UNC7467 (compound 20) with quantitative isoform activity:
- IP6K1 IC50 8.9 nM, IP6K2 IC50 4.9 nM, and IP6K3 IC50 1320 nM (weak on IP6K3), demonstrating that isoform selectivity is feasible. URL: https://doi.org/10.1021/acs.jmedchem.2c00220. (zhou2022developmentofnovel pages 1-3)
In-cell target engagement: in HCT116 inositol phosphate profiling, UNC7467 reduced inositol pyrophosphates by 66β81% while not significantly perturbing other inositol phosphates. (zhou2022developmentofnovel pages 1-3)
In vivo implementation: intraperitoneal dosing of UNC7467 in diet-induced obese mice improved glycemic profiles, reduced weight gain, and ameliorated hepatic steatosis without altering food intake (reported as translational metabolic benefit; specific effect sizes are not in the excerpt). (zhou2022developmentofnovel pages 1-3)
A 2023 inhibitor-development dissertation describes strategies toward BBB-penetrant inhibitors (e.g., replacing carboxylic acids with neutral isosteres) and reports a lead compound with IC50 15 nM and an βexcellent brain/plasma ratio,β along with early PROTAC development to dissect enzymatic vs scaffolding roles. (heitmann2023strategiestowardinhibition pages 1-6)
7.2 Genetic models as βreal-worldβ experimental implementations
For IP6K3 specifically, knockout mouse lines represent the most definitive functional implementation for annotation:
- CNS circuit development and motor behavior phenotyping with quantifiable synaptic and morphological outcomes. (fu2015inositolhexakisphosphatekinase3 media d8e952f3)
- Metabolic phenotyping across glucose/insulin, body composition, and lifespan. (moritoh2016inositolhexakisphosphatekinase pages 1-2)
8) Relevant statistics and quantitative data (from available studies)
Key quantitative findings accessible in the retrieved evidence include:
Neurodevelopment/synapses (Ip6k3 KO):
- Total synapses reduced by ~40β50% in cerebellar molecular layer (EM quantification). (fu2015inositolhexakisphosphatekinase3 media d8e952f3)
- Synapse subtype reductions: ~40% GABAergic, ~40% parallel fiber, ~50% climbing fiber; GABA synapse unit area reduced by ~40%. (fu2015inositolhexakisphosphatekinase3 pages 7-10, fu2015inositolhexakisphosphatekinase3 media d8e952f3)
Chemical probe activity (UNC7467):
- Biochemical potency/selectivity: IP6K1 8.9 nM, IP6K2 4.9 nM, IP6K3 1320 nM. (zhou2022developmentofnovel pages 1-3)
- Cellular target engagement: 66β81% reduction in inositol pyrophosphates (HCT116 profiling). (zhou2022developmentofnovel pages 1-3)
Muscle stress context (denervation):
- Denervation-induced mass losses in WT: 41% gastrocnemius, 22% soleus (time point noted in the excerpt), with Ip6k3 affecting downstream metabolic gene responses (Pdk4). (moritoh2016inositolhexakisphosphatekinase pages 3-5)
Limitations: the 2024 cardiac I/R paper excerpt provides detailed protocols but not explicit numeric infarct-size reduction or percent 5-InsP7 depletion in the excerpted sections. (fu2024depletinginositolpyrophosphate pages 2-3)
9) Disease associations and clinical relevance (evidence strength)
Direct human genetics/disease associations for IP6K3 were limited in the retrieved excerpts. A 2023 review notes an exploratory human SNP study reporting two promoter-region SNPs associated with a late-onset phenotype (details not fully accessible in excerpt). (heitmann2023theroleof pages 11-12)
Pathway-level disease relevance: robust evidence supports that manipulating IP6K-generated 5-InsP7 can influence metabolic and cardiovascular outcomes (e.g., 2024 myocardial I/R protection via IP6K inhibition), but this is not uniquely attributable to IP6K3. (fu2024depletinginositolpyrophosphate pages 1-2, fu2024depletinginositolpyrophosphate pages 2-3)
10) Conclusions (functional annotation statement)
Human IP6K3 (UniProt Q96PC2) is best annotated as a tissue-enriched inositol hexakisphosphate kinase that produces inositol pyrophosphate signals (notably 5-InsP7) and participates in pyrophosphate-dependent signaling mechanisms, including protein pyrophosphorylation. In the CNSβespecially cerebellar Purkinje cellsβevidence indicates IP6K3 has a major role in neuronal morphology and synapse formation, mediated at least in part by noncatalytic scaffolding interactions with the spectrinβadducin cytoskeleton; knockout phenotypes include large (β40β50%) synapse losses and motor-learning deficits. In metabolic tissues (skeletal and cardiac muscle), IP6K3 expression is inducible by metabolic stress, and genetic deletion in mice impacts systemic glucose/insulin homeostasis and lifespan, linking IP6K3 biology to nutrient and aging-related physiology. (moritoh2016inositolhexakisphosphatekinase pages 1-2, fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 media d8e952f3)
Summary table
| Category | Key findings | Best supporting citations |
|---|---|---|
| Identity | Human IP6K3 corresponds to UniProt Q96PC2; literature and kinase tables explicitly map IP6K3 β Q96PC2. It is one of the mammalian inositol hexakisphosphate kinases within the broader inositol phosphate kinase pathway; no conflicting human target identity was found in the retrieved evidence. | 2026 FEBS Lett. table linking IP6K3 to Q96PC2: https://doi.org/10.1002/1873-3468.70280 (wang2026structuralinsightsinto pages 24-28); 2023 Biomolecules review on IP6Ks: https://doi.org/10.3390/biom13091317 (heitmann2023theroleof pages 1-2) |
| Enzymatic reaction | IP6K3 is an inositol hexakisphosphate kinase that synthesizes inositol pyrophosphates. Current consensus is that IP6Ks convert IP6 β 5-IP7 (5-InsP7) and can further phosphorylate 1-IP7 β IP8. | 2023 Biomolecules review: https://doi.org/10.3390/biom13091317 (heitmann2023theroleof pages 1-2); 2016 Sci Rep: https://doi.org/10.1038/srep32072 (moritoh2016inositolhexakisphosphatekinase pages 1-2) |
| Substrate specificity | Reported IP6K 5-kinase activity includes pyrophosphorylation of InsP5 β 5-PP-InsP4, InsP6 β 5-PP-InsP5 (5-InsP7), and 1-PP-InsP5 β InsP8; thus IP6K3 shares family substrate scope for highly phosphorylated inositols, with best-established physiological product 5-InsP7. | 2016 Sci Rep: https://doi.org/10.1038/srep32072 (moritoh2016inositolhexakisphosphatekinase pages 1-2); 2023 Biomolecules review: https://doi.org/10.3390/biom13091317 (heitmann2023theroleof pages 1-2) |
| Localization & expression | Expression is enriched relative to IP6K1/2 in skeletal muscle, cardiac muscle/heart, thyroid, and brain/cerebellum; in brain, IP6K3 is highly expressed in Purkinje cells and also interneurons. In HEK293 cells, GFP-IP6K3 localizes to both cytoplasm and nucleus. In cerebellum it localizes to the molecular layer/Purkinje cells by immunostaining. | 2016 Sci Rep: https://doi.org/10.1038/srep32072 (moritoh2016inositolhexakisphosphatekinase pages 1-2); 2023 Biomolecules review: https://doi.org/10.3390/biom13091317 (heitmann2023theroleof pages 1-2, heitmann2023theroleof pages 11-12); 2015 J Neurosci: https://doi.org/10.1523/JNEUROSCI.1069-15.2015 (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 3-4) |
| Interaction partners | IP6K3 has noncatalytic scaffolding interactions with adducins and spectrins; it co-immunoprecipitates with Ξ±/Ξ²-adducin and Ξ±2/Ξ²2-spectrin, and this interaction is specific to IP6K3 versus IP6K1/2 in the cited study. It also binds dynein intermediate chain 2 (DIC2); IP7 produced by IP6K3 pyrophosphorylates DIC2 Ser51, promoting interaction with p150glued and recruitment of the dynactin/dynein complex at the leading edge. | 2015 J Neurosci: https://doi.org/10.1523/JNEUROSCI.1069-15.2015 (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 7-10, fu2015inositolhexakisphosphatekinase3 pages 3-4, fu2015inositolhexakisphosphatekinase3 pages 10-11); 2023 Biomolecules review: https://doi.org/10.3390/biom13091317 (heitmann2023theroleof pages 7-9) |
| Physiological roles & phenotypes | Metabolic/aging: Ip6k3 deletion in mice lowered blood glucose, circulating insulin, fat mass, and body weight; increased plasma lactate; improved glucose tolerance/insulin tolerance; reduced muscle Pdk4; and extended lifespan with reduced cardiac S6 ribosomal protein phosphorylation. Neurobiology: IP6K3 KO mice show decreased cerebellar molecular layer width, withered Purkinje dendrites, reduced Purkinje cell size/volume and spine density, impaired neuronal migration, and motor-learning/gait deficits. Quantitatively, total synapse number in cerebellum falls by about 40β50%; specific synapses are reduced by about 40% GABAergic, 40% parallel fiber, and ~50% climbing fiber; GABA synapse unit area is reduced by about 40%. | 2016 Sci Rep: https://doi.org/10.1038/srep32072 (moritoh2016inositolhexakisphosphatekinase pages 1-2); 2015 J Neurosci: https://doi.org/10.1523/JNEUROSCI.1069-15.2015 (fu2015inositolhexakisphosphatekinase3 pages 4-7, fu2015inositolhexakisphosphatekinase3 pages 7-10, heitmann2023theroleof pages 11-12, fu2015inositolhexakisphosphatekinase3 media d8e952f3) |
| Therapeutic targeting & inhibitors | No IP6K3-selective therapy is established clinically, but the IP6K pathway is actively pursued pharmacologically. A 2022 probe UNC7467 inhibited IP6K1 8.9 nM, IP6K2 4.9 nM, but was much weaker on IP6K3 1320 nM, showing that isoform selectivity is achievable; in cells it reduced inositol pyrophosphates by 66β81% and improved obesity-linked metabolic phenotypes in mice. A 2023 medicinal-chemistry effort reported a brain-penetrant lead with IC50 15 nM and favorable brain/plasma exposure. A 2026 review summarized SC-919 as highly potent with reported IC50s <5.2 nM (IP6K1), <3.8 nM (IP6K2), 0.65 nM (IP6K3), though this is outside the user's 2023β2024 priority window. Translational 2024 work supports IP6K inhibition/5-InsP7 depletion for cardioprotection in myocardial ischemiaβreperfusion injury, but that study was primarily IP6K1-centered, not IP6K3-specific. | 2022 J Med Chem: https://doi.org/10.1021/acs.jmedchem.2c00220 (zhou2022developmentofnovel pages 1-3); 2023 inhibitor thesis summary (heitmann2023strategiestowardinhibition pages 1-6); 2024 Cardiovasc Res: https://doi.org/10.1093/cvr/cvae017 (fu2024depletinginositolpyrophosphate pages 2-3, fu2024depletinginositolpyrophosphate pages 1-2); 2026 FEBS Lett. review for SC-919 values: https://doi.org/10.1002/1873-3468.70280 (wang2026structuralinsightsinto pages 7-8) |
Table: This table summarizes the verified identity, enzymatic activity, localization, interaction partners, phenotypes, and therapeutic context for human IP6K3 (UniProt Q96PC2). It emphasizes experimentally supported findings and includes quantitative values and source-linked citations where available.
References
-
(moritoh2016inositolhexakisphosphatekinase pages 1-2): Yusuke Moritoh, Masahiro Oka, Yoshitaka Yasuhara, Hiroyuki Hozumi, Kimihiko Iwachidow, Hiromitsu Fuse, and Ryuichi Tozawa. Inositol hexakisphosphate kinase 3 regulates metabolism and lifespan in mice. Scientific Reports, Aug 2016. URL: https://doi.org/10.1038/srep32072, doi:10.1038/srep32072. This article has 78 citations and is from a peer-reviewed journal.
-
(fu2015inositolhexakisphosphatekinase3 pages 4-7): C. Fu, J. Xu, R.-J. Li, J. A. Crawford, A. B. Khan, T. M. Ma, J. Y. Cha, A. M. Snowman, M. V. Pletnikov, and S. H. Snyder. Inositol hexakisphosphate kinase-3 regulates the morphology and synapse formation of cerebellar purkinje cells via spectrin/adducin. The Journal of Neuroscience, 35:11056-11067, Aug 2015. URL: https://doi.org/10.1523/jneurosci.1069-15.2015, doi:10.1523/jneurosci.1069-15.2015. This article has 60 citations.
-
(fu2015inositolhexakisphosphatekinase3 pages 7-10): C. Fu, J. Xu, R.-J. Li, J. A. Crawford, A. B. Khan, T. M. Ma, J. Y. Cha, A. M. Snowman, M. V. Pletnikov, and S. H. Snyder. Inositol hexakisphosphate kinase-3 regulates the morphology and synapse formation of cerebellar purkinje cells via spectrin/adducin. The Journal of Neuroscience, 35:11056-11067, Aug 2015. URL: https://doi.org/10.1523/jneurosci.1069-15.2015, doi:10.1523/jneurosci.1069-15.2015. This article has 60 citations.
-
(wang2026structuralinsightsinto pages 24-28): Huanchen Wang. Structural insights into the development of inhibitors for inositol phosphate kinases. FEBS Letters, Jan 2026. URL: https://doi.org/10.1002/1873-3468.70280, doi:10.1002/1873-3468.70280. This article has 0 citations and is from a peer-reviewed journal.
-
(heitmann2023theroleof pages 1-2): Tyler Heitmann and James C. Barrow. The role of inositol hexakisphosphate kinase in the central nervous system. Biomolecules, 13:1317, Aug 2023. URL: https://doi.org/10.3390/biom13091317, doi:10.3390/biom13091317. This article has 10 citations.
-
(moritoh2016inositolhexakisphosphatekinase pages 3-5): Yusuke Moritoh, Masahiro Oka, Yoshitaka Yasuhara, Hiroyuki Hozumi, Kimihiko Iwachidow, Hiromitsu Fuse, and Ryuichi Tozawa. Inositol hexakisphosphate kinase 3 regulates metabolism and lifespan in mice. Scientific Reports, Aug 2016. URL: https://doi.org/10.1038/srep32072, doi:10.1038/srep32072. This article has 78 citations and is from a peer-reviewed journal.
-
(heitmann2023theroleof pages 11-12): Tyler Heitmann and James C. Barrow. The role of inositol hexakisphosphate kinase in the central nervous system. Biomolecules, 13:1317, Aug 2023. URL: https://doi.org/10.3390/biom13091317, doi:10.3390/biom13091317. This article has 10 citations.
-
(fu2015inositolhexakisphosphatekinase3 pages 3-4): C. Fu, J. Xu, R.-J. Li, J. A. Crawford, A. B. Khan, T. M. Ma, J. Y. Cha, A. M. Snowman, M. V. Pletnikov, and S. H. Snyder. Inositol hexakisphosphate kinase-3 regulates the morphology and synapse formation of cerebellar purkinje cells via spectrin/adducin. The Journal of Neuroscience, 35:11056-11067, Aug 2015. URL: https://doi.org/10.1523/jneurosci.1069-15.2015, doi:10.1523/jneurosci.1069-15.2015. This article has 60 citations.
-
(fu2015inositolhexakisphosphatekinase3 pages 10-11): C. Fu, J. Xu, R.-J. Li, J. A. Crawford, A. B. Khan, T. M. Ma, J. Y. Cha, A. M. Snowman, M. V. Pletnikov, and S. H. Snyder. Inositol hexakisphosphate kinase-3 regulates the morphology and synapse formation of cerebellar purkinje cells via spectrin/adducin. The Journal of Neuroscience, 35:11056-11067, Aug 2015. URL: https://doi.org/10.1523/jneurosci.1069-15.2015, doi:10.1523/jneurosci.1069-15.2015. This article has 60 citations.
-
(heitmann2023theroleof pages 7-9): Tyler Heitmann and James C. Barrow. The role of inositol hexakisphosphate kinase in the central nervous system. Biomolecules, 13:1317, Aug 2023. URL: https://doi.org/10.3390/biom13091317, doi:10.3390/biom13091317. This article has 10 citations.
-
(fu2015inositolhexakisphosphatekinase3 media d8e952f3): C. Fu, J. Xu, R.-J. Li, J. A. Crawford, A. B. Khan, T. M. Ma, J. Y. Cha, A. M. Snowman, M. V. Pletnikov, and S. H. Snyder. Inositol hexakisphosphate kinase-3 regulates the morphology and synapse formation of cerebellar purkinje cells via spectrin/adducin. The Journal of Neuroscience, 35:11056-11067, Aug 2015. URL: https://doi.org/10.1523/jneurosci.1069-15.2015, doi:10.1523/jneurosci.1069-15.2015. This article has 60 citations.
-
(fu2024depletinginositolpyrophosphate pages 1-2): Lin Fu, Jimin Du, David Furkert, Megan L Shipton, Xiaoqi Liu, Tim Aguirre, Alfred C Chin, Andrew M Riley, Barry V L Potter, Dorothea Fiedler, Xu Zhang, Yi Zhu, and Chenglai Fu. Depleting inositol pyrophosphate 5-insp7 protected the heart against ischaemiaβreperfusion injury by elevating plasma adiponectin. Cardiovascular Research, 120:954-970, Jan 2024. URL: https://doi.org/10.1093/cvr/cvae017, doi:10.1093/cvr/cvae017. This article has 10 citations and is from a domain leading peer-reviewed journal.
-
(fu2024depletinginositolpyrophosphate pages 2-3): Lin Fu, Jimin Du, David Furkert, Megan L Shipton, Xiaoqi Liu, Tim Aguirre, Alfred C Chin, Andrew M Riley, Barry V L Potter, Dorothea Fiedler, Xu Zhang, Yi Zhu, and Chenglai Fu. Depleting inositol pyrophosphate 5-insp7 protected the heart against ischaemiaβreperfusion injury by elevating plasma adiponectin. Cardiovascular Research, 120:954-970, Jan 2024. URL: https://doi.org/10.1093/cvr/cvae017, doi:10.1093/cvr/cvae017. This article has 10 citations and is from a domain leading peer-reviewed journal.
-
(zhou2022developmentofnovel pages 1-3): Yubai Zhou, Sandip Mukherjee, Daowei Huang, Molee Chakraborty, Chunfang Gu, Guangning Zong, Michael A. Stashko, Kenneth H. Pearce, Stephen B. Shears, Anutosh Chakraborty, Huanchen Wang, and Xiaodong Wang. Development of novel ip6k inhibitors for the treatment of obesity and obesity-induced metabolic dysfunctions. Journal of medicinal chemistry, 65:6869-6887, Apr 2022. URL: https://doi.org/10.1021/acs.jmedchem.2c00220, doi:10.1021/acs.jmedchem.2c00220. This article has 32 citations and is from a highest quality peer-reviewed journal.
-
(heitmann2023strategiestowardinhibition pages 1-6): TE Heitmann. Strategies toward inhibition of inositol hexakisphosphate kinase. Unknown journal, 2023.
-
(wang2026structuralinsightsinto pages 7-8): Huanchen Wang. Structural insights into the development of inhibitors for inositol phosphate kinases. FEBS Letters, Jan 2026. URL: https://doi.org/10.1002/1873-3468.70280, doi:10.1002/1873-3468.70280. This article has 0 citations and is from a peer-reviewed journal.
Artifacts
Citations
- wang2026structuralinsightsinto pages 24-28
- heitmann2023theroleof pages 1-2
- moritoh2016inositolhexakisphosphatekinase pages 1-2
- heitmann2023theroleof pages 11-12
- heitmann2023theroleof pages 7-9
- moritoh2016inositolhexakisphosphatekinase pages 3-5
- fu2024depletinginositolpyrophosphate pages 1-2
- fu2024depletinginositolpyrophosphate pages 2-3
- zhou2022developmentofnovel pages 1-3
- heitmann2023strategiestowardinhibition pages 1-6
- wang2026structuralinsightsinto pages 7-8
- https://doi.org/10.1002/1873-3468.70280.
- https://doi.org/10.3390/biom13091317.
- https://doi.org/10.1038/srep32072.
- https://doi.org/10.1093/cvr/cvae017.
- https://doi.org/10.1021/acs.jmedchem.2c00220.
- https://doi.org/10.1002/1873-3468.70280
- https://doi.org/10.3390/biom13091317
- https://doi.org/10.1038/srep32072
- https://doi.org/10.1523/JNEUROSCI.1069-15.2015
- https://doi.org/10.1021/acs.jmedchem.2c00220
- https://doi.org/10.1093/cvr/cvae017
- https://doi.org/10.1038/srep32072,
- https://doi.org/10.1523/jneurosci.1069-15.2015,
- https://doi.org/10.1002/1873-3468.70280,
- https://doi.org/10.3390/biom13091317,
- https://doi.org/10.1093/cvr/cvae017,
- https://doi.org/10.1021/acs.jmedchem.2c00220,
Manual
(IP6K3-deep-research-manual.md)
Manual
(IP6K3-deep-research-manual.md)IP6K3 manual deep research notes
Falcon deep research was attempted repeatedly for this gene but did not return a report. These manual notes are based only on cached repository sources and are intended to document the provenance used for the review.
Sources checked
- UniProt record:
genes/human/IP6K3/IP6K3-uniprot.txt - GOA file:
genes/human/IP6K3/IP6K3-goa.tsv - Cached publication abstract:
publications/PMID_11502751.md - Reactome records including
reactome/R-HSA-1855227.mdandreactome/R-HSA-1855167.md
Findings
- IP6K3 is the human inositol hexakisphosphate kinase 3 gene product, also listed as IHPK3 in UniProt.
- The cached PMID:11502751 abstract reports the identification, cloning, and characterization of a third InsP7-forming enzyme designated InsP(6)K3.
- PMID:11502751 reports that InsP(6)K3 is enriched in brain and predominates in the cytoplasm, whereas InsP(6)K2 is exclusively nuclear and InsP(6)K1 has comparable nuclear and cytosolic densities.
- UniProt describes the curated function as conversion of inositol hexakisphosphate (InsP6) to diphosphoinositol pentakisphosphate (InsP7/PP-InsP5), and conversion of InsP5 to PP-InsP4.
- Reactome R-HSA-1855227 describes IP6K1 and IP6K3 phosphorylating IP6 to 5-PP-IP5 in the cytosol.
- The available curated function, PMID:11502751 abstract, and Reactome pathway context support soluble inositol phosphate and inositol pyrophosphate metabolism, not phosphatidylinositol lipid metabolism as a core process.
- The available reviewed function text and the PMID:11502751 abstract support inositol phosphate kinase activity. They do not provide evidence that IP6K3 directly phosphorylates protein substrates, so protein phosphorylation should not be kept as a supported core biological process in this review.