| 2016 |
IP6K1 catalytic activity is required for cytoplasmic dynein-driven vesicle transport; IP7 pyrophosphorylates Ser51 of dynein intermediate chain (IC), promoting IC interaction with p150(Glued) subunit of dynactin, and IC recruitment to membranes. Cells lacking IP6K1 show defects in endosomal sorting, vesicle movement, and Golgi maintenance that are reversed by catalytically active but not inactive IP6K1. |
KO cell lines, catalytically inactive mutant rescue, in vitro pyrophosphorylation assay, Co-IP, membrane fractionation, live imaging of vesicle movement |
The Biochemical journal |
High |
27474409
|
| 2016 |
IP6K1 promotes cell migration and actin cytoskeleton remodeling via FAK and Paxillin activation; IP6K1-null MEFs show defects in adhesion-dependent signaling, cell spreading, and migration that are reversed by catalytically active but not inactive IP6K1, indicating 5-IP7 synthesis drives cell locomotion. |
KO MEFs, catalytically inactive mutant rescue, immunoblot for FAK/Paxillin phosphorylation, migration and invasion assays, gene expression analysis |
Cellular signalling |
High |
27140681
|
| 2016 |
IP6K1 regulates adipocyte energy metabolism by suppressing AMPK-mediated thermogenesis; adipocyte-specific deletion of Ip6k1 enhances AMPK activation, UCP1/PGC1α expression, and thermogenic energy expenditure. IP6 and IP6K1 differentially regulate upstream kinase-mediated AMPK stimulatory phosphorylation in vitro. |
Adipocyte-specific KO mice, in vitro kinase assays, immunoblot, UCP1/PGC1α expression, AMPK depletion epistasis, energy expenditure measurement |
The Journal of clinical investigation |
High |
27701146
|
| 2016 |
IP6K1 preferentially binds phosphatidic acid (PA), and this binding is required for IP6K1 nuclear localization and transcriptional repression of myo-inositol-3-phosphate synthase (MIPS/Isyna1), thereby negatively regulating inositol synthesis in mammalian cells. |
Ip6k1 ablation in MEFs, PA-binding assay, subcellular fractionation/nuclear localization, DNA methylation analysis, qRT-PCR for Isyna1 expression |
The Journal of biological chemistry |
High |
26953345
|
| 2022 |
Phosphatidic acid (PA) synthesized at the plasma membrane by phospholipase D (PLD) induces nuclear translocation of IP6K1 and represses MIPS expression. AMPK activates PLD-mediated PA synthesis, linking glucose deprivation or mood-stabilizing drugs (valproate, lithium) to IP6K1 nuclear translocation and MIPS repression. |
Pharmacological PLD stimulation, direct PA supplementation, AMPK activation by glucose deprivation/drugs, nuclear translocation imaging, MIPS immunoblot, organelle-specific PA manipulation |
The Journal of biological chemistry |
High |
35963434
|
| 2019 |
IP6K1 and IP6K2 together control inositol pyrophosphate (IP7/IP8) metabolism; IP6K1/2-knockout HCT116 cells lack IP7/IP8, have elevated intracellular ATP and free phosphate, and show reduced phosphate import and export. Inositol pyrophosphates regulate phosphate export via binding to the SPX domain of the phosphate exporter XPR1. |
CRISPR KO of IP6K1/2, PAGE and HPLC inositol phosphate analysis, nucleotide analysis, Malachite green phosphate assay, [32Pi] pulse labeling, XPR1 SPX-domain binding assay |
The Journal of biological chemistry |
High |
31186349
|
| 2018 |
Platelet IP6K1-mediated inorganic polyphosphate (polyP) production is essential for infection-induced neutrophil-platelet aggregate (NPA) formation; IP6K1 inhibition reduces serum polyP levels, which regulates NPAs via the bradykinin pathway and bradykinin-mediated neutrophil activation, thereby reducing pulmonary neutrophil accumulation. |
Ip6k1 KO mice, pharmacological IP6K1 inhibition (TNP), platelet polyP measurement, NPA flow cytometry, bradykinin pathway analysis, polyphosphate rescue experiment, bacterial pneumonia model |
Science translational medicine |
High |
29618559
|
| 2017 |
IP6K1 is a component of the chromatoid body in round spermatids and is required for its formation; Ip6k1-null spermatids lack chromatoid bodies and show premature translational derepression of TNP2 and PRM2, resulting in abnormal chromatin remodeling, failure of spermatid differentiation, and azoospermia. |
Ip6k1 KO mice, immunofluorescence/localization of IP6K1 to chromatoid body, immunoblot for TNP2/PRM2/histones, spermatogenesis phenotype analysis |
Journal of cell science |
High |
28743739
|
| 2021 |
IP6K1 upregulates processing body (P-body) formation independently of its catalytic activity by binding to ribosomes and interacting with the mRNA decapping complex (EDC4, DCP1A/B, DCP2, DDX6); IP6K1 augments DDX6-4E-T interaction and binding to eIF4E on the 5' mRNA cap, tipping the balance toward translational repression. IP6K1-depleted cells show reduced microRNA-mediated translational suppression and increased stability of DCP2-regulated transcripts. |
IP6K1 KD/KO, Co-IP of decapping complex components, ribosome fractionation, P-body quantification, mRNA stability assays, catalytically inactive mutant analysis |
Journal of cell science |
High |
34841428
|
| 2021 |
IP6K1 interacts with O-GlcNAcase in human NASH liver tissue and its deletion reduces protein O-GlcNAcylation in mouse liver, linking IP6K1 to regulation of protein O-GlcNAc modification in hepatic metabolism. |
Co-immunoprecipitation, mass spectrometry, immunoblot for O-GlcNAcylation in KO vs WT mouse livers and human NASH samples |
Molecular metabolism |
Medium |
34757046
|
| 2017 |
IP6K1 deletion in MSCs results in higher MDM2 and lower p53 protein levels, leading to reduced intrinsic mitochondrial ROS, enhanced osteogenesis and hematopoiesis-supporting activity, and reduced adipogenic differentiation. |
Ip6k1 KO mice, MSC isolation, immunoblot for MDM2/p53, mitochondrial ROS measurement, osteogenic/adipogenic differentiation assays |
Stem cells (Dayton, Ohio) |
Medium |
28577302
|
| 2024 |
IP6K1 forms a complex with AP3B1 and CK2α; IP6K1 interacts with multiple proteins that undergo 5-InsP7-mediated pyrophosphorylation (NOLC1, TCOF, UBF1, AP3B1), and disrupting IP6K1 binding to AP3B1 lowers its in vivo pyrophosphorylation, suggesting IP6K1 acts as a scaffold to coordinate CK2-mediated pre-phosphorylation and subsequent pyrophosphorylation of substrates. |
Mass spectrometry interactome, Co-IP of IP6K1-AP3B1-CK2α complex, in vivo pyrophosphorylation assay with IP6K1-binding mutant |
Bioscience reports |
Medium |
39230924
|
| 2024 |
IP6K1 and its product 5PP-InsP5 bind apoA-I and recruit UBE4A to induce apoA-I ubiquitination and degradation; depleting 5PP-InsP5 by IP6K1 deletion or inhibition disrupts UBE4A-apoA-I interaction, preventing apoA-I degradation and elevating circulating apoA-I, thereby reducing atherosclerosis. |
Co-immunoprecipitation, chemical biology 5PP-InsP5 binding assays, hepatocyte-specific IP6K1 KO mice, apoA-I KO epistasis, Oil Red O/H&E plaque assessment |
Metabolism: clinical and experimental |
High |
39643078
|
| 2025 |
IP6K1 mediates hyperglycemia-induced endothelial senescence by stabilizing LKB1 (disrupting Hsp/Hsc70 and CHIP-mediated LKB1 degradation), which shifts LKB1 signaling from AMPK activation to p53 pathway activation, resulting in p53-dependent senescence; endothelial-specific IP6K1 KO attenuates and overexpression exacerbates this phenotype. |
Co-IP (LKB1-IP6K1, LKB1-Hsp70, LKB1-CHIP, LKB1-p53), endothelial cell-specific KO and overexpression mice, immunoblot for AMPK/p53/senescence markers |
Diabetes |
Medium |
39792359
|
| 2010 |
Recombinant mouse IP6K1 purified from E. coli catalyzes the synthesis of InsP7 (5-IP7) from IP6 in vitro and can pyrophosphorylate protein serine residues in a kinase-independent manner using this product. |
Recombinant protein purification from E. coli, in vitro kinase assay, radiolabeled [32P]-InsP7 production, in vitro protein pyrophosphorylation |
Methods in molecular biology (Clifton, N.J.) |
High |
20645182
|
| 2024 |
Renal IP6K1 and IP6K2 together are required for normal expression and function of Na+/Pi cotransporters NaPi-IIa and NaPi-IIc; renal tubular-specific double KO mice show reduced phosphate uptake into proximal brush border membranes, hypophosphatemia, reduced FGF23, and increased bone resorption despite hypophosphatemia. |
Renal tubular-specific Ip6k1/2 DKO mice, in vitro opossum kidney cell KO, phosphate transport assays, brush border membrane vesicle uptake, FGF23 ELISA, immunoblot for cotransporters |
Journal of the American Society of Nephrology : JASN |
High |
38317282
|
| 2024 |
IP6K1 KO neurons display lower action potential frequency and deepened afterhyperpolarization, consistent with increased Na+/K+-ATPase (NKA) activity resulting from IP6K1-regulated NKA stability (via PI3K p85α autoinhibitory domain pathway). |
Electrophysiology of IP6K1 KO neurons, action potential frequency and afterhyperpolarization measurement |
Molecular brain |
Medium |
38350944
|
| 2025 |
IP6K1 regulates mitochondrial polyphosphate (polyP) levels through 5-InsP7 synthesis; IP6K1 KO mice and cells show significantly reduced mitochondrial polyP, impaired mitochondrial respiration, and reduced membrane potential. Catalytically active but not inactive IP6K1 restores polyP synthesis and membrane potential, while both active and inactive forms rescue mitochondrial respiration, indicating dual catalytic-dependent and independent mechanisms. |
DAPI fluorescence-based polyP assay, mitochondrial fractionation, mitochondrial respiration (Seahorse), membrane potential measurement, KO cells/mice, active vs. inactive IP6K1 rescue |
bioRxivpreprint |
Medium |
bio_10.1101_2025.06.17.659843
|
| 2025 |
IP6K1 interacts with the proteoglycan SDC4 and supports secretory granule biogenesis in gastric chief cells independently of its catalytic activity; IP6K1 KO AGS cells and Ip6k1-/- mice lack pepsinogen C (PGC) and gastric lipase F (LIPF) granules, and PGC granule formation is restored by reintroduction of either active or inactive IP6K1. |
Ip6k1 KO mice, CRISPR/Cas9 KO in AGS cells, Co-IP of IP6K1-SDC4, immunofluorescence of granules, active vs. inactive IP6K1 rescue |
bioRxivpreprint |
Medium |
bio_10.1101_2025.09.17.676719
|
| 2025 |
IP6K1 is a substrate of the Cys-Arg/N-degron pathway under hypoxia; loss of IP6K1 impairs glucose uptake, glycolytic ATP production, mitochondrial morphology, and metabolic adaptation under hypoxic conditions. |
Proteomics/global N-terminal Cys-degron profiling, mutagenesis, IP6K1 KO cells under hypoxia, glucose uptake and ATP production assays, mitochondrial morphology imaging |
bioRxivpreprint |
Low |
bio_10.1101_2025.01.20.633921
|