Page last updated: 2024-10-24

inositol tetrakisphosphate 5-kinase activity

Definition

Target type: molecularfunction

Catalysis of the reaction: 1D-myo-inositol 1,3,4,6-tetrakisphosphate + ATP = 1D-myo-inositol 1,3,4,5,6-pentakisphosphate + ADP. [EC:2.7.1.140, MetaCyc:2.7.1.140-RXN]

Inositol tetrakisphosphate 5-kinase (IP4K) activity is a crucial enzymatic function responsible for the phosphorylation of inositol tetrakisphosphate (IP4) at the 5-hydroxyl position, generating inositol pentakisphosphate (IP5). This specific phosphorylation event plays a significant role in cellular signaling pathways, influencing a wide range of biological processes. IP4K activity is tightly regulated by diverse factors, including intracellular calcium levels, protein-protein interactions, and the availability of its substrate, IP4. Its activation triggers a cascade of downstream events, modulating cellular processes like ion channel activity, membrane trafficking, gene expression, and cell growth. Specifically, IP4K activity has been implicated in:

* **Calcium signaling:** IP5, the product of IP4K activity, acts as a second messenger in calcium signaling pathways, contributing to the regulation of calcium release from intracellular stores.
* **Membrane trafficking:** IP4K activity is essential for the proper function of endocytosis and exocytosis, critical processes involved in the uptake and release of molecules by cells.
* **Gene expression:** IP5, produced by IP4K, can interact with transcription factors, influencing gene expression and regulating cellular responses to stimuli.
* **Cell growth and proliferation:** IP4K activity has been linked to the regulation of cell growth and proliferation, contributing to the proper development and maintenance of tissues.

In summary, inositol tetrakisphosphate 5-kinase activity is a vital enzymatic function that, by converting IP4 to IP5, plays a crucial role in a wide range of cellular signaling pathways, impacting key processes like calcium signaling, membrane trafficking, gene expression, and cell growth.'
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Proteins (2)

ProteinDefinitionTaxonomy
Inositol polyphosphate multikinaseAn inositol polyphosphate multikinase that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q8NFU5]Homo sapiens (human)
Inositol polyphosphate multikinaseAn inositol polyphosphate multikinase that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q8NFU5]Homo sapiens (human)

Compounds (15)

CompoundDefinitionClassesRoles
3',4'-dihydroxyflavone3',4'-dihydroxyflavone: inhibitors of arachidonic acid peroxidation
4',6-dihydroxyflavone4',6-dihydroxyflavone : A dihydroxyflavone that is flavone substituted by hydroxy groups at positions 4' and 6.dihydroxyflavone
naringenin(S)-naringenin : The (S)-enantiomer of naringenin.(2S)-flavan-4-one;
naringenin
expectorant;
plant metabolite
eriodictyoleriodictyol : A tetrahydroxyflavanone that is flavanone substituted by hydroxy groups at positions 5, 7, 3' and 4' respectively.

eriodictyol: structure
3'-hydroxyflavanones;
tetrahydroxyflavanone
quercetin7-hydroxyflavonol;
pentahydroxyflavone
antibacterial agent;
antineoplastic agent;
antioxidant;
Aurora kinase inhibitor;
chelator;
EC 1.10.99.2 [ribosyldihydronicotinamide dehydrogenase (quinone)] inhibitor;
geroprotector;
phytoestrogen;
plant metabolite;
protein kinase inhibitor;
radical scavenger
acacetin5,7-dihydroxy-4'-methoxyflavone : A monomethoxyflavone that is the 4'-methyl ether derivative of apigenin.dihydroxyflavone;
monomethoxyflavone
anticonvulsant;
plant metabolite
apigeninChamomile: Common name for several daisy-like plants (MATRICARIA; TRIPLEUROSPERMUM; ANTHEMIS; CHAMAEMELUM) native to Europe and Western Asia, now naturalized in the United States and Australia.trihydroxyflavoneantineoplastic agent;
metabolite
luteolin3'-hydroxyflavonoid;
tetrahydroxyflavone
angiogenesis inhibitor;
anti-inflammatory agent;
antineoplastic agent;
apoptosis inducer;
c-Jun N-terminal kinase inhibitor;
EC 2.3.1.85 (fatty acid synthase) inhibitor;
immunomodulator;
nephroprotective agent;
plant metabolite;
radical scavenger;
vascular endothelial growth factor receptor antagonist
kaempferol7-hydroxyflavonol;
flavonols;
tetrahydroxyflavone
antibacterial agent;
geroprotector;
human blood serum metabolite;
human urinary metabolite;
human xenobiotic metabolite;
plant metabolite
diosmetin3'-hydroxyflavonoid;
monomethoxyflavone;
trihydroxyflavone
angiogenesis inhibitor;
anti-inflammatory agent;
antineoplastic agent;
antioxidant;
apoptosis inducer;
bone density conservation agent;
cardioprotective agent;
plant metabolite;
tropomyosin-related kinase B receptor agonist;
vasodilator agent
genkwaningenkwanin : A monomethoxyflavone that is apigenin in which the hydroxy group at position 7 is methylated.

genkwanin: structure
dihydroxyflavone;
monomethoxyflavone
metabolite
3-methylquercetinisorhamnetin : A monomethoxyflavone that is quercetin in which the hydroxy group at position 3' is replaced by a methoxy group.7-hydroxyflavonol;
monomethoxyflavone;
tetrahydroxyflavone
anticoagulant;
EC 1.14.18.1 (tyrosinase) inhibitor;
metabolite
myricetin7-hydroxyflavonol;
hexahydroxyflavone
antineoplastic agent;
antioxidant;
cyclooxygenase 1 inhibitor;
food component;
geroprotector;
hypoglycemic agent;
plant metabolite
rhamnetinrhamnetin : A monomethoxyflavone that is quercetin methylated at position 7.

rhamnetin: aglycone of xanthorhamnin; from Rhamnus
monomethoxyflavone;
tetrahydroxyflavone
anti-inflammatory agent;
antioxidant;
metabolite
4',7-dihydroxyflavone4',7-dihydroxyflavone : A dihydroxyflavone in which the two hydroxy substituents are located at positions 4' and 7.

4',7-dihydroxyflavone: inducer of nod gene
dihydroxyflavonemetabolite