Tbio ITPK1 Inositol-tetrakisphosphate 1-kinase

Protein Summary

Description

Kinase that can phosphorylate various inositol polyphosphate such as Ins(3,4,5,6)P4 or Ins(1,3,4)P3. Phosphorylates Ins(3,4,5,6)P4 at position 1 to form Ins(1,3,4,5,6)P5. This reaction is thought to have regulatory importance, since Ins(3,4,5,6)P4 is an inhibitor of plasma membrane Ca(2+)-activated Cl(-) channels, while Ins(1,3,4,5,6)P5 is not. Also phosphorylates Ins(1,3,4)P3 on O-5 and O-6 to form Ins(1,3,4,6)P4, an essential molecule in the hexakisphosphate (InsP6) pathway. Also acts as an inositol polyphosphate phosphatase that dephosphorylate Ins(1,3,4,5)P4 and Ins(1,3,4,6)P4 to Ins(1,3,4)P3, and Ins(1,3,4,5,6)P5 to Ins(3,4,5,6)P4. May also act as an isomerase that interconverts the inositol tetrakisphosphate isomers Ins(1,3,4,5)P4 and Ins(1,3,4,6)P4 in the presence of ADP and magnesium. Probably acts as the rate-limiting enzyme of the InsP6 pathway. Modifies TNF-alpha-induced apoptosis by interfering with the activation of TNFRSF1A-associated death domain (PubMed:11909533, PubMed:12925536, PubMed:17616525). Plays an important role in MLKL-mediated necroptosis. Produces highly phosphorylated inositol phosphates such as inositolhexakisphosphate (InsP6) which bind to MLKL mediating the release of an N-terminal auto-inhibitory region leading to its activation. Essential for activated phospho-MLKL to oligomerize and localize to the cell membrane during necroptosis (PubMed:17616525). This gene encodes an enzyme that belongs to the inositol 1,3,4-trisphosphate 5/6-kinase family. This enzyme regulates the synthesis of inositol tetraphosphate, and downstream products, inositol pentakisphosphate and inositol hexakisphosphate. Inositol metabolism plays a role in the development of the neural tube. Disruptions in this gene are thought to be associated with neural tube defects. A pseudogene of this gene has been identified on chromosome X. [provided by RefSeq, Jul 2016]

Uniprot Accession IDs

• Q13572
• Q9BTL6
• Q9H2E7

Gene Name

• ITPK1

Ensembl ID

• ENST00000267615
• ENSP00000267615
• ENSG00000100605
• ENST00000354313
• ENSP00000346272
• ENST00000556603
• ENSP00000451091
• ENST00000614271
• ENSP00000483767
• ENSG00000274958
• ENST00000617836
• ENSP00000480918
• ENST00000626153
• ENSP00000486991

Symbol

• ITRPK1

Knowledge Table

Most Knowledge About	Knowledge Value (0 to 1 scale)
molecular function	1
disease perturbation	0.99
trait	0.99
interacting protein	0.94
PubMedID	0.86

Protein Classes

DTO Classes

Protein / Kinase / Non-protein Kinase / Lipid Kinase / Itpk1 Family / Inositol-tetrakisphosphate 1-kinase

IDG Development Level Summary

Tdark

These are targets about which virtually nothing is known. They do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 42.82   (req: < 5)

Gene RIFs: 9   (req: <= 3)

Antibodies: 268   (req: <= 50)

Tbio

These targets do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 42.82   (req: >= 5)

Gene RIFs: 9   (req: > 3)

Antibodies: 268   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 20

Tchem

Target has at least one ChEMBL compound with an activity cutoff of < 30 nM - AND - satisfies the preceding conditions

Active Ligand: 0

Tclin

Target has at least one approved drug - AND - satisfies the preceding conditions

Active Drug: 0