PI51A_HUMAN

Source: PM23856902
PM22954596
Marked as 'Membrane associated protein'
Confidence: medium (present in either hRBCD or BSc_CH or PM22954596) Search PubMed for
(RBC AND this entry)
Gene names: PIP5K1A
Protein names and data: PI51A_HUMAN , Phosphatidylinositol 4-phosphate 5-kinase type-1 alpha; PIP5K1-alpha; PtdIns(4)P-5-kinase 1 alpha; 2.7.1.68 , 68 kDa type I phosphatidylinositol 4-phosphate 5-kinase alpha; Phosphatidylinositol 4-phosphate 5-kinase type I alpha; PIP5KIalpha Lenght: 562 a.a.
Mass: 62633 Da
fasta formatted sequence
Function: Catalyzes the phosphorylation of phosphatidylinositol 4- phosphate (PtdIns4P) to form phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2). PtdIns(4,5)P2 is involved in a variety of cellular processes and is the substrate to form phosphatidylinositol 3,4,5-trisphosphate (PtdIns(3,4,5)P3), another second messenger. The majority of PtdIns(4,5)P2 is thought to occur via type I phosphatidylinositol 4-phosphate 5-kinases given the abundance of PtdIns4P. Participates in a variety of cellular processes such as actin cytoskeleton organization, cell adhesion, migration and phagocytosis. Required for membrane ruffling formation, actin organization and focal adhesion formation during directional cell migration by controlling integrin-induced translocation of RAC1 to the plasma membrane. Together with PIP5K1C is required for phagocytosis, but they regulate different types of actin remodeling at sequential steps. Promotes particle ingestion by activating WAS that induces Arp2/3 dependent actin polymerization at the nascent phagocytic cup. Together with PIP5K1B is required after stimulation of G-protein coupled receptors for stable platelet adhesion. Plays a role during calcium-induced keratinocyte differentiation. Recruited to the plasma membrane by the E-cadherin/beta-catenin complex where it provides the substrate PtdIns(4,5)P2 for the production of PtdIns(3,4,5)P3, diacylglycerol and inositol 1,4,5-trisphosphate that mobilize internal calcium and drive keratinocyte differentiation. Together with PIP5K1C have a role during embryogenesis. Functions also in the nucleus where acts as an activator of TUT1 adenylyltransferase activity in nuclear speckles, thereby regulating mRNA polyadenylation of a select set of mRNAs.
Catalytic activity: ATP + 1-phosphatidyl-1D-myo-inositol 4- phosphate = ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate.
Cellular location: Cell membrane. Cytoplasm (By similarity). Nucleus speckle. Cell projection, ruffle. Note=Colocalizes with RAC1 at actin-rich membrane ruffles. Localizes to nuclear speckles and associates with TUT1 to regulate polyadenylation of selected mRNAs.
Tissue specificity: Highly expressed in heart, placenta, skeletal muscle, kidney and pancreas. Detected at lower levels in brain, lung and liver.

Database cross-references

UniProt: Q99755
Ensembl: ENST00000349792
Ensembl: ENST00000368888
Ensembl: ENST00000368890
Ensembl: ENST00000441902
MIM: 603275
neXtProt: NX_Q99755
Antibodypedia: Q99755 (may not find the protein thus also not any antibody)
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