Type II inositol 1,4,5-trisphosphate 5-phosphatase - P32019 (I5P2_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Hydrolyzes phosphatidylinositol 4,5-bisphosphate (PtIns(4,5)P2) and the signaling molecule phosphatidylinositol 1,4,5-trisphosphate (PtIns(1,4,5)P3), and thereby modulates cellular signaling events. UniProt
Catalytic Activity
a 1,2-diacyl-sn-glycero-3-phospho-1D-myo-inositol-4,5-bisphosphate + H2O = 1,2-diacyl-sn-glycero-3-phospho-1D-myo-inositol 4-phosphate + phosphate UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Interacts with APPL1, FAM109A and FAM109B (PubMed:20133602, PubMed:21233288). Interacts with several Rab GTPases, at least RAB1A, RAB2A, RAB5A, RAB6A, RAB8A, RAB9A and RAB33B; these interactions may play a dual role in targeting INPP5B to the specific membranes and stimulating its phosphatase activity (PubMed:17956944, PubMed:26824392, Ref.12). Interacts preferentially with non-phosphorylated RAB8A; phosphoryation of RAB8A on 'Thr-72' disrupts this interaction (PubMed:26824392). Interacts with INPP5F (PubMed:25869668). UniProt
The ASH (ASPM-SPD2-Hydin) and RhoGAP (Rho GTPase activating) domains form a single folding module. The ASH domain has an immunoglobulin-like fold, the Rho-GAP domain lacks the catalytic arginine and is catalytically inactive. The ASH-RhoGAP module regulates the majority of the protein-protein interactions currently described. The ASH domain mediates association with membrane-targeting Rab GTPases. The Rho-GAP domain interacts with the endocytic adapter APPL1, which is then displaced by FAM109A and FAM109B as endosomes mature, all three interactions rely on F&H motifs, an approximately 12-13 amino-acid sequence centered around Phe and His residues essential for binding (By similarity). UniProt
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Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
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Validation Track

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Data in red indicates combined ranges of Homology Models from the SWISS-MODEL Repository  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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