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- Table of Contents
Facts about Phosphatidylinositol 3,4,5-trisphosphate 5-phosphatase 1.
Mediates signaling from the FC-gamma-RIIB receptor (FCGR2B), playing a central role in terminating signal transduction from triggering immune/hematopoietic cell receptor systems. Acts as a negative regulator of myeloid cell proliferation/survival and chemotaxis, mast cell degranulation, immune cells homeostasis, integrin alpha-IIb/beta-3 signaling in platelets and JNK signaling in B-cells.
Human | |
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Gene Name: | INPP5D |
Uniprot: | Q92835 |
Entrez: | 3635 |
Belongs to: |
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inositol 1,4,5-trisphosphate 5-phosphatase family |
145kD; EC 3.1.3; hp51CNMGC142142; Inositol polyphosphate-5-phosphatase of 145 kDa; inositol polyphosphate-5-phosphatase, 145kDa; INPP5D; MGC104855; SHIP; SHIPMGC142140
Mass (kDA):
133.292 kDA
Human | |
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Location: | 2q37.1 |
Sequence: | 2; NC_000002.12 (233060342..233207903) |
Specifically expressed in immune and hematopoietic cells. Expressed in bone marrow and blood cells. Levels vary considerably within this compartment. Present in at least 74% of immature CD34+ cells, whereas within the more mature population of CD33+ cells, it is present in only 10% of cells. Present in the majority of T-cells, while it is present in a minority of B-cells (at protein level).
Cytoplasm. Cell membrane; Peripheral membrane protein. Membrane raft. Cytoplasm, cytoskeleton. Membrane; Peripheral membrane protein. Translocates to the plasma membrane when activated, translocation is probably due to different mechanisms depending on the stimulus and cell type. Translocates from the cytoplasm to membrane ruffles in a FCGR3/CD16-dependent manner. Colocalizes with FC-gamma-RIIB receptor (FCGR2B) or FCGR3/CD16 at membrane ruffles. Tyrosine phosphorylation may also participate in membrane localization.
PMID: 8769125 by Drayer A.L., et al. Cloning and expression of a human placenta inositol 1,3,4,5- tetrakisphosphate and phosphatidylinositol 3,4,5-trisphosphate 5- phosphatase.
PMID: 8874179 by Ware M.D., et al. Cloning and characterization of human SHIP, the 145-kD inositol 5- phosphatase that associates with SHC after cytokine stimulation.