SHIP, a new player in cytokine-induced signalling.
We recently purified and cloned the cDNAs for the murine and human forms of a novel 145 kDa inositol polyphosphate 5-phosphatase (5-ptase) that becomes tyrosine phosphorylated and associated with Shc following stimulation of hemopoietic cells with multiple cytokines. Unlike most 5-ptases which hydrolyze phosphatidylinositol-4,5-P2-bisphosphate (PI-4,5-P2) and/or inositol-1,4,5-trisphosphate (I-1,4,5-P3), this enzyme selectively hydrolyzes the 5'-phosphate from inositol-1,3,4,5-tetraphosphate (I-1,3,4,5-P4) and phosphatidylinositol-3,4,5-trisphosphate (PI-3,4,5-P3), two inositol polyphosphates recently implicated in growth factor-mediated signalling. This 5-ptase is also unique among 5-ptases in that it is the only one to date to possess an SH2 domain. In this review we discuss the cloning, the Shc binding and the potential role of this protein, which we call SHIP, for SH2-containing inositol 5-phosphatase, in cell proliferation, differentiation and apoptosis.
Liu
L
L
Terry Fox Laboratory, British Columbia Cancer Research Centre, Vancouver, Canada.
Damen
J E
JE
Ware
M
M
Hughes
M
M
Krystal
G
G
D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D000818:Animals; D017209:Apoptosis / Q000502:physiology; D002454:Cell Differentiation; D002455:Cell Division; D016207:Cytokines / Q000502:physiology*; D051380:GRB2 Adaptor Protein; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000201:enzymology; D006801:Humans; D007295:Inositol Phosphates / Q000378:metabolism*; D051379:Mice; D008954:Models, Biological; D000072183:Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D011506:Proteins / Q000378:metabolism; D055765:Shc Signaling Adaptor Proteins; D015398:Signal Transduction / Q000502:physiology*; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D018909:src Homology Domains
D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D016207:Cytokines; D051380:GRB2 Adaptor Protein; C495948:GRB2 protein, human; C495949:Grb2 protein, mouse; D007295:Inositol Phosphates; D011506:Proteins; C528024:SHC1 protein, human; D055765:Shc Signaling Adaptor Proteins; C528034:Shc1 protein, mouse; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; C081655:inositol-1,3,4,5-tetrakisphosphate; D010744:Phosphoric Monoester Hydrolases; C098706:INPPL1 protein, human; D000072183:Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases