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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Specific tyrosine phosphorylations mediate signal-dependent stimulation of SHIP2 inositol phosphatase activity, while the SH2 domain confers an inhibitory effect to maintain the basal activity.

SH2 domain-containing 5-inositol phosphatase (SHIP2) is implicated in the development of type 2 diabetes and cancer. Tyrosine phosphorylation of SHIP2 is shown to enhance its phosphatase activity. Using IP4 as a substrate, we show here that tyrosines 986, 987, and 1135 are critical for EGF-induced stimulation of SHIP2 activity. SHIP2 with a disrupted SH2 domain (R47G mutation) displays higher constitutive activity than wild-type SHIP2. Deletion of the C-terminus region similarly activates SHIP2. Thus, the SH2 domain of SHIP2, in conjunction with the C-terminus, confers an inhibitory effect to maintain a low basal activity, and signal-induced tyrosine phosphorylations overcome this effect to activate SHIP2.[1]

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