Abstract:
:SHPTP2 is a ubiquitously-expressed SH2-containing tyrosine phosphatase that is tyrosine phosphorylated in response to activation of various receptor and nonreceptor tyrosine kinases. SHPTP2 associates with the platelet-derived growth factor (PDGF) receptor after ligand stimulation, and binding of SHPTP2 to this receptor promotes tyrosine phosphorylation of SHPTP2. The yeast two-hybrid system was modified to identify partners of tyrosine-phosphorylated proteins. Using SHPTP2 as bait and supplying an exogenous tyrosine kinase gene to the yeast cells, we have found that SHPTP2 interacts with another signaling protein, Grb7. We have localized the region of interaction to tyrosine 580 in the carboxyl end of SHPTP2 and to the SH2 domain in the carboxy-terminus of Grb7. We demonstrate that Grb7 binds to SHPTP2 in vitro under conditions where the latter is tyrosine-phosphorylated. These experiments show that this modified two hybrid technique may be useful for the identification of proteins involved in tyrosine kinase signal transduction cascades.
journal_name
Oncogenejournal_title
Oncogeneauthors
Keegan K,Cooper JAsubject
Has Abstractpub_date
1996-04-04 00:00:00pages
1537-44issue
7eissn
0950-9232issn
1476-5594journal_volume
12pub_type
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