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Potent Stimulation of SH-PTP2 Phosphatase Activity by Simultaneous Occupancy of Both SH2 Domains
Open accessAbstract
Src homology 2 (SH2) domains are phosphotyrosine binding modules found within many cytoplasmic proteins. A major function of SH2 domains is to bring about the physical assembly of signaling complexes. We now show that, in addition, simultaneous occupancy of both SH2 domains of the phosphotyrosine phosphatase SH-PTP2 (Syp, PTP 1D, PTP-2C) by a tethered peptide with two IRS-1-derived phosphorylation sites potently stimulates phosphatase activity. The concentration required for activation by the tethered peptide is 80-160-fold lower than either corresponding monophosphorylated peptide. Moreover, the diphosphorylated peptide stimulates catalytic activity 37-fold, compared with 9-16-fold for the monophosphorylated peptides. Mutational analyses of the SH2 domains of SH-PTP2 confirm that both SH2 domains participate in this effect. Binding studies with a tandem construct comprising the N- plus C-terminal SH2 domains show that the diphosphorylated peptide binds with 60-90-fold higher affinity than either monophosphorylated sequence. These results demonstrate that SH-PTP2 activity can be potently regulated by interacting via both of its SH2 domains with phosphoproteins having two cognate phosphorylation sites.
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Metadata
- Authors
- Pluskey, S., Wandless, T. J., Walsh, C. T., & Shoelson, S. E.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1995-02
- Volume
- 270
- Issue
- 7
- Pages
- 2897-2900
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2023090301
- Cited by
- 282
- References
- 1
- FWCI
- 8.88
- Type
- journal article
- Language
- en
- Open access
- hybrid
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