Abstract:
:Src homology 2 (SH2) domains are phosphotyrosine-binding modules found within various signal-transducing proteins. We have determined by 125I competition assay and surface plasmon resonance that the SH2 domains of Src and Lck bind to a variety of phosphopeptides with similar affinity and specificity. Both bound with highest affinity [Kd(app) approximately 3.7 nM; ka = 2.4 x 10(5) M-1 x s-1; kd = 1.2 x 10(-3) s-1] a phosphopeptide having a Tyr(P)-Glu-Glu-Ile motif found in the hamster polyomavirus middle-sized tumor antigen. Intermediate affinity (5- to 40-fold lower) was observed with phosphopeptides corresponding to the regulatory domains of Src and Lck, containing Tyr527 and Tyr505, respectively. Lowest affinity (80- to 300-fold lower) was observed with phosphopeptides corresponding to phosphorylated tyrosines of GTPase-activating protein, insulin receptor substrate 1, and SH2 domain-containing protein-tyrosine-phosphatase 1.
journal_name
Proc Natl Acad Sci U S Aauthors
Payne G,Shoelson SE,Gish GD,Pawson T,Walsh CTdoi
10.1073/pnas.90.11.4902subject
Has Abstractpub_date
1993-06-01 00:00:00pages
4902-6issue
11eissn
0027-8424issn
1091-6490journal_volume
90pub_type
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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