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- W2092185729 abstract "Sam68, a nuclear RNA-binding protein, is a major substrate of the Src tyrosine kinase in mitotic cells. In addition to a tyrosine-rich C-terminal region, Sam68 also has six poly-proline (SH3-binding) sites, many of which are located in an amino-terminal region. Sam68 appears to act as an adaptor protein, associating with many SH2- and SH3-containing signal-transducing proteins (Richard et al., Mol. Cell. Biol. 15:186-197, 1995). Here we describe a novel 55kDa protein, Salpalpha, which has sequence similarity to Sam68 throughout its length. Salpalpha lacks the amino-terminal region found in Sam68, and has only a single poly-proline site, which binds the SH3 domain of the p85 subunit of PI 3-kinase. Salpalpha is tyrosine-phosphorylated when expressed in Rous sarcoma virus-infected chicken embryo fibroblasts (RSV-CEF); unlike Sam68, however, Salpalpha does not co-precipitate with v-Src. Salpbeta, an alternatively spliced isoform lacking the C-terminal tyrosine-rich region, is also tyrosine-phosphorylated in RSV-CEF, and also binds the SH3 domain of p85. We further show that expression of either Salpalpha or Salpbeta down-regulates the expression of Sam68 in CEF, and arrests the growth of these cells. Our results suggest that Salp may function as a negative regulator of cell growth." @default.
- W2092185729 created "2016-06-24" @default.
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- W2092185729 date "1999-11-01" @default.
- W2092185729 modified "2023-10-18" @default.
- W2092185729 title "Salpα and Salpβ, growth-arresting homologs of Sam68" @default.
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- W2092185729 doi "https://doi.org/10.1016/s0378-1119(99)00421-7" @default.
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