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- W2081103615 abstract "Srp1p, the protein encoded by SRP1 of Saccharomyces cerevisiae, is a nuclear-pore-associated protein. Its Xenopus homolog, importin, was recently shown to be an essential component required for nuclear localization signal (NLS)-dependent binding of karyophilic proteins to the nuclear envelope [Gorlich, D., Prehn, S., Laskey, R. A. & Hartman, E. (1994) Cell 79, 767-778]. We have discovered a protein kinase whose activity is stimulated by Srp1p (Srp1p fused to glutathione S-transferase and expressed in Escherichia coli) and is detected by phosphorylation of Srp1p and of a 36-kDa protein, a component of the protein kinase complex. The enzyme, called Srp1p kinase, is a protein-serine kinase and was found in extracts in two related complexes of approximately 180 kDa and 220 kDa. The second complex, when purified, contained four protein components including the 36-kDa protein. We observed that, upon purification of the kinase, phosphorylation of Srp1p became very weak, while activation of phosphorylation of the 36-kDa protein by Srp1p remained unaltered. Significantly, NLS peptides and the nuclear proteins we have tested greatly stimulated phosphorylation of Srp1p, suggesting that Srp1p, complexed with karyophilic proteins carrying an NLS, is the in vivo substrate of this protein kinase." @default.
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- W2081103615 date "1995-05-23" @default.
- W2081103615 modified "2023-09-26" @default.
- W2081103615 title "Isolation of a yeast protein kinase that is activated by the protein encoded by SRP1 (Srp1p) and phosphorylates Srp1p complexed with nuclear localization signal peptides." @default.
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- W2081103615 doi "https://doi.org/10.1073/pnas.92.11.5159" @default.
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