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- W1566146550 abstract "To search for peptides which serve as substrates for protein kinases, an approach based on peptide libraries has been developed. These peptide libraries are chemically synthesized by a modified divide-couple-recombine strategy. After reaction with the kinase of interest, the most highly phosphorylated substrate (selected from the library) is identified using on-line liquid chromatography-electrospray mass spectrometry (LC-ESMS). Negative ion LC-ESMS with stepped collision energy is used to identify phosphorylated peptides in the enzyme reactions. As predicted, the cAMP-dependent protein kinase is shown to preferentially phosphorylate Kemptide (Leu-Arg-Arg-Ala-Ser-Leu-Gly) in a library consisting of 19 variants of Kemptide substituted at position 2. Additional experiments have been carried out on the nonreceptor tyrosine kinase v-Abl using a peptide library based on the v-Src autophosphorylation site (Arg-Arg-Leu-Ile-Glu-Asp-Ala-Glu-Tyr-Ala-Ala-Arg-Gly). These results indicate that Ile is the optimal residue at the position N-terminal to tyrosine. Individual peptides containing the Glu-Asp-Ala-Ile-Tyr motif have Vmax/Km values 6-fold higher than the peptide based on the autophosphorylation site itself, confirming the results of the library experiments. This motif has been identified in several tyrosine kinases at a position in the sequence not previously reported to serve as a phosphorylation or autophosphorylation site." @default.
- W1566146550 created "2016-06-24" @default.
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- W1566146550 date "1994-03-01" @default.
- W1566146550 modified "2023-10-11" @default.
- W1566146550 title "Use of synthetic peptide libraries and phosphopeptide-selective mass spectrometry to probe protein kinase substrate specificity." @default.
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- W1566146550 doi "https://doi.org/10.1016/s0021-9258(17)37302-7" @default.
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