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• W1524153003 abstract "Cys-cdc2(8-20), a synthetic peptide derived from p34cdc2, was previously reported to be a specific and efficient substrate of a pp60c-src-related tyrosine kinase isolated from bovine spleen (the spleen tyrosine kinase) (Litwin, C.M.E., Cheng, H.-C., and Wang, J.H. (1991) J. Biol. Chem. 266, 2557-2566). The longer peptide, cdc2(1-24), was found to be phosphorylated by the kinase with similar efficiency, and Tyr15 was the only amino acid residue phosphorylated. This indicated that the amino acid sequence of cdc2(8-20) peptide, EKI-GEGTYGVVYK, contained the structural features important for protein tyrosine kinase substrate activity. A stepwise procedure using synthetic peptides was employed to investigate such structural features. First, a computer search of protein sequences homologous to cdc2(8-20) uncovered five protein kinases containing homologous sequence with tyrosine at a position corresponding to Tyr15 of p34cdc2. Second, a peptide derived from ribosomal S6 protein kinase (rsk(436-456] was synthesized. The rsk(436-456) peptide contained a segment, ETIGVGSYSVCKR, which is highly homologous to that of cdc2(8-20). It was found to be a very poor substrate of the spleen tyrosine kinase. Third, peptide analogs of cdc2(6-20) with single substitutions of amino acid residues Lys9, Glu12, Thr14, Gly16, Val18, and Tyr19 by amino acid residues at corresponding positions of rsk were synthesized and tested as spleen tyrosine kinase substrates. Only Glu12 and Thr14 substituted peptide analogs showed decreased substrate activities. (The substrate activity of a peptide is the ability of the peptide to serve as the substrate of the spleen tyrosine kinase. It was determined of the spleen tyrosine kinase. It was determined either by the kinetic parameters (Km and Vmax) of phosphorylation of the peptide or by the initial phosphorylation rate of the peptide by the spleen tyrosine kinase.) An analog with double substitution at Glu12 An analog with double substitution at Glu12 and Thr14 was found to be almost as poor a substrate as the rsk peptide. In addition, peptide analogs with Tyr15 substituted by Phe or D-Tyr had poor substrate activities as well as weak inhibitory activities. Thus, Glu12, Thr14, and Tyr15 residues of p34cdc2 contained structural components essential for the efficient phosphorylation of the peptides derived from p34cdc2 by the pp60c-src-related spleen tyrosine kinase." @default.
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• W1524153003 date "1991-09-01" @default.
• W1524153003 modified "2023-10-16" @default.
• W1524153003 title "Structural basis of specific and efficient phosphorylation of peptides derived from p34cdc2 by a pp60src-related protein tyrosine kinase." @default.
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• W1524153003 doi "https://doi.org/10.1016/s0021-9258(18)55215-7" @default.
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