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• W1569489894 abstract "The substrate specificities of cyclic GMP-dependent and cyclic AMP-dependent protein kinases have been compared by kinetic analysis using synthetic peptides as substrates. Both enzymes catalyzed the transfer of phosphate from ATP to calf thymus histone H2B, as well as to two synthetic peptides, Arg-Lys-Arg-Ser32-Arg-Lys-Glu and Arg-Lys-Glu-Ser36-Tyr-Ser-Val, corresponding to the amino acid sequences around serine 32 and serine 36 in histone H2B. Serine 38 in the latter peptide was not phosphorylated by either enzyme. Cyclic GMP-dependent kinase and cyclic AMP-dependent kinase catalyzed the incorporation of 1.1 and 2.0 mol of phosphate/mol of histone H2B, respectively. The phosphorylation of histone H2B, respectively. The phosphorylation of histone H2B by cyclic GMP-dependent kinase showed two distinct optima as the magnesium concentration was increased. However, the phosphorylation of either synthetic peptide by this enzyme was depressed at high magnesium concentrations. As the pH of reaction mixtures was elevated from pH 6 to pH 9, the rate of phosphorylation of Arg-Lys-Arg-Ser32-Arg-Lys-Glu by cyclic GMP-dependent kinase continually increased. Acetylation of the NH2 terminus of the peptide did not qualitatively affect this pH profile, but did increase the Vmax value of the enzyme 3-fold. The apparent Km and Vmax values for the phosphorylation of Arg-Lys-Arg-Ser32-Arg-Lys-Glu by cyclic GMP-dependent kinase were 21 microM and 4.4 mumol/min/mg, respectively. The synthetic peptide Arg-Lys-Glu-Ser36-Tyr-Ser-Val was a relatively poor substrate for cyclic GMP-dependent kinase, exhibiting a Km value of 732 microM, although the Vmax was 12 micromol/min/mg. With histone H2B as substrate for the cyclic GMP-dependent kinase, two different Km values were apparent. The Km values for cyclic AMP-dependent kinase for either synthetic peptide were approximately 100 microM, but the Vmax for Arg-Lys-Arg-Ser32-Arg-Lys-Glu was 1.1 mumol/min/mg, while the Vmax for Arg-Lys-Glu-Ser36-Tyr-Ser-Val was 16.5 mumol/min/mg. These data suggest that although the two cyclic nucleotide-dependent protein kinases have similar substrate specificities, the determinants dictated by the primary sequence around the two phosphorylation sites in histone H2B are different for the two enzymes." @default.
• W1569489894 created "2016-06-24" @default.
• W1569489894 creator A5028469286 @default.
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• W1569489894 date "1979-10-01" @default.
• W1569489894 modified "2023-10-05" @default.
• W1569489894 title "Comparison of the substrate specificity of adenosine 3':5'-monophosphate- and guanosine 3':5'-monophosphate-dependent protein kinases. Kinetic studies using synthetic peptides corresponding to phosphorylation sites in histone H2B." @default.
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• W1569489894 doi "https://doi.org/10.1016/s0021-9258(19)83577-9" @default.
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