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• W1866820856 endingPage "14269" @default.
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• W1866820856 abstract "Phosphorylation of rabbit muscle glycogen synthase by cyclic AMP-dependent protein kinase has been shown to enhance subsequent phosphorylation by casein kinase I (Flotow, H., and Roach, P. J. (1989) J. Biol. Chem. 264, 9126-9128). In the present study, synthetic peptides based on the sequences of the four phosphorylated regions in muscle glycogen synthase were used to probe the role of substrate phosphorylation in casein kinase I action. With all four peptides, prior phosphorylation significantly stimulated phosphorylation by casein kinase I. A series of peptides was synthesized based on the NH2-terminal glycogen synthase sequence PLSRTLS7VSS10LPGL, in which phosphorylation at Ser7 is required for modification of Ser10 by casein kinase I. The spacing between the P-Ser and the acceptor Ser was varied to have 1, 2, or 3 intervening residues. The peptide with a 2-residue spacing (-S(P)-X-X-S-) was by far the best casein kinase I substrate. When the P-Ser residue at Ser7 was replaced with P-Thr, the resulting peptide was still a casein kinase I substrate. However, substitution of Asp or Glu residues at Ser7 led to peptides that were not phosphorylated by casein kinase I. Phosphorylation of one of the other peptides showed that Thr could also be the phosphate acceptor. From these results, we propose that there are substrates for casein kinase I for which prior phosphorylation is a critical determinant of protein kinase action. In these instances, an important recognition motif for casein kinase I appears to be -S(P)/T(P)-Xn-S/T- with n = 2 much more effective than n = 1 or n = 3. Thus, casein kinase I may be involved in hierarchal substrate phosphorylation schemes in which its activity is controlled by the phosphorylation state of its substrates." @default.
• W1866820856 created "2016-06-24" @default.
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• W1866820856 date "1990-08-01" @default.
• W1866820856 modified "2023-09-30" @default.
• W1866820856 title "Phosphate groups as substrate determinants for casein kinase I action." @default.
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• W1866820856 doi "https://doi.org/10.1016/s0021-9258(18)77295-5" @default.
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