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- W4238353321 abstract "Unlike the peptides SAEAAA and SEEAAA which are not substrates for casein kinase 2 (CK-2) their analogs SAAEAE and SAAEAA are still significantly phosphorylated. Their Km values, however, (13.3 and 18.9 mM, respectively) are almost two orders of magnitude higher than that of SEEEEE and their Vmax values are 3− and 14-fold lower than that of SAAEEE. The peptide ESEEEEE, but not ASEEEEE, is a slightly better substrate than SEEEEE, while both RSEEEEE and SEEEKE are very poor substrates compared to ASEEEEE and SEEEAE, respectively. SAAEAE is much more responsive to polylysine stimulation and polyphophate inhibition than is SEEEEE. Taken together these data show that a single acidic residue at the third position from the C-terminal side of the phosphorylatable amino acid represents not only a necessary, but also a sufficient condition for site recognition by CK-2. Optimal phosphorylation efficiency, however, requires an extended C-terminal cluster of several acidic residues, and can be compromised by the presence of only a basic residue either inside the acidic cluster or adjacent to the N-terminal side of the phosphoacceptor amino acid. The structure of the phosphoacceptor site can greatly influence the efficacy of substrate-directed effectors of CK-2" @default.
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- W4238353321 date "1988-10-01" @default.
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- W4238353321 title "Synthetic peptide substrates for casein kinase 2. Assessment of minimum structural requirements for phosphorylation" @default.
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- W4238353321 doi "https://doi.org/10.1016/s0005-2728(88)80048-3" @default.
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