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  • Title: Synthetic phosphopeptides are substrates for casein kinase II.
    Author: Litchfield DW, Arendt A, Lozeman FJ, Krebs EG, Hargrave PA, Palczewski K.
    Journal: FEBS Lett; 1990 Feb 12; 261(1):117-20. PubMed ID: 2307228.
    Abstract:
    Casein kinase II is a protein serine/threonine kinase that exhibits a preference for acidic substrates. Previous studies have demonstrated that a glutamic acid 3 amino acids C-terminal (+3) to a serine or threonine is required for phosphorylation. To examine the ability of phosphoserine and phosphothreonine residues to serve as specificity determinants for casein kinase II, phosphopeptides containing either of these phosphoamino acids in the +3 position were synthesized and tested as substrates. Phosphopeptides containing phosphoserine in the +3 position were readily phosphorylated. In contrast, corresponding phosphothreonine-containing peptides were very poorly phosphorylated. These results imply that prior phosphorylation of substrate proteins on serine, but not threonine residues, may II.
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