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- W104569581 abstract "These studies were done to determine the identity of a protein kinase that phosphorylates the mRNA cap binding protein (CBP). Two chromatographic steps (dye and ligand and ion exchange HPLC) produced a 500x purification of an enzyme activity in rabbit reticulocytes that phosphorylated CBP at serine residues. Isoelectric focusing analysis of kinase treated CBP demonstrated 5 isoelectric species of which the 2 most anodic species were phosphorylated (contained /sup 32/P). This kinase activity phosphorylated CBP when it was isolated or in the eIF-4F complex. Purified protein kinase C, cAMP or cGMP dependent protein kinase, casein kinase I or II, myosin light chain kinase or insulin receptor kinase did not significantly phosphorylate isolated CBP or CBP in the eIF-4F complex. However, cAMP and cGMP dependent protein kinases and casein kinase II phosphorylated eIF-4A but did not phosphorylate the 46 kDa component of eIF-4F. cAMP dependent protein kinase phosphorylated a approx. 220 kDa protein doublet in eIF-4F preparations. These studies indicate that CBP kinase activity probably represents a previously unidentified protein kinase. In addition, eIF-4A appears to be phosphorylated by several protein kinases whereas the 46 kDa component of the eIF-4F complex was not." @default.
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- W104569581 date "1987-05-01" @default.
- W104569581 modified "2023-09-24" @default.
- W104569581 title "Phosphorylation of the mRNA cap binding protein and eIF-4A by different protein kinases" @default.
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