Abstract
A protein kinase specific for casein and acidic ribosomal proteins was isolated and partly characterized.
It was found that the enzyme utilizes GTP and ATP as phosphoryl donors. Its affinity for ATP was considerably higher than for GTP with the km values of 7.6 × 10-6M and 5.5 × 10-5M, respectively.
Two-dimensional acrylamide gel electrophoresis revealed the phosphorylation of the same ribosomal proteins with either of the [γ-32P] nucleotides used. It was also shown that one acidic protein (S1 or S2) of 40 S and two acidic proteins (L2 and L3) of 60 S ribosomal subunits were predominantly phosphorylated in vitro. The phosphorylated proteins: L2 and L3 seem to correspond to the proteins of L7 and L12 of E. coli ribosomes. The isolated kinase phosphorylated several basic ribosomal proteins though to a lower extent than the acidic ones.
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Kudlicki, W., Grankowski, N. & Gasior, E. Ribosomal protein as substrate for a GTP-dependent protein kinase from yeast. Mol Biol Rep 3, 121–129 (1976). https://doi.org/10.1007/BF00423225
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DOI: https://doi.org/10.1007/BF00423225