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  • Title: Cyclic nucleotide-independent protein kinase from rat liver. Purification and characterization of a multifunctional protein kinase.
    Author: Ramakrishna S, Benjamin WB.
    Journal: J Biol Chem; 1985 Oct 05; 260(22):12280-6. PubMed ID: 4044596.
    Abstract:
    A rat liver cAMP-independent protein kinase that phosphorylates peptide b of ATP-citrate lyase (Ramakrishna, S., Pucci, D. L., and Benjamin, W. B. (1983) J. Biol. Chem. 258, 4950-4956) has been purified to apparent homogeneity. The molecular weight, determined by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate, sucrose density gradient, and by gel filtration, was found to be 36,000. This protein kinase phosphorylates in vitro ATP-citrate lyase, acetyl-CoA carboxylase, and glycogen synthase and does not phosphorylate phosphorylase, phosphorylase kinase, histone, phosvitin, and casein. It has Fa (activity factor) activity stimulating the ATP X Mg-dependent phosphatase and is therefore named a multifunctional protein kinase. This kinase differs from glycogen synthase kinase-3 with regard to substrate specificity, kinetic parameters, and physicochemical properties.
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