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Protein kinases in amphibian ectoderm induced for neural differentiation

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Summary

Ectoderm explants from early gastrula stages of Xenopus laevis were induced with a neutralizing factor. The factor was isolated from Xenopus gastrulae and partially purified by chromatography on DEAE cellulose. The ectoderm was cultured for different periods of time and then homogenized. Protein kinase activity was determined in the homogenates from induced and control explants with histone H 1 or C-terminal peptide derived from histone H 1 as substrates. The C-terminal peptide is a more specific substrate for protein kinase C, whereas histoneH 1 is a substrate for cAMP/cGMP-dependent protein kinases as well protein kinase C. With both substrates the enzyme activity increases after induction. With the C-terminal peptide as the substrate the protein kinase activity is lower, but its relative increase after induction higher. This suggests that besides cAMP/cGMP dependent protein kinases protein kinase C or related enzymes are involved in the neural induction and differentiation processes. This corresponds to previous experiments which have shown that treatment of ectoderm with phorbol myristate acetate, an activator of protein kinase C and protein kinase C related enzymes, initiates neural differentiation. Endogeneous substrates, which are more intensively phosphorylated after induction are proteins with apparent molecular weights 21 kDa and 31 kDa. Addition of protein kinase C to the induced and control homogenates abolishes the difference in the phosphorylation rate of these proteins.

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  1. Institut für Molekularbiologie und Biochemie, Freie Universität Berlin, Arnimallee 22, D-1000, Berlin 33

    Michael Davids

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Davids, M. Protein kinases in amphibian ectoderm induced for neural differentiation. Roux's Arch Dev Biol 197, 339–344 (1988). https://doi.org/10.1007/BF00375953

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