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- W1502446689 abstract "Two cytosolic proteins of murine epidermis or porcine spleen with molecular masses of 37 kDa (p37) and 50 kDa (p50) are differentially phosphorylated in vitro by the purified protein kinase C (PKC) isoenzymes α, β, γ (cPKC) and PKCδ. p37, identified as annexin I, is preferentially phosphorylated by cPKC, whereas p50, identified as elongation factor eEF-1α, is phosphorylated with much greater efficacy by PKCδ than by cPKC. Using the recombinant PKC isoenzymes α, β, γ, δ, ε, η, and ϛ, we could show that purified eEF-1α is indeed a specific substrate of PKCδ. It is not significantly phosphorylated by PKCε, -η, and -ϛ and only slightly by PKCα, -β, and -γ. PKCδ phosphorylates eEF-1α at Thr-431 (based on the murine amino acid sequence). The peptide RFAVRDMRQTVAVGVIKAVDKK with a sequence corresponding to that of 422-443 from murine eEF-1α and containing Thr-431 is an absolutely specific substrate for the δ-type of PKC. The single basic amino acid close to Thr-431 (Arg-429) is essential for recognition of the peptide as a substrate by PKCδ and for the selectivity of this recognition. Substitution of Arg-429 by alanine abolishes the ability of PKCδ to phosphorylate the peptide, and insertion of additional basic amino acids in the vicinity of Thr-431 causes a complete loss of selectivity. Two cytosolic proteins of murine epidermis or porcine spleen with molecular masses of 37 kDa (p37) and 50 kDa (p50) are differentially phosphorylated in vitro by the purified protein kinase C (PKC) isoenzymes α, β, γ (cPKC) and PKCδ. p37, identified as annexin I, is preferentially phosphorylated by cPKC, whereas p50, identified as elongation factor eEF-1α, is phosphorylated with much greater efficacy by PKCδ than by cPKC. Using the recombinant PKC isoenzymes α, β, γ, δ, ε, η, and ϛ, we could show that purified eEF-1α is indeed a specific substrate of PKCδ. It is not significantly phosphorylated by PKCε, -η, and -ϛ and only slightly by PKCα, -β, and -γ. PKCδ phosphorylates eEF-1α at Thr-431 (based on the murine amino acid sequence). The peptide RFAVRDMRQTVAVGVIKAVDKK with a sequence corresponding to that of 422-443 from murine eEF-1α and containing Thr-431 is an absolutely specific substrate for the δ-type of PKC. The single basic amino acid close to Thr-431 (Arg-429) is essential for recognition of the peptide as a substrate by PKCδ and for the selectivity of this recognition. Substitution of Arg-429 by alanine abolishes the ability of PKCδ to phosphorylate the peptide, and insertion of additional basic amino acids in the vicinity of Thr-431 causes a complete loss of selectivity." @default.
- W1502446689 created "2016-06-24" @default.
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- W1502446689 date "1995-03-01" @default.
- W1502446689 modified "2023-10-17" @default.
- W1502446689 title "Protein Kinase Cσ-specific Phosphorylation of the Elongation Factor eEF-1α and an eEF-1α Peptide at Threonine 431" @default.
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- W1502446689 doi "https://doi.org/10.1074/jbc.270.11.6156" @default.
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