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The site-specific phosphorylation of bovine histone H1 by protein kinase C was investigated in order to further elucidate the substrate specificity of protein kinase C. Protein kinase C was found to phosphorylate histone H1 to 1 mol per mol. Using N-bromosuccinimide and thrombin digestions, the phosphorylation site was localized to the globular region of the protein, containing residues 71-122. A tryptic peptide containing the phosphorylation site was purified. Modification of the phosphoserine followed by amino acid sequence analysis demonstrated that protein kinase C phosphorylated histone H1 on serine 103. This sequence, Gly97-Thr-Gly-Ala-Ser-Gly-Ser(PO4)-Phe-Lys105, supports the contention that basic amino acid residues C-terminal to the phosphorylation site are sufficient determinants for phosphorylation by protein kinase C.
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