Histone H4 from cuttlefish testis is sequentially acetylated. Comparison with acetylation of calf thymus histone H4
- PMID: 3818624
Histone H4 from cuttlefish testis is sequentially acetylated. Comparison with acetylation of calf thymus histone H4
Abstract
The differently acetylated subfractions of histone H4 isolated from cuttlefish testis and from calf thymus were separated by ion exchange chromatography on sulfopropyl-Sephadex, using a shallow linear gradient of guanidine hydrochloride in the presence of 6 M urea at pH 3.0. The tetra-, tri-, di-, mono-, and nonacetylated forms of cuttlefish H4 represent 2, 6.4, 18, 32.2, and 41.4% of the whole histone, respectively. The di-, mono-, and nonacetylated forms of calf H4 represent 11.7, 41.3, and 44% of the whole histone, respectively. The acetylation sites were determined in each subfraction by identification of the acetylated peptides. In each acetylated H4 subfraction, the acetylated tryptic peptides were identified by peptide mapping and amino acid analysis with reference to the peptide map of nonacetylated H4. In cuttlefish testis H4, lysine 12 is the main site of acetylation in the monoacetylated subfraction; lysines 5 and 12 are found acetylated in diacetylated H4; lysines 5, 12, and 16 are found acetylated in triacetylated H4. From these results and the stoichiometry of the different H4 subfractions, it can be concluded that lysine 5 is acetylated after lysine 12. In calf thymus, lysine 16 is the only site of acetylation in the monoacetylated subfraction. All the diacetylated forms are acetylated in lysine 16, the second site of acetylation being, in decreasing order, lysine 12, lysine 5, or lysine 8. These observations suggest that acetylation occurs in a sequential manner. Moreover, the sites of acetylation depend upon the biological event in which acetylation is involved.
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