PMID: 7932740Oct 14, 1994Paper

Evidence indicating proximity in the nucleosome between the histone H4 N termini and the globular domain of histone H1

Journal of Molecular Biology
J L BanèresJ Parello

Abstract

Proteolysis of rat liver chromatin by the Arg-C peptidase, clostripain, is characterized by a progressive fragmentation of the N-terminal segments of the four core histones H2A, H2B, H3 and H4, until a well-defined limit digest is reached. This work addresses the case of histone H4. Two intermediate proteolytic sites are identified for this histone, i.e. Arg3 and Arg17, before the limit digest is achieved through cleavage of the polypeptide chain after Arg19. The accessibility of these intermediate sites depends strongly on the presence or absence of histone H1. When H1 is absent, both intermediate sites of histone H4 are similarly accessible, whereas one of them, Arg3, becomes totally inaccessible in the presence of histone H1. Di- and trinucleosomes were used with the aim of avoiding any interference with superstructural effects which can occur with longer polynucleosomes in the presence of H1. We also investigated the accessibility of the Arg sites of H1 that are located primarily in the central globular domain of this histone. In free histone H1, all the centrally located Arg sites are accessible to clostripain. In contrast, in the chromatin-bound state none of these sites is accessible. Besides the arginyl sites in the cen...Continue Reading

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