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Biochem J. 1996 Jun 1;316 ( Pt 2):475-80.

Co-operative interactions of oligonucleosomal DNA with the H1e histone variant and its poly(ADP-ribosyl)ated isoform.

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Dipartimento di Scienze Biochimiche, A. Rossi Fanelli, Università di Roma La Sapienza, Italy.


H1 histone somatic variants from L929 mouse fibroblasts were purified by reverse-phase HPLC. We analysed the ability of each H1 histone variant to allow the H1-H1 interactions that are essential for the formation of the higher levels of chromatin structure, and we investigated the role played by the poly(ADP-ribosyl)ation process. Cross-linking analysis showed that H1e is the only somatic variant which, when bound to DNA, is able to produce H1-H1 polymers; the size of polymers was decreased when H1e was enriched in its poly(ADP-ribosyl)ated isoform. Measurement of the methyl-accepting ability in native nuclei compared with nuclei in which poly(ADP-ribosyl)ation was induced showed that the poly(ADP-ribosyl)ated H1 histone had not been removed from linker regions, in spite of its different interaction with DNA.

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