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. 1982 Jul 24;10(14):4321–4337. doi: 10.1093/nar/10.14.4321

Alignment of nucleosomes along DNA and organization of spacer DNA in Drosophila chromatin.

V L Karpov, S G Bavykin, O V Preobrazhenskaya, A V Belyavsky, A D Mirzabekov
PMCID: PMC320802  PMID: 6812025

Abstract

A series of mono- and dinucleosomal DNAs characterized by an about ten-base periodicity in the size were revealed in the micrococcal nuclease digests of Drosophila chromatin which have 180 +/- 5 base pair (bp) nucleosomal repeat. 20, 30, and 40 bp spacers were found to be predominant in chromatin by trimming DNA in dinucleosomes to the core position. Among several identified mononucleosomes (MN), MN170, MN180 and MN190 were isolated from different sources (the figures indicate the DNA length in bp). The presence of the 10, 20, and 30 bp long spacers was shown in these mononucleosomes by crosslinking experiments. The interaction of histone H3 with the spacer in the Drosophila MN180 particle was also shown by the crosslinking /5/. We conclude from these results that the 10 n bp long intercore DNA (n = 2, 3 and 4) is organized by histone H3, in particular, and together with the core DNA forms a continuous superhelix. Taken together, these data suggest that Drosophila chromatin consists of the regularly aligned and tightly packed MN180, as a repeating unit, containing 10 and 20 bp spacers at the ends of 180 bp DNA. Within the asymmetric and randomly oriented in chromatin MN180, the cores occupy two alternative positions spaced by 10 bp.

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Selected References

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