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. 1986 Nov 25;14(22):8735–8754. doi: 10.1093/nar/14.22.8735

Antibiotics which can alter the rotational orientation of nucleosome core DNA.

J Portugal, M J Waring
PMCID: PMC311908  PMID: 3024118

Abstract

Four well-characterised DNA-binding ligands have been tested for effects on reconstituted nucleosome core particles containing the 160 bp tyrT DNA fragment. Two, netropsin and berenil, were found to change the rotational orientation of the DNA on the surface of the protein as judged by marked alterations in the pattern of fragments produced by exposure to DNAase I. Qualitatively their effects were very similar to those previously reported for the related antibiotic distamycin, suggesting that the phenomenon of induced rotation may be a characteristic property of ligands which bind in the narrow groove of the DNA helix. Two intercalators did not produce the effect but, at high concentrations, caused gross disruption of the nucleoprotein structure with apparent release of DNA from the histone octamer. At moderate concentrations little or no effect was detectable with nogalamycin, suggestive of failure to bind as a result of constraints on local opening of the DNA helix. With moderate concentrations of actinomycin, protection of GpC sequences was clearly visible together with some evidence of increase in helix pitch, but no sign of altered phasing of DNA within the nucleosome core particles.

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Selected References

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