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- W2007478717 abstract "Several polynucleotides that assume an A-form helical structure in solution are unable to form nucleosomes. We attempted to establish a relationship between the ease of the A-form----B-form helix transition and ease of nucleosome formation by reconstituting nucleosomes using ribosubstituted DNA containing various levels of ribonucleotides. Instead we discovered that, when riboadenosine is substituted for deoxyriboadenosine, even one ribonucleotide per 125 base pairs of DNA reduces nucleosome formation and that DNA containing greater than 5% ribonucleotide is completely unable to form nucleosomes. Ribosubstituted DNA restriction fragments exhibited altered mobility on native 6% polyacrylamide gels, indicating an altered helical structure (probably bending). The effects on both nucleosome formation and gel mobility are nucleotide specific and are correlated, being greatest for riboadenosine and decreasing in the order riboadenosine greater than riboguanosine greater than ribocytosine. The results are consistent with the hypothesis that the rate of nucleosome formation can be drastically reduced by isolated local perturbations, such as kinking or bending, in the helical structure of DNA." @default.
- W2007478717 created "2016-06-24" @default.
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- W2007478717 date "1987-03-01" @default.
- W2007478717 modified "2023-09-26" @default.
- W2007478717 title "Ribonucleotide-induced helical alteration in DNA prevents nucleosome formation." @default.
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- W2007478717 doi "https://doi.org/10.1073/pnas.84.5.1162" @default.
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