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• W2064262495 abstract "Using competitive reconstitution, we have refined the parameters for the binding of histone octamers to artificial nucleosome-positioning sequences of the form: (A/T3nn(G/C)3nn. We find that the optimal period between flexible segments is approximately 10.1 base-pairs, supporting the view that the DNA on the nucleosome surface is overwound. The strongest requirement for flexible DNA is near the protein dyad. However, we see no indication of changes in DNA helical repeat in this region. Using a series of repetitive sequences, we confirm that neither all A/T-rich nor all G/C-rich regions are identical in promoting nucleosome formation. Surprisingly, A/T-rich segments containing the TpA step, subject to purine-purine clash in the minor groove, favor nucleosome formation over sequences lacking this step. Short tracts of adenine residues are found to position on the histone surface like other A/T-rich regions, in the manner predicted by the direction of their sequence-directed bends as determined by electrophoretic methods. Tracts containing five adenine residues are extremely aniostropic in their flexibility and are strongly detrimental to nucleosome formation when positioned for major groove compression. Longer adenine tracts are found to position near the ends of the nucleosomal DNA. However, other positions may be occupied by an A12 tract, with only a minor penalty in the free energy of nucleosome formation. Overall, reconstituted nucleosome positions are translationally degenerate, suggesting a weak dependence on DNA flexibility for nucleosome positioning. Dinucleosomal reconstitutions on tandem dimers of the 5 S RNA gene of Lytechinus variegatus demonstrate a weak phasing dependence for the interaction between nucleosomes. This interaction is maximal for the 202 base-pair repeat and suggests a co-operative mechanism for the formation of ordered nucleosomal arrays based on a combination of DNA flexibility and nucleosome-nucleosome interactions." @default.
• W2064262495 created "2016-06-24" @default.
• W2064262495 creator A5025930143 @default.
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• W2064262495 date "1990-11-01" @default.
• W2064262495 modified "2023-09-25" @default.
• W2064262495 title "Effects of DNA sequence and histone-histone interactions on nucleosome placement" @default.
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• W2064262495 doi "https://doi.org/10.1016/s0022-2836(05)80061-0" @default.
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