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• W2023863464 abstract "Nucleosomes, the basic structural elements of chromosomes, consist of 146 bp of DNA coiled around an octamer of histone proteins, and their presence can strongly influence gene expression. Considerations of the anisotropic flexibility of nucleotide triplets containing 3 cytosines or guanines suggested that a [5'(G/C)3 NN3']n motif might resist wrapping around a histone octamer. To test this, DNAs were constructed containing a 5'-CCGNN-3' pentanucleotide repeat with the Ns varied. Using in vitro nucleosome reconstitution and electron microscopy, a plasmid with 48 contiguous CCGNN repeats strongly excluded nucleosomes in the repeat region. Competitive reconstitution gel retardation experiments using DNA fragments containing 12, 24, or 48 CCGNN repeats showed that the propensity to exclude nucleosomes increased with the length of the repeat. Analysis showed that a 268-bp DNA containing a (CCGNN)48 block is 4.9 +/- 0.6-fold less efficient in nucleosome assembly than a similar length pUC19 fragment and approximately 78-fold less efficient than a similar length (CTG)n sequence, based on results from previous studies. Computer searches against the GenBank database for matches with a [(G/C)3NN]48 sequence revealed numerous examples that frequently were present in the control regions of TATA-less genes, including the human ETS-2 and human dihydrofolate reductase genes. In both cases the (G/C)3NN repeat, present in the promoter region, co-maps with loci previously shown to be nuclease hypersensitive sites." @default.
• W2023863464 created "2016-06-24" @default.
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• W2023863464 date "1996-08-20" @default.
• W2023863464 modified "2023-10-10" @default.
• W2023863464 title "The [(G/C)3NN]n motif: a common DNA repeat that excludes nucleosomes." @default.
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• W2023863464 doi "https://doi.org/10.1073/pnas.93.17.8863" @default.
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