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. 1995 Aug;15(8):4375–4384. doi: 10.1128/mcb.15.8.4375

Accessibility of a glucocorticoid response element in a nucleosome depends on its rotational positioning.

Q Li 1, O Wrange 1
PMCID: PMC230677  PMID: 7623832

Abstract

Gene expression requires binding of transcription factors to their cognate DNA response elements, the latter being often integrated into sequence-specifically positioned nucleosomes. To investigate the constraints imposed on factor-DNA recognition by the nucleosomal organization, we studied the binding of glucocorticoid receptor to a single glucocorticoid response element (GRE) displaying four different rotational frames in three different translational positions in reconstituted nucleosomes. We demonstrate that rotational setting of the GRE per se is important for its accessibility. Furthermore, the effects of rotational positioning of the GRE are different for different translational positions of the GRE in the nucleosome. A GRE placed near the nucleosomal dyad is totally blocked by rotating it 180 degrees so that the major groove of the GRE faces the histone octamer. If, on the other hand, the GRE is placed about 40 bp from the nucleosome dyad, then the 180 degrees rotation of the GRE still allows glucocorticoid receptor binding, albeit with a sixfold lower affinity than the peripherally oriented GRE. This suggests that both the rotational positioning and the translational positioning function as a framework for transcription factor response elements in gene regulation.

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Selected References

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