期刊
JOURNAL OF MOLECULAR BIOLOGY
卷 342, 期 5, 页码 1391-1402出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2004.07.080
关键词
chromatin; nucleosome core particle; transcription factor; ternary complex; FRET
资金
- NIGMS NIH HHS [R01 GM061909, GM61909] Funding Source: Medline
Here, we study the binding of the transcription factor Amt1 to its recognition site near the dyad of a highly positioned nucleosome. We find that the DNA binding domain of Amt1 binds to nucleosomes with only threefold reduced affinity compared to free DNA. We show by fluorescence resonance energy transfer that factor binding at the nucleosomal dyad is accompanied by the partial dissociation of the DNA ends from the histone octamer surface; however, no dissociation or subtle rearrangements of histone subunits is observed. A poly(dA (.) dT) DNA sequence element adjacent to the transcription factor binding site appears to facilitate factor binding, but is not essential. The methods that we describe here characterize for the first time the subtle structural changes that occur upon transcription factor binding to nucleosomes, and demonstrate the ability of the nucleosome to structurally adapt in response to outside influences. (C) 2004 Elsevier Ltd. All rights reserved.
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