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Related Experiment Videos

Nucleosome positioning determinants.

Alfonso G Fernandez1, John N Anderson

  • 1Department of Biological Sciences, Purdue University, West Lafayette, IN 47907-1392, USA.

Journal of Molecular Biology
|June 26, 2007
PubMed
Summary
This summary is machine-generated.

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Local DNA structures, particularly TA steps, are crucial for nucleosome positioning and stability. Specific DNA sequences and flanking regions significantly impact genomic functions dependent on ordered nucleosomes.

Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • Nucleosome positioning sequences are essential for regulating DNA accessibility and gene expression.
  • Previous studies identified a permanganate-hypersensitive site in Fragment 67, crucial for nucleosome positioning.
  • This site is located 1.5 turns from the dyad, a region of high DNA curvature.

Purpose of the Study:

  • To investigate nucleosome positioning sequences for potassium permanganate (KMnO(4)) hypersensitive sites.
  • To expand the dataset of DNA sequences exhibiting nucleosome positioning activity.
  • To assess the significance of specific DNA sequence motifs, like TA steps, in nucleosome stability and positioning.

Main Methods:

  • Examined the permanganate sensitivity of the nucleosome positioning Fragment 601.

Related Experiment Videos

  • Identified and analyzed hyperreactive T residues within TA steps in various DNA sequences.
  • Assessed nucleosome stability and positioning by replacing DNA fragments and introducing single base-pair substitutions.

    • Main Results:

    • Identified multiple TA steps as containing hyperreactive T residues, suggesting their role in nucleosome positioning.
    • Found that sequences with TA steps, particularly CTAGPuG and TTAAPu motifs, promote high nucleosome stability and positioning.
    • Demonstrated that the TA step is critical, with stability following the order TA>TG>TT>/=TC approximately GG approximately GA approximately AT.
    • Flanking sequences and DNA kinking structures, like slipped stranded structures and single base bulges, also significantly influence nucleosome positioning.

    Conclusions:

    • Local DNA structures, especially TA steps, are critical determinants of nucleosome stability and positioning.
    • Specific DNA sequence motifs and flanking regions play a significant role in organizing nucleosomes.
    • Alterations in these DNA sequences can profoundly affect genomic functions reliant on ordered nucleosomes.