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Related Experiment Videos

Spontaneous sharp bending of double-stranded DNA.

Timothy E Cloutier1, Jonathan Widom

  • 1Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, IL 60208, USA.

Molecular Cell
|May 6, 2004
PubMed
Summary

DNA spontaneously bends into circles, challenging previous theories. This finding reveals DNA

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Sharply bent DNA is crucial for gene regulation in prokaryotes, eukaryotic nucleosomes, and viruses.
  • Existing theories attribute DNA bending to external forces exerted by proteins, assuming DNA's inherent inflexibility.

Purpose of the Study:

  • To investigate the intrinsic bending capabilities of DNA, particularly in forming looped structures.
  • To challenge the conventional understanding of DNA bending mechanisms and the role of proteins.

Main Methods:

  • Experimental analysis of 94 bp DNA fragments, comparable in length to in vivo looped DNA.
  • Observation of spontaneous circularization of naked DNA under various conditions.
  • Comparison of cyclization efficiency for random DNA sequences versus nucleosome-positioning sequences.

Main Results:

  • DNA fragments of 94 bp spontaneously bend into circular structures without external protein forces.
  • Naked DNA readily forms loops, with proteins enhancing loop stability but not initiating it.
  • Random DNA sequences cyclize 10^2–10^4 times more readily than predicted, and nucleosome-positioning sequences cyclize up to 10^5 times more readily.

Conclusions:

  • DNA is an active participant in forming looped regulatory complexes in vivo.
  • Current theories of DNA bending are insufficient and require revision to account for DNA's intrinsic bending.
  • The spontaneous looping of DNA has significant implications for gene regulation and DNA packaging.

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