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Related Experiment Videos

Sequence-dependent kinks induced in curved DNA.

P T McNamara1, A Bolshoy, E N Trifonov

  • 1Department of Biochemistry, University of Nevada, Reno 89557.

Journal of Biomolecular Structure & Dynamics
|December 1, 1990
PubMed
Summary
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DNA structural transitions were observed in curved DNA fragments, suggesting thermally induced kinks at specific sequences stabilize DNA structure and may act as recognition elements.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • Curved DNA fragments exhibit gel retardation anomalies.
  • These anomalies suggest length-dependent structural transitions occur in DNA.

Purpose of the Study:

  • To investigate the nature of structural transitions in curved DNA fragments.
  • To identify the specific DNA sequences associated with these transitions.
  • To explore the potential role of these transitions as protein-DNA recognition elements.

Main Methods:

  • Gel electrophoresis was used to study DNA fragments of varying lengths.
  • Analysis of gel retardation anomalies to infer structural changes.
  • Sequence analysis to identify specific dinucleotide stacks at transition sites.

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Main Results:

  • A maximum in the gel retardation anomaly was observed with increasing fragment length.
  • This anomaly indicates length- and electric field-dependent structural transitions.
  • Thermally induced stereochemical kinks, stabilized in the gel, were identified at CA/TG and TA/TA dinucleotide stacks.
  • These kinks are reversible and sequence-dependent.

Conclusions:

  • The study identifies novel sequence-dependent structural transitions in curved DNA.
  • These transitions, involving kinks at CA/TG and TA/TA steps, relieve DNA curvature effects.
  • These reversible kinks represent a potential new class of structural elements for protein-DNA recognition.