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Related Experiment Videos

Mismatch-induced DNA unbending upon duplex opening.

Chongli Yuan1, Elizabeth Rhoades, Daniel M Heuer

  • 1School of Chemical and Biomolecular Engineering, Department of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.

Biophysical Journal
|August 9, 2005
PubMed
Summary

DNA structural changes, like bending and T-shape formation in three-way junctions (TWJs), alter gel mobility. These DNA-only conformational shifts mimic protein-induced changes, suggesting a basis for mismatch recognition.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • DNA duplexes can form complex structures like three-way junctions (TWJs) when branched.
  • Conformational changes in DNA influence its physical properties, such as electrophoretic mobility.

Purpose of the Study:

  • To investigate the conformational changes of DNA three-way junctions (TWJs) with and without base mismatches.
  • To correlate these structural changes with alterations in gel electrophoretic mobility.
  • To compare DNA-only conformational changes with protein-induced DNA structural modifications.

Main Methods:

  • Creation of asymmetric DNA three-way junctions (TWJs).
  • Gel electrophoresis to measure DNA mobility.
  • Fluorescence resonance energy transfer (FRET) experiments to confirm conformations.

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Main Results:

  • Opened DNA duplexes in TWJs exhibit a bent conformation (approx. 60 degrees), decreasing gel mobility.
  • Base mismatches at the opening site lead to a less bent, T-shaped DNA structure, increasing gel mobility.
  • Conformational changes observed in DNA TWJs resemble those induced by MutS protein binding.

Conclusions:

  • DNA structural rearrangements crucial for mismatch recognition can occur without protein involvement.
  • Gel electrophoretic mobility of DNA TWJs is sensitive to base mismatches and conformational changes.
  • Conformational flexibility of DNA TWJs plays a role in mismatch recognition mechanisms.