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Related Experiment Videos

Structural dynamics of individual Holliday junctions.

Sean A McKinney1, Anne-Cécile Déclais, David M J Lilley

  • 1Physics department, University of Illinois, Urbana-Champaign, 61801, USA.

Nature Structural Biology
|December 24, 2002
PubMed
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Single-molecule methods reveal dynamic transitions in the four-way DNA (Holliday) junction, a key intermediate in genetic recombination. These findings clarify how DNA sequence influences conformational changes and genetic exchange.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • The four-way DNA (Holliday) junction is crucial for genetic recombination.
  • Its dynamic conformational states and transitions are poorly understood.
  • Conventional bulk methods cannot resolve these dynamic processes.

Purpose of the Study:

  • To investigate the dynamic conformational transitions of the Holliday junction.
  • To elucidate the role of these dynamics in branch migration and genetic exchange.

Main Methods:

  • Utilized single-molecule fluorescence methodology to detect conformational transitions.
  • Analyzed sequence dependence and counterion effects.
  • Measured energetic barriers for transitions and branch migration.

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Main Results:

  • Detected transitions between alternative stacking conformers of the Holliday junction.
  • Identified an unstacked, open structure as a common intermediate for conformer transition and branch migration.
  • Conformer transitions occur multiple times during branch migration, enabling conformational equilibrium.

Conclusions:

  • Holliday junction dynamics involve transitions through an open intermediate.
  • Sequence-dependent conformational bias can influence the extent of genetic exchange.
  • Provides a mechanistic link between junction dynamics and recombination outcomes.