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Sequence dependence of branch migratory minima

W Sun1, C Mao, F Liu

  • 1Department of Chemistry, New York University, New York, NY 10003, USA.

Journal of Molecular Biology
|September 12, 1998
PubMed
Summary
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Branch migration in genetic recombination is not always sequence-independent. Flanking sequences significantly impact the free energy of Holliday junction branch migration, revealing enthalpy-entropy compensation.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Holliday junctions are key intermediates in genetic recombination.
  • Branch migration, an isomerization of the Holliday junction, is driven by flanking homology.
  • Existing models assume sequence-independent branch migration kinetics.

Purpose of the Study:

  • To test the assumption of sequence-independence in branch migration kinetics.
  • To quantify the effect of flanking sequences on branch migration free energy.

Main Methods:

  • Utilized a competition assay with symmetric immobile branched junctions.
  • Ensured strand displacement non-association for assay validity.
  • Measured free energy changes for branch migration across various dimeric symmetric sequences.

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Main Results:

  • The assumption of sequence-independence for branch migration is not universally true.
  • Flanking sequences demonstrably affect the measured free energy.
  • Enthalpy and entropy contributions vary, indicating enthalpy-entropy compensation.

Conclusions:

  • Flanking sequence composition is a critical factor in Holliday junction branch migration.
  • This finding necessitates refinement of models for genetic recombination kinetics.
  • Enthalpy-entropy compensation is a relevant thermodynamic principle in this system.