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Holliday junction dynamics and branch migration: single-molecule analysis.

Mikhail Karymov1, Douglas Daniel, Otto F Sankey

  • 1School of Life Sciences, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 27, 2005
PubMed
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Researchers directly observed Holliday junction (HJ) branch migration in real-time, revealing a stepwise process influenced by Mg2+ concentration. This finding offers new insights into DNA recombination mechanisms.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • The Holliday junction (HJ) is a critical intermediate in homologous recombination, site-specific recombination, and DNA replication.
  • Branch migration, a key step in DNA recombination, facilitates the exchange of homologous DNA regions but its mechanism remains poorly understood.

Purpose of the Study:

  • To directly detect and characterize the mechanism of branch migration in individual Holliday junction molecules in real-time.
  • To elucidate the role of Mg2+ concentration and conformational dynamics in regulating HJ branch migration.

Main Methods:

  • Development of specifically designed Holliday junction constructs for single-molecule analysis.
  • Real-time detection of branch migration at the single-molecule level.

Related Experiment Videos

  • Theoretical modeling to analyze the mechanism of HJ branch migration.

    • Main Results:

    • Branch migration was observed as a stepwise, random process, with kinetics dependent on Mg2+ concentration.
    • Holliday junctions were found to flip between conformations that favor and disfavor branch migration.
    • In the favorable extended HJ geometry, branch migration occurred in large, single steps over several base pairs.

    Conclusions:

    • Magnesium ions (Mg2+) stabilize folded conformations, significantly prolonging the pause in branch migration.
    • The observed conformational flipping and variable base pair hopping provide crucial insights into the regulation of genetic processes involving Holliday junctions.
    • This study offers a detailed mechanistic understanding of Holliday junction branch migration at the single-molecule level.