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DNA double-crossover molecules

T J Fu1, N C Seeman

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

Biochemistry
|April 6, 1993
PubMed
Summary
This summary is machine-generated.

This study modeled DNA double-crossover molecules, finding antiparallel structures more stable than parallel ones for recombination. Parallel DNA structures require shielding or distortion to function in recombination processes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • DNA recombination is crucial for genetic diversity and repair.
  • Double-strand break repair pathways often involve intermediate structures with crossovers.
  • Understanding the structural and dynamic properties of these intermediates is key to elucidating recombination mechanisms.

Purpose of the Study:

  • To model and analyze DNA molecules with two crossover sites between helical domains.
  • To investigate the stability and behavior of different classes of double-crossover DNA structures.
  • To assess the implications of these structures for DNA recombination processes.

Main Methods:

  • Oligonucleotide system modeling of double-crossover DNA structures.
  • Classification of molecules into parallel (DP) and antiparallel (DA) orientations, and by half-turn separations (odd/even).

Related Experiment Videos

  • Native polyacrylamide gel electrophoresis and hydroxyl radical autofootprinting for structural and stability analysis.

    • Main Results:

    • Antiparallel double-crossover DNA molecules exhibited stable, single bands on gels, unlike parallel molecules which dissociated or formed multimers.
    • Hydroxyl radical autofootprinting indicated generally linear and coplanar helix axes in antiparallel structures.
    • Certain parallel structures (DPOW, DPE with 2 turns) showed helix bowing, suggesting charge repulsion, and parallel molecules were less stable overall.

    Conclusions:

    • Antiparallel double-crossover DNA structures are more stable and well-behaved than parallel ones.
    • Parallel double-crossover helices likely require shielding or distortion to participate effectively in recombination.
    • Sequence symmetry requirements differ for branch migration in parallel versus antiparallel DNA structures.