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Related Experiment Videos

Parallel and antiparallel Holliday junctions differ in structure and stability.

M Lu1, Q Guo, N C Seeman

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

Journal of Molecular Biology
|October 20, 1991
PubMed
Summary
This summary is machine-generated.

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Two synthetic DNA Holliday junction analogs, JA and JP, were studied to determine their structural and energetic differences. JA, with an antiparallel structure, is more stable than JP, with a parallel structure, by approximately 1.1-1.6 kcal/mol.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Holliday junctions are crucial four-way DNA structures involved in genetic recombination and repair.
  • Understanding the structural and energetic properties of Holliday junction analogs is essential for deciphering their biological roles.

Purpose of the Study:

  • To quantitatively assess the free energy difference between antiparallel (JA) and parallel (JP) Holliday junction analogs.
  • To investigate the structural distinctions between these analogs using enzymatic and chemical probes.

Main Methods:

  • Construction of two distinct Holliday junction analogs (JA and JP) using oligonucleotide synthesis and d(T)9 tethers.
  • Free energy difference determination via competition assays and thermal denaturation studies with urea.

Related Experiment Videos

  • Structural probing using DNase I, T7 endonuclease I, MPE.Fe(II), and (OP)2Cu(I).

    • Main Results:

    • Both methods indicated a small but significant free energy difference, with JA being more stable than JP (-1.1 to -1.6 kcal/mol).
    • Enzymatic and chemical cleavage patterns revealed distinct structural features around the branch point of JA and JP.
    • The branch point in both analogs showed enhanced binding of intercalating drugs.

    Conclusions:

    • The antiparallel configuration of JA confers greater stability compared to the parallel configuration of JP.
    • Structural differences exist between antiparallel and parallel Holliday junction analogs at the branch site.
    • The branch point of Holliday junctions serves as a key site for drug interaction.