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Direct evidence for Holliday junction crossover isomerization

X Li1, H Wang, N C Seeman

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

Biochemistry
|April 8, 1997
PubMed
Summary
This summary is machine-generated.

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Holliday junctions spontaneously switch crossover isomers in solution, a key step in genetic recombination. This crossover isomerization changes recombination products from patch to splice types.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Holliday junctions are crucial four-stranded branched DNA structures in genetic recombination.
  • Crossover isomerization, a postulated reversal of strand roles, is key to generating different recombinant products (patch vs. splice).

Purpose of the Study:

  • To provide direct evidence for spontaneous crossover isomerization of Holliday junctions in solution.
  • To investigate the role of this isomerization in genetic recombination outcomes.

Main Methods:

  • Construction of a constrained double-crossover molecule containing a Holliday junction.
  • Release of the Holliday junction via restriction endonuclease digestion.
  • Hydroxyl radical autofootprinting to detect changes in junction conformation.

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Main Results:

  • Direct evidence shows Holliday junctions spontaneously change crossover isomers upon release from the double-crossover molecule.
  • Experimental controls confirmed the protocol, dissociation, or molecular interactions did not cause isomerization.
  • Crossover isomerization occurs authentically and spontaneously in solution.

Conclusions:

  • Crossover isomerization is a genuine, spontaneous transformation of Holliday junctions.
  • This reaction is a fundamental process influencing the outcomes of genetic recombination.