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Related Experiment Videos

Inhibitor analysis of synapsis by resolvase.

P M Flanagan1, M C Finn, M A Fennewald

  • 1Department of Biological Sciences, University of Notre Dame, Indiana 46556.

The Journal of Biological Chemistry
|October 5, 1989
PubMed
Summary
This summary is machine-generated.

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A novel inhibitor, A20832, blocks site-specific recombination by targeting the strand cleavage step. This inhibitor does not impede resolvase binding or synapse formation, offering new insights into DNA recombination mechanisms.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Site-specific recombination is a crucial process mediated by proteins like Tn3 resolvase.
  • Previous studies identified inhibitors affecting DNA binding or synapse formation.
  • Understanding recombination inhibitors aids in dissecting the molecular mechanisms involved.

Purpose of the Study:

  • To identify and characterize novel inhibitors of Tn3 resolvase-mediated site-specific recombination.
  • To elucidate the specific step in the recombination pathway targeted by the inhibitor A20832.

Main Methods:

  • Filter binding assays to assess protein-DNA interaction.
  • Synapse formation assays to evaluate protein complex assembly.
  • DNase I footprinting to determine DNA binding sites.

Related Experiment Videos

  • Analysis of recombination intermediates to pinpoint inhibition sites.

    • Main Results:

    • A20832 inhibits recombination post-synapse formation, specifically at the strand cleavage stage.
    • A20832 does not affect resolvase binding to the recombination (res) site or synapse formation.
    • DNase I analysis reveals that A20832 allows resolvase binding only to site I of the res site.

    Conclusions:

    • A20832 represents a new class of recombination inhibitors acting at the strand cleavage step.
    • The inhibitor provides a tool to dissect the later stages of the Tn3 resolvase-mediated recombination pathway.
    • Further studies with A20832 can illuminate the precise molecular events during DNA cleavage and strand exchange.