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Related Experiment Videos

Dissecting the resolution reaction of lambda integrase using suicide Holliday junction substrates

S H Kho1, A Landy

  • 1Division of Biology and Medicine, Brown University, Providence, RI 02912.

The EMBO Journal
|June 1, 1994
PubMed
Summary

Researchers developed novel synthetic suicide Holliday junctions to study DNA strand cleavage. These junctions revealed that additional Int recombinase proteins enhance Holliday junction resolution by increasing cleavage rates, not coordination.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Holliday junctions are key intermediates in DNA recombination.
  • Int recombinases uniquely process Holliday junctions, performing both formation and resolution.
  • Previous studies were limited to reciprocal strand exchanges, hindering analysis of individual cleavage events.

Purpose of the Study:

  • To design and utilize synthetic suicide Holliday junctions for monitoring individual DNA strand cleavage events.
  • To investigate the mechanism of Holliday junction resolution by Int recombinases.
  • To elucidate the role of accessory Int proteins in stimulating resolution.

Main Methods:

  • Design of synthetic suicide Holliday junction substrates with a pre-existing nick.
  • Utilizing these substrates to trap covalent protein-DNA intermediates.

Related Experiment Videos

  • Analyzing the impact of additional Int proteins on cleavage and resolution rates.

    • Main Results:

    • Synthetic suicide Holliday junctions enable monitoring of single DNA strand cleavage events.
    • Holliday junction resolution is stimulated by additional 'cross-core' Int proteins.
    • This stimulation is attributed to enhanced cleavage rates, not improved coordination of cleavage.

    Conclusions:

    • The developed suicide Holliday junction substrates are valuable tools for studying DNA strand cleavage mechanisms.
    • Accessory Int proteins play a critical role in promoting Holliday junction resolution by increasing cleavage efficiency.
    • This work provides insights into the mechanistic details of site-specific recombination.