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Related Experiment Videos

Holliday junction resolution in human cells: two junction endonucleases with distinct substrate specificities.

Angelos Constantinou1, Xiao-Bo Chen, Clare H McGowan

  • 1Cancer Research UK, London Research Institute, Clare Hall Laboratories, South Mimms, Hertfordshire EN6 3LD, UK.

The EMBO Journal
|October 11, 2002
PubMed
Summary

Human cell extracts contain two nucleases that resolve DNA recombination intermediates. One nuclease resolves Holliday junctions, while the other, containing Mus81 protein, cleaves stalled replication forks.

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Area of Science:

  • Molecular biology
  • Biochemistry
  • Genetics

Background:

  • Holliday junctions are key intermediates in DNA recombination and replication restart.
  • Enzymatic resolution of these structures is crucial for genomic stability.

Purpose of the Study:

  • To identify and characterize nucleases involved in resolving human Holliday junctions.
  • To elucidate the distinct roles of these nucleases in DNA repair and replication.

Main Methods:

  • Analysis of human cell-free extracts for endonuclease activity.
  • Characterization of substrate specificity for identified nucleases.
  • Assocation of nucleases with branch migration and replication fork structures.

Main Results:

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  • Two distinct Holliday junction-cleaving endonucleases were identified in human extracts.
  • One nuclease functions with branch migration activity, producing ligatable products, similar to E. coli RuvABC.
  • The second nuclease, containing Mus81 protein, cleaves Holliday junctions and replication fork structures, yielding mostly non-ligatable products.

Conclusions:

  • Human cells possess multiple nucleases for resolving recombination and replication stress intermediates.
  • The Mus81-associated nuclease may play a critical role in resolving stalled replication forks and preventing fork collapse.