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Srs2 promotes Mus81-Mms4-mediated resolution of recombination intermediates
Melita Chavdarova1, Victoria Marini2, Alexandra Sisakova3
1Department of Biology, Masaryk University, Kamenice 5/A7, Brno 625 00, Czech Republic National Centre for Biomolecular Research, Masaryk University, Kamenice 5/A4, Brno 625 00, Czech Republic.
Nucleic Acids Research
|March 14, 2015
Summary
The Srs2 helicase and Mus81-Mms4 endonuclease physically interact to maintain genomic stability. Srs2 stimulates Mus81-Mms4 activity by removing Rad51, coordinating DNA repair processes.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Replication fork stalling due to DNA damage threatens genomic stability.
- Mus81-Mms4 endonuclease and Srs2 helicase are implicated in DNA repair pathways.
Purpose of the Study:
- To investigate the physical interaction and functional relationship between Srs2 and Mus81-Mms4.
- To elucidate the roles of Srs2 and Mus81-Mms4 in processing DNA replication and recombination intermediates.
Main Methods:
- In vitro and in vivo protein interaction assays.
- Mapping of protein interaction domains.
- Biochemical assays to assess nuclease and helicase activities.
Main Results:
- Srs2 and Mus81-Mms4 physically interact, with mapped interaction domains.
- Srs2 stimulates Mus81-Mms4 nuclease activity independently of its helicase function.
- Srs2 facilitates Mus81-Mms4 DNA cleavage by removing Rad51.
- Mus81-Mms4 inhibits Srs2 helicase activity.
Conclusions:
- Srs2 and Mus81-Mms4 function in a coordinated manner to process DNA recombination and replication intermediates.
- This interaction is crucial for maintaining genomic stability.
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