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Molecular determinants of Smc5/6 association with DNA junctions
Jeremy T-H Chang1,2, Victoria Miller-Browne3,4, Gabriella N L Chua1,5
1Laboratory of Nanoscale Biophysics and Biochemistry, The Rockefeller University, New York, NY, USA.
Nature Communications
|January 17, 2026
Summary
The Smc5/6 complex binds DNA junctions crucial for genome maintenance. Its association is regulated by other factors, revealing insights into DNA repair mechanisms.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The Smc5/6 complex is vital for genome stability, interacting with various DNA forms.
- Its role in managing replication and repair intermediates highlights the need to understand its DNA binding mechanisms.
Purpose of the Study:
- To investigate the single-molecule interactions of the Smc5/6 complex with DNA junctions.
- To elucidate the factors influencing Smc5/6's association with specific DNA structures.
Main Methods:
- Single-molecule study of Smc5/6 complex.
- Utilized dsDNA substrate with a single-stranded DNA gap and defined 3' and 5' junctions.
- Investigated the effect of RPA and PCNA on Smc5/6 binding.
Main Results:
- Smc5/6 associates with both 3' and 5' DNA junctions.
- RPA presence favors Smc5/6 binding to the 3' junction.
- Non-SMC subcomplexes and Smc6 DNA-binding residues regulate Smc5/6 association and dwell time.
- Smc5/6 prefers junction sites without PCNA.
Conclusions:
- Smc5/6 employs multiple structural modules for junction association.
- Its binding is coordinated with other genome maintenance factors like RPA and PCNA.
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