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Analyzing and Building Nucleic Acid Structures with 3DNA
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Published on: April 26, 2013

Dynamic structures of Bacillus subtilis RecN-DNA complexes.

Humberto Sanchez1, Paula P Cardenas, Shige H Yoshimura

  • 1Departamento de Biotecnología Microbiana, Centro Nacional de Biotecnología, CSIC, Campus Universidad Autónoma de Madrid, Darwin 3, Cantoblanco, 28049 Madrid, Spain.

Nucleic Acids Research
|November 15, 2007
PubMed
Summary

This study explores how the protein RecN interacts with DNA in Bacillus subtilis during DNA repair. Using atomic force microscopy, the researchers found that ATP changes the structure of RecN-DNA complexes and helps them assemble. These complexes can form large structures that are not affected by another protein called SsbA. However, when RecA is present, it removes RecN from DNA ends and stops RecA from forming large networks. The researchers propose that RecN helps gather DNA ends in one place, making it easier for RecA to find matching DNA segments. This could be an important step in DNA repair and recombination.

Keywords:
RecN proteinDNA repairhomologous recombinationatomic force microscopy

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Area of Science:

  • Molecular biology of DNA repair
  • Structural biology of recombination proteins
  • Microbial genetics and genomics

Background:

Homologous recombination plays a central role in DNA repair, especially for double-strand breaks. Bacillus subtilis RecN has been linked to this process, but its exact function remains unclear. Prior research has shown that RecN is involved in DNA repair centers and interacts with ssDNA. However, the structural dynamics of RecN-DNA complexes are not well characterized. Understanding RecN’s behavior could clarify its role in recombination. The mechanisms of RecN assembly and interaction with other proteins are still under investigation. RecN’s interaction with RecA and SsbA is of particular interest. This gap motivated a structural and functional analysis of RecN-ssDNA complexes.

Purpose Of The Study:

This study aimed to investigate the architecture of RecN-ssDNA complexes using atomic force microscopy. The researchers wanted to determine how ATP influences RecN complex formation. They also sought to understand how RecN interacts with other proteins like RecA and SsbA. The goal was to clarify the role of RecN in DNA repair and recombination. The study focused on the structural changes in RecN-ssDNA complexes. The researchers hypothesized that RecN might facilitate RecA access to DNA ends. They aimed to test whether RecN promotes the formation of DNA repair centers. The study aimed to provide a structural basis for RecN’s function in DNA repair.

Main Methods:

The researchers used atomic force microscopy to visualize RecN-ssDNA complexes. They examined the effects of ATP on RecN complex architecture. The study included experiments on inter-complex assembly and local DNA end concentration. They tested the impact of SsbA and RecA on RecN-ssDNA interactions. The experiments were conducted under controlled biochemical conditions. The researchers analyzed the structural changes in RecN-ssDNA complexes. They observed how RecA affects RecN binding to DNA overhangs. The study also assessed how RecN influences RecA network formation.

Main Results:

ATP significantly alters the architecture of RecN-ssDNA complexes. The addition of ATP promotes inter-complex assembly and increases DNA end concentration. RecN forms large CII and CIII complexes in the presence of ATP. These complexes are not affected by SsbA addition. RecA induces the dislodging of RecN from DNA overhangs. In the presence of RecN, RecA fails to form large DNA networks. The study shows that RecN tethers 3'-ssDNA ends in an ATP-dependent manner. The results suggest that RecN enhances RecA access to DNA ends.

Conclusions:

The findings suggest that RecN functions as a tether for 3'-ssDNA ends in an ATP-dependent manner. RecN appears to facilitate the local concentration of DNA ends, which may aid in homologous recombination. The study shows that RecN and RecA have reciprocal effects on each other’s assembly. RecN’s role in promoting RecA access to DNA ends is supported by the data. The results indicate that RecN may help initiate the homology search process. The formation of large RecN complexes is not affected by SsbA. The study supports the hypothesis that RecN acts before and after DNA end processing. The authors propose that RecN plays a role in the assembly of DNA repair centers.

ATP induces structural changes in RecN-ssDNA complexes and promotes inter-complex assembly.

RecA dislodges RecN from DNA overhangs and prevents the formation of large RecA networks in the presence of RecN.

The study found that these complexes remain stable even when SsbA is added, suggesting a distinct interaction mechanism.

Tethering may increase the local concentration of DNA ends, facilitating RecA access and homology search.

RecN prevents the formation of large RecA-DNA networks, suggesting a regulatory role in recombination.

The authors suggest that RecN tethers DNA ends and promotes RecA access, aiding in homology search and repair.