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Updated: Jul 15, 2026

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
Published on: February 13, 2019
Homology-driven chromatin remodeling by human RAD54
Zhaoqing Zhang1, Hua-Ying Fan, Joseph A Goldman
1Department of Molecular Biology, Massachusetts General Hospital and Department of Genetics, Harvard Medical School, 185 Cambridge Street, Boston, Massachusetts 02114, USA.
Human RAD51 and RAD54 proteins facilitate DNA repair through homologous recombination. RAD54 protein remodeling of chromatin is essential for RAD51-mediated strand invasion, a crucial step in DNA double-strand break repair.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Homologous recombination is a critical DNA repair pathway.
- RAD51 and RAD54 proteins are essential for homologous recombination.
- Chromatin remodeling is implicated in DNA repair processes.
Purpose of the Study:
- To investigate the role of RAD54 in chromatin remodeling during homologous recombination.
- To determine the mechanism by which RAD51-ssDNA interacts with RAD54 for chromatin remodeling.
- To analyze the impact of RAD54 mutations on its function in DNA repair.
Main Methods:
- In vitro chromatin reconstitution systems.
- Biochemical assays to study protein-DNA interactions.
- Analysis of RAD54 mutants.
Main Results:
- RAD51-ssDNA stimulates RAD54-dependent chromatin remodeling in a homology-dependent manner.
- RAD54-mediated chromatin remodeling facilitates RAD51-ssDNA strand invasion on nucleosomal templates.
- RAD54B and other remodelers did not show similar stimulation.
- RAD54 mutants exhibited defects in remodeling or RAD51 interaction.
Conclusions:
- RAD54 is recruited by RAD51-ssDNA filaments to chromatin for remodeling.
- Chromatin remodeling by RAD54 enhances accessibility for strand exchange during homologous recombination.
- Dysfunctional RAD54 may contribute to cancer development.
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