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The human Shu complex promotes RAD51 activity by modulating RPA dynamics on ssDNA
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The human Shu complex promotes RAD51 activity by modulating RPA dynamics on ssDNA
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Journal Article
The human Shu complex promotes RAD51 activity by modulating RPA dynamics on ssDNA
2024
Overview
Templated DNA repair that occurs during homologous recombination and replication stress relies on RAD51. RAD51 activity is positively regulated by BRCA2 and the RAD51 paralogs. The Shu complex is a RAD51 paralog-containing complex consisting of SWSAP1 and SWS1. We demonstrate that SWSAP1-SWS1 binds RAD51, maintains RAD51 filament stability, and enables strand exchange. Using single molecule confocal fluorescence microscopy combined with optical tweezers, we show that SWSAP1-SWS1 decorates RAD51 filaments proficient for homologous recombination. We also find SWSAP1-SWS1 enhances RPA diffusion on ssDNA. Importantly, we show human
and
knockout cells are sensitive to pharmacological inhibition of PARP and APE1. Lastly, we identify cancer variants in SWSAP1 that alter SWS1 complex formation. Together, we show that SWSAP1-SWS1 stimulates RAD51-dependent high-fidelity repair and may be an important new cancer therapeutic target.
Publisher
Cold Spring Harbor Laboratory Press,Cold Spring Harbor Laboratory
