Distinct RPA domains promote recruitment and the helicase-nuclease activities of Dna2

Ananya Acharya, Kristina Kasaciunaite, Martin Göse, Vera Kissling, Raphaël Guérois, Ralf Seidel and Petr Cejka ()
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Ananya Acharya: Università della Svizzera italiana (USI), Faculty of Biomedical Sciences
Kristina Kasaciunaite: Universität Leipzig
Martin Göse: Universität Leipzig
Vera Kissling: Eidgenössische Technische Hochschule (ETH)
Raphaël Guérois: Institute for Integrative Biology of the Cell (I2BC), Commissariat à l’Energie Atomique, CNRS, Université Paris-Sud, Université Paris-Saclay
Ralf Seidel: Universität Leipzig
Petr Cejka: Università della Svizzera italiana (USI), Faculty of Biomedical Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-15

Abstract: Abstract The Dna2 helicase-nuclease functions in concert with the replication protein A (RPA) in DNA double-strand break repair. Using ensemble and single-molecule biochemistry, coupled with structure modeling, we demonstrate that the stimulation of S. cerevisiae Dna2 by RPA is not a simple consequence of Dna2 recruitment to single-stranded DNA. The large RPA subunit Rfa1 alone can promote the Dna2 nuclease activity, and we identified mutations in a helix embedded in the N-terminal domain of Rfa1 that specifically disrupt this capacity. The same RPA mutant is instead fully functional to recruit Dna2 and promote its helicase activity. Furthermore, we found residues located on the outside of the central DNA-binding OB-fold domain Rfa1-A, which are required to promote the Dna2 motor activity. Our experiments thus unexpectedly demonstrate that different domains of Rfa1 regulate Dna2 recruitment, and its nuclease and helicase activities. Consequently, the identified separation-of-function RPA variants are compromised to stimulate Dna2 in the processing of DNA breaks. The results explain phenotypes of replication-proficient but radiation-sensitive RPA mutants and illustrate the unprecedented functional interplay of RPA and Dna2.

Date: 2021
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DOI: 10.1038/s41467-021-26863-y

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