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Structure of the single-stranded-DNA-binding domain of replication protein A bound to DNA

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Abstract

THE single-stranded-DNA-binding proteins (SSBs) are essential for DNA function in prokaryotic and eukaryotic cells, mitochondria, phages and viruses1,2. The structures of four SSBs have been solved3–7, but the molecular details of the interaction of SSBs with DNA remain speculative. We report here the crystal structure at 2.4 Å resolution of the single-stranded-DNA-binding domain of human replication protein A (RPA) bound to DNA. Replication protein A is a heterotrimeric SSB that is highly conserved in eukaryotes. The largest subunit, RPA70, binds to single-stranded (ss)DNA8,9 and mediates interactions with many cellular and viral proteins10. The DNA-binding domain, which lies in the middle of RPA70, comprises two structurally homologous sub-domains oriented in tandem. The ssDNA lies in a channel that extends from one subdomain to the other. The structure of each RPA70 subdomain is similar to those of the bacteriophage SSBs, indicating that the mechanism of ssDNA-binding is conserved.

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Authors and Affiliations

  1. Institute for Molecular Biology and Biotechnology, Cancer Research Group, McMaster University, 1200 Main St. W., Hamilton, Ontario, L8N 3Z5, Canada

    Alexey Bochkarev, Richard A. Pfuetzner, Aled M. Edwards & Lori Frappier

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  1. Alexey Bochkarev
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  2. Richard A. Pfuetzner
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  3. Aled M. Edwards
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  4. Lori Frappier
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Bochkarev, A., Pfuetzner, R., Edwards, A. et al. Structure of the single-stranded-DNA-binding domain of replication protein A bound to DNA. Nature 385, 176–181 (1997). https://doi.org/10.1038/385176a0

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  • DOI: https://doi.org/10.1038/385176a0

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