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Replication Protein A Confers Structure-specific Endonuclease Activities to the XPF-ERCC1 and XPG Subunits of Human DNA Repair Excision Nuclease

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Matsunaga, Tsukasa, Park, Chi-Hyun, Bessho, Tadayoshi, Mu, David, Sancar, Aziz·1996·Journal of Biological Chemistry

Abstract

XPF-ERCC1 and XPG proteins are nucleases that are involved in human nucleotide excision repair. In this study, we characterized the structure-specific junction-cutting activities of both nucleases using DNA substrates containing a bubble or loop structure. We found that the junction-cutting activities of XPF-ERCC1 and XPG were greatly stimulated by human replication protein A (RPA), while heterologous single-stranded DNA-binding proteins could not substitute for human RPA. To test for specific interaction between RPA and XPF-ERCC1 as is known to occur between RPA and XPG, we employed a pull-down assay with immobilized "bubble" substrate. We found that the binding of XPF-ERCC1 complex to the bubble substrate was enhanced by RPA, suggesting a possible mechanism for RPA in the excision nuclease system, that is the targeting of the nuclease subunits to their specific sites of action. Furthermore, the RPA-promoted junction cutting by XPF-ERCC1 and XPG nucleases was observed with "loop" substrates as well, raising the possibility that XPF-ERCC1, XPG, and RPA may function in removing loop structures from DNA, independent of the other subunits of the human excinuclease.

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Metadata

Authors
Matsunaga, T., Park, C.-H., Bessho, T., Mu, D., & Sancar, A.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1996-05
Volume
271
Issue
19
Pages
11047-11050
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2062028908
Cited by
190
References
5
FWCI
6.93
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Replication Protein A Confers Structure-specific Endonuclease Activities to the XPF-ERCC1 and XPG Subunits of Human DNA Repair Excision Nuclease. https://app.cochat.ai/papers/10.1074/jbc.271.19.11047
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Matsunaga, T., Park, C.-H., Bessho, T., Mu, D., & Sancar, A. (1996). Replication Protein A Confers Structure-specific Endonuclease Activities to the XPF-ERCC1 and XPG Subunits of Human DNA Repair Excision Nuclease. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.271.19.11047

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