RPA physically interacts with the human DNA glycosylase NEIL1 to regulate excision of oxidative DNA base damage in primer-template structures |
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| Authors: | Corey A Theriot Muralidhar L Hegde Tapas K Hazra Sankar Mitra |
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| Institution: | 1. Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States;2. Department of Internal Medicine, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States;1. Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA 02129, USA;2. Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA;3. Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA;1. Department of Genetics, Harvard Medical School; Division of Genetics, Brigham and Women’s Hospital; Howard Hughes Medical Institute, Boston, MA 02115, USA;2. Department of Radiation Oncology, Massachusetts General Hospital, Boston, MA 02114, USA;3. Department of Medicine and Cancer Research Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA;4. Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA;2. Physics Department, Kent State University, Kent, Ohio;3. Biological Sciences Department, Kent State University, Kent, Ohio;4. Department of Genetics and Bioengineering, Fatih University, Istanbul, Turkey;2. Department of Experimental Radiation Oncology, University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA |
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| Abstract: | The human DNA glycosylase NEIL1, activated during the S-phase, has been shown to excise oxidized base lesions in single-strand DNA substrates. Furthermore, our previous work demonstrating functional interaction of NEIL1 with PCNA and flap endonuclease 1 (FEN1) suggested its involvement in replication-associated repair. Here we show interaction of NEIL1 with replication protein A (RPA), the heterotrimeric single-strand DNA binding protein that is essential for replication and other DNA transactions. The NEIL1 immunocomplex isolated from human cells contains RPA, and its abundance in the complex increases after exposure to oxidative stress. NEIL1 directly interacts with the large subunit of RPA (Kd ～20 nM) via the common interacting interface (residues 312–349) in NEIL1's disordered C-terminal region. RPA inhibits the base excision activity of both wild-type NEIL1 (389 residues) and its C-terminal deletion CΔ78 mutant (lacking the interaction domain) for repairing 5-hydroxyuracil (5-OHU) in a primer-template structure mimicking the DNA replication fork. This inhibition is reduced when the damage is located near the primer-template junction. Contrarily, RPA moderately stimulates wild-type NEIL1 but not the CΔ78 mutant when 5-OHU is located within the duplex region. While NEIL1 is inhibited by both RPA and Escherichia coli single-strand DNA binding protein, only inhibition by RPA is relieved by PCNA. These results showing modulation of NEIL1's activity on single-stranded DNA substrate by RPA and PCNA support NEIL1's involvement in repairing the replicating genome. |
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