DNA-protein cross-links (DPCs) are super-bulky, helix-distorting DNA lesions that result from exposure to a variety of chemical and physical agents such as antitumor drugs, environmental/ occupational toxins, ionizing radiation, and endogenous free radical-generating systems. Due to their unusually bulky nature, DPCs are hypothesized to interfere with normal DNA-protein interactions required for DNA replication, transcription, and repair, potentially leading to mutagenesis, genotoxicity, and cytotoxicity. However, the biological outcomes of DPC lesions in cells are poorly understood because of their inherent structural complexity and the difficulty of generating DNA substrates containing structurally defined DPC for biological evaluation. Our long-term goal is to elucidate the role tha spontaneous and induced DPCs play in human disease and in the anticancer activity of common chemotherapeutic agents. The objectives of this application are to determine the biological consequences of DPC formation in human cells and to discover the mechanism(s) responsible for the removal of DPCs from DNA. Our studies will for the first time systematically examine the influence of DPCs on DNA repair and replication. Our central hypothesis is that, if not repaired, DPCs exert mutagenic and cytotoxic effects, significantly contributing to the biological effects of many known carcinogens and antitumor drugs. Collectively, these studies will provide significant new insights into the molecular and cellular biology of DPCs and are expected to fundamentally advance the fields of DNA repair, cancer biology, and molecular mechanisms of aging.

Public Health Relevance

Exposure to certain anticancer drugs, environmental pollutants, and chemicals naturally produced in the body can cause proteins to become trapped on DNA. The resulting DNA-protein cross-links, if not repaired, can have toxic effects or lead to cancer, aging, and heart disease. The goals of this project are to understand how human cells cope with DNA-protein cross-links.

National Institute of Health (NIH)
National Institute of Environmental Health Sciences (NIEHS)
Research Project (R01)
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Special Emphasis Panel (ZRG1-OBT-S (02))
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Shaughnessy, Daniel
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University of Minnesota Twin Cities
Internal Medicine/Medicine
Schools of Medicine
United States
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Yang, Kun; Park, Daeyoon; Tretyakova, Natalia Y et al. (2018) Histone tails decrease N7-methyl-2'-deoxyguanosine depurination and yield DNA-protein cross-links in nucleosome core particles and cells. Proc Natl Acad Sci U S A 115:E11212-E11220
Pujari, Suresh S; Zhang, Yi; Ji, Shaofei et al. (2018) Site-specific cross-linking of proteins to DNA via a new bioorthogonal approach employing oxime ligation. Chem Commun (Camb) 54:6296-6299
Chesner, Lisa N; Campbell, Colin (2018) A quantitative PCR-based assay reveals that nucleotide excision repair plays a predominant role in the removal of DNA-protein crosslinks from plasmids transfected into mammalian cells. DNA Repair (Amst) 62:18-27
Groehler 4th, Arnold; Kren, Stefan; Li, Qinglu et al. (2018) Oxidative cross-linking of proteins to DNA following ischemia-reperfusion injury. Free Radic Biol Med 120:89-101
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Basu, Ashis K; Pande, Paritosh; Bose, Arindam (2017) Translesion Synthesis of 2'-Deoxyguanosine Lesions by Eukaryotic DNA Polymerases. Chem Res Toxicol 30:61-72
Zore, Omkar V; Pande, Paritosh; Okifo, Oghenenyerovwo et al. (2017) Nanoarmoring: strategies for preparation of multi-catalytic enzyme polymer conjugates and enhancement of high temperature biocatalysis. RSC Adv 7:29563-29574
Groehler 4th, Arnold; Degner, Amanda; Tretyakova, Natalia Y (2017) Mass Spectrometry-Based Tools to Characterize DNA-Protein Cross-Linking by Bis-Electrophiles. Basic Clin Pharmacol Toxicol 121 Suppl 3:63-77
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