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Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography
Published on: March 9, 2010
Isolation and detection of DNA-protein crosslinks in mammalian cells
Ignacio Torrecilla1, Annamaria Ruggiano1, Kostantin Kiianitsa2
1The MRC Weatherall Institute of Molecular Medicine, Department of Oncology, John Radcliffe Hospital, University of Oxford, Oxford, OX3 9DS, UK.
Abstract:
DNA-protein crosslinks (DPCs) are toxic DNA lesions wherein a protein is covalently attached to DNA. If not rapidly repaired, DPCs create obstacles that disturb DNA replication, transcription and DNA damage repair, ultimately leading to genome instability. The persistence of DPCs is associated with premature ageing, cancer and neurodegeneration. In mammalian cells, the repair of DPCs mainly relies on the proteolytic activities of SPRTN and the 26S proteasome, complemented by other enzymes including TDP1/2 and the MRN complex, and many of the activities involved are essential, restricting genetic approaches. For many years, the study of DPC repair in mammalian cells was hindered by the lack of standardised assays, most notably assays that reliably quantified the proteins or proteolytic fragments covalently bound to DNA. Recent interest in the field has spurred the development of several biochemical methods for DPC analysis. Here, we critically analyse the latest techniques for DPC isolation and the benefits and drawbacks of each. We aim to assist researchers in selecting the most suitable isolation method for their experimental requirements and questions, and to facilitate the comparison of results across different laboratories using different approaches.
Insights
DNA-protein crosslinks (DPCs) are harmful DNA lesions that can cause genome instability. This study reviews methods for isolating DPCs, aiding researchers in choosing the best techniques for DPC repair studies.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- DNA-protein crosslinks (DPCs) are toxic lesions where proteins covalently bind to DNA.
- Persistent DPCs impede DNA replication, transcription, and repair, leading to genome instability, premature aging, cancer, and neurodegeneration.
- Mammalian DPC repair involves SPRTN, the 26S proteasome, TDP1/2, and the MRN complex, but essentiality restricts genetic studies.
Purpose of the Study:
- To critically analyze recent biochemical methods for isolating DNA-protein crosslinks (DPCs).
- To guide researchers in selecting appropriate DPC isolation techniques based on experimental needs.
- To promote consistent and comparable results in DPC repair research across laboratories.
Main Methods:
- Review and critical analysis of current biochemical techniques for DPC isolation.
- Evaluation of the benefits and drawbacks of various DPC analysis methods.
- Focus on assays for quantifying proteins or proteolytic fragments covalently bound to DNA.
Main Results:
- Several biochemical methods for DPC analysis have recently been developed.
- Each method presents unique advantages and disadvantages for DPC isolation.
- Standardized assays for reliable DPC quantification were previously lacking.
Conclusions:
- The choice of DPC isolation method is crucial for successful experimental outcomes.
- Understanding the strengths and weaknesses of each technique facilitates research progress.
- Standardized approaches will improve the comparability of DPC repair studies.
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