Abstract
APE1 (apurinic/apyrimidinic endodeoxyribonuclease 1) is a central enzyme of the base excision repair (BER) pathway playing a pivotal role in protecting mammalian cells against genotoxins and in safeguarding genome stability. Recently, we demonstrated the APE1 ability to process abasic ribonucleotides embedded in DNA. Here, we provide a pipeline of protocols to quantify endodeoxyribonuclease activity by APE1 on these substrates, by using recombinant protein and whole-cell extracts. The repair capacity is measured by using fluorescent oligonucleotide substrates, which are then separated by polyacrylamide gel electrophoresis and detected by imaging scanning. The specificity of APE1 action is demonstrated using specific APE1 enzymatic inhibitors.
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References
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Acknowledgements
The authors thank all the members of the GT lab for constructive feedback during the development of this work. GT is supported by a grant from the Associazione Italiana per la Ricerca sul Cancro (IG19862).
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Malfatti, M.C., Antoniali, G., Tell, G. (2023). In Vitro Assay to Measure APE1 Enzymatic Activity on Ribose Monophosphate Abasic Site. In: Bhakat, K.K., Hazra, T.K. (eds) Base Excision Repair Pathway. Methods in Molecular Biology, vol 2701. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3373-1_2
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DOI: https://doi.org/10.1007/978-1-0716-3373-1_2
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