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Ionizing radiation, oxidative stress and endogenous DNA-damage processing can result in a variety of single-strand breaks with modified 5' and/or 3' ends. These are thought to be one of the most persistent forms of DNA damage and may threaten cell survival. This study addresses the mechanism involved in recognition and processing of DNA strand breaks containing modified 3' ends. Using a DNA-protein cross-linking assay, we followed the proteins involved in the repair of oligonucleotide duplexes containing strand breaks with a phosphate or phosphoglycolate group at the 3' end. We found that, in human whole cell extracts, end-damage-specific proteins (apurinic/apyrimidinic endonuclease 1 and polynucleotide kinase in the case of 3' ends containing phosphoglycolate and phosphate, respectively) which recognize and process 3'-end-modified DNA strand breaks are required for efficient recruitment of X-ray cross-complementing protein 1-DNA ligase IIIalpha heterodimer to the sites of DNA repair.

Original publication




Journal article



Publication Date





5753 - 5763


Aminopeptidases, Base Sequence, Biotinylation, Cell Extracts, Complement C1, Cross-Linking Reagents, DNA Damage, DNA Ligases, DNA Polymerase beta, DNA Repair, DNA, Single-Stranded, DNA-(Apurinic or Apyrimidinic Site) Lyase, Deoxyribonuclease IV (Phage T4-Induced), Formaldehyde, HeLa Cells, Humans, Kinetics, Magnetics, Microspheres, Models, Biological, Molecular Sequence Data, Nucleic Acid Conformation, Oligonucleotides, Polynucleotide 5'-Hydroxyl-Kinase, Recombinant Proteins, Saccharomyces cerevisiae Proteins, Streptavidin, Substrate Specificity, X-Rays