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pubmed-article:18250087pubmed:abstractTextDNA double-strand breaks (DSBs) induced in the genome of higher eukaryotes by ionizing radiation (IR) are predominantly removed by two pathways of non-homologous end-joining (NHEJ) termed D-NHEJ and B-NHEJ. While D-NHEJ depends on the activities of the DNA-dependent protein kinase (DNA-PK) and DNA ligase IV/XRCC4/XLF, B-NHEJ utilizes, at least partly, DNA ligase III/XRCC1 and PARP-1. Using in vitro end-joining assays and protein fractionation protocols similar to those previously applied for the characterization of DNA ligase III as an end-joining factor, we identify here histone H1 as an additional putative NHEJ factor. H1 strongly enhances DNA-end joining and shifts the product spectrum from circles to multimers. While H1 enhances the DNA-end-joining activities of both DNA Ligase IV and DNA Ligase III, the effect on ligase III is significantly stronger. Histone H1 also enhances the activity of PARP-1. Since histone H1 has been shown to counteract D-NHEJ, these observations and the known functions of the protein identify it as a putative alignment factor operating preferentially within B-NHEJ.lld:pubmed
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pubmed-article:18250087pubmed:authorpubmed-author:IliakisGeorge...lld:pubmed
pubmed-article:18250087pubmed:authorpubmed-author:WangMinliMlld:pubmed
pubmed-article:18250087pubmed:authorpubmed-author:SharmaAparnaAlld:pubmed
pubmed-article:18250087pubmed:authorpubmed-author:WangHuichenHlld:pubmed
pubmed-article:18250087pubmed:authorpubmed-author:RosidiBustanu...lld:pubmed
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