Non-homologous end-joining factor 1

UniProtKB accession:  A0A1L8ENT6

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UniProtKB description:  DNA repair protein involved in DNA non-homologous end joining (NHEJ); required for double-strand break (DSB) repair and V(D)J recombination (PubMed:30177755, PubMed:33289484). Plays a key role in NHEJ by promoting the ligation of various mismatched and non-cohesive ends (By similarity). In some studies, has been shown to associate with xrcc4 to form alternating helical filaments that bridge DNA and act like a bandage, holding together the broken DNA until it is repaired (By similarity). Alternatively, it has also been shown that rather than forming filaments, a single nhej1 dimer interacts through both head domains with xrcc4 to promote the close alignment of DNA ends (PubMed:30177755). The xrcc4-nhej1/xlf subcomplex binds to the DNA fragments of a DSB in a highly diffusive manner and robustly bridges two independent DNA molecules, holding the broken DNA fragments in close proximity to one other (By similarity). The mobility of the bridges ensures that the ends remain accessible for further processing by other repair factors (By similarity).