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PAXX Is an Accessory c-NHEJ Factor that Associates with Ku70 and Has Overlapping Functions with XLF.

Abstract：

:In mammalian cells, classical non-homologous end joining (c-NHEJ) is critical for DNA double-strand break repair induced by ionizing radiation and during V(D)J recombination in developing B and T lymphocytes. Recently, PAXX was identified as a c-NHEJ core component. We report here that PAXX-deficient cells exhibit a cellular phenotype uncharacteristic of a deficiency in c-NHEJ core components. PAXX-deficient cells display normal sensitivity to radiomimetic drugs, are proficient in transient V(D)J recombination assays, and do not shift toward higher micro-homology usage in plasmid repair assays. Although PAXX-deficient cells lack c-NHEJ phenotypes, PAXX forms a stable ternary complex with Ku bound to DNA. Formation of this complex involves an interaction with Ku70 and requires a bare DNA extension for stability. Moreover, the relatively weak Ku-dependent stimulation of LIG4/XRCC4 activity by PAXX is unmasked by XLF ablation. Thus, PAXX plays an accessory role during c-NHEJ that is largely overlapped by XLF's function.

journal_name

Cell Rep

journal_title

Cell reports

authors

Tadi SK,Tellier-Lebègue C,Nemoz C,Drevet P,Audebert S,Roy S,Meek K,Charbonnier JB,Modesti M

doi

10.1016/j.celrep.2016.09.026

subject

Has Abstract

pub_date

2016-10-04 00:00:00

pages

541-555

issue

2

issn

2211-1247

pii

S2211-1247(16)31248-7

journal_volume

17

pub_type

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