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. 1999 Apr 1;18(7):2008–2018. doi: 10.1093/emboj/18.7.2008

DNA binding of Xrcc4 protein is associated with V(D)J recombination but not with stimulation of DNA ligase IV activity.

M Modesti 1, J E Hesse 1, M Gellert 1
PMCID: PMC1171285  PMID: 10202163

Abstract

Mammalian cells are protected from the effects of DNA double-strand breaks by end-joining repair. Cells lacking the Xrcc4 protein are hypersensitive to agents that induce DNA double-strand breaks, and are unable to complete V(D)J recombination. The residual repair of broken DNA ends in XRCC4-deficient cells requires short sequence homologies, thus possibly implicating Xrcc4 in end alignment. We show that Xrcc4 binds DNA, and prefers DNA with nicks or broken ends. Xrcc4 also binds to DNA ligase IV and enhances its joining activity. This stimulatory effect is shown to occur at the adenylation of the enzyme. DNA binding of Xrcc4 is correlated with its complementation of the V(D)J recombination defects in XRCC4-deficient cells, but is not required for stimulation of DNA ligase IV. Thus, the ability of Xrcc4 to bind to DNA suggests functions independent of DNA ligase IV.

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Selected References

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