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• W2135735491 endingPage "3003" @default.
• W2135735491 startingPage "2996" @default.
• W2135735491 abstract "Genetic experiments have determined that Ku, XRCC4, and ligase IV are required for repair of double-strand breaks by the end-joining pathway. The last two factors form a tight complex in cells. However, ligase IV is only one of three known mammalian ligases and is intrinsically the least active in intermolecular ligation; thus, the biochemical basis for requiring this ligase has been unclear. We demonstrate here a direct physical interaction between the XRCC4-ligase IV complex and Ku. This interaction is stimulated once Ku binds to DNA ends. Since XRCC4-ligase IV alone has very low DNA binding activity, Ku is required for effective recruitment of this ligase to DNA ends. We further show that this recruitment is critical for efficient end-joining activity in vitro. Preformation of a complex containing Ku and XRCC4-ligase IV increases the initial ligation rate 20-fold, indicating that recruitment of the ligase is an important limiting step in intermolecular ligation. Recruitment by Ku also allows XRCC4-ligase IV to use Ku's high affinity for DNA ends to rapidly locate and ligate ends in an excess of unbroken DNA, a necessity for end joining in cells. These properties are conferred only on ligase IV, because Ku does not similarly interact with the other mammalian ligases. We have therefore defined cell-free conditions that reflect the genetic requirement for ligase IV in cellular end joining and consequently can explain in molecular terms why this factor is required." @default.
• W2135735491 created "2016-06-24" @default.
• W2135735491 creator A5028912042 @default.
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• W2135735491 creator A5048086689 @default.
• W2135735491 creator A5076234244 @default.
• W2135735491 date "2000-05-01" @default.
• W2135735491 modified "2023-09-26" @default.
• W2135735491 title "Ku Recruits the XRCC4-Ligase IV Complex to DNA Ends" @default.
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• W2135735491 doi "https://doi.org/10.1128/mcb.20.9.2996-3003.2000" @default.
• W2135735491 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/85565" @default.
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