A prokaryotic non-homologous end-joining (NHEJ) system for the repair of DNA double-strand breaks (DSBs), composed of a Ku homodimer (Mt-Ku) and a multidomain multifunctional ATP-dependent DNA ligase (Mt-Lig), has been described recently in Mycobacterium tuberculosis. Mt-Lig exhibits polymerase and nuclease activity in addition to DNA ligation activity. These functions were ascribed to putative polymerase,...
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