L189 is a DNA ligase I, III and IV inhibitor (IC50 values are 5, 9 and 5 μM respectively) that blocks DNA binding (Ki = 5 μM for DNA ligase I). Shown to preferentially inhibits step 2 of the ligation reaction, and inhibits base excision repair (BER) and non-homologous end joining (NHEJ).
Chen et al (2008) Rational design of human DNA ligase inhibitors that target cellular DNA replication and repair. Cancer Res. 68 3169.
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