Specific inhibition of the eubacterial DNA ligase by arylamino compounds

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Abstract

All known DNA ligases catalyze the formation of a phosphodiester linkage between adjacent termini in double-stranded DNA via very similar mechanisms. The ligase family can, however, be divided into two classes: eubacterial ligases, which require NAD+ as a cofactor, and other ligases, from viruses, archaea, and eukaryotes, which use ATP. Drugs that discriminate between DNA ligases from different sources may have antieubacterial activity. We now report that a group of arylamino compounds, including some commonly used antimalarial and anti-inflammatory drugs and a novel series of bisquinoline compounds, are specific inhibitors of eubacterial DNA ligases. Members of this group of inhibitors have different heterocyclic ring systems with a common amino side chain in which the two nitrogens are separated by four carbon atoms. The potency, but not the specificity of action, is influenced by the DNA-binding characteristics of the inhibitor, and the inhibition is noncompetitive with respect to NAD+. The arylamino compounds appear to target eubacterial DNA ligase in vivo, since a Salmonella Lig- strain that has been rescued with the ATP-dependent T4 DNA ligase is less sensitive than the parental Salmonella strain.

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Ciarrocchi, G., Macphee, D. G., Deady, L. W., & Tilley, L. (1999). Specific inhibition of the eubacterial DNA ligase by arylamino compounds. Antimicrobial Agents and Chemotherapy, 43(11), 2766–2772. https://doi.org/10.1128/aac.43.11.2766

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