Inhibiting NAD+-dependent DNA ligase activity with 2-(cyclopentyloxy)-5'-deoxyadenosine (CPOdA) offers a new tool for DNA replication and repair studies in the model archaeon Haloferax volcanii

Xavier Giroux, Stuart MacNeill

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Abstract

DNA ligases play an essential role in many aspects of DNA metabolism in all three domains of life. The haloarchaeal organism Haloferax volcanii encodes both ATP- and NAD+-dependent DNA ligase enzymes designated LigA and LigN, respectively. Neither LigA nor LigN alone is required for cell viability but they share an essential function, most likely the ligation of Okazaki fragments during chromosome replication. Here we show that 2-(cyclopentyloxy)-5’-deoxyadenosine (referred to as CPOdA), originally developed as a inhibitor of bacterial NAD+-dependent DNA ligases, is a potent inhibitor of the growth of Hfx. volcanii cells expressing LigN alone, causing chromosome fragmentation and cell death, while cells expressing LigA are unaffected. Growth inhibition occurs at significantly lower CPOdA concentrations (MIC ≤ 50 ng/ml) than those required for inhibition of bacterial growth (≥ 2 µg/ml). CPOdA has the potential to become a vital tool in DNA replication and repair studies in this important model organism.

Original languageEnglish
Article numberfnv181
Number of pages5
JournalFEMS Microbiology Letters
Volume362
Issue number21
Early online date29 Sept 2015
DOIs
Publication statusPublished - 2015

Keywords

  • DNA ligase
  • Haloferax volcanii
  • Archaea
  • DNA replication
  • DNA repair

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