Purification of Caenorhabditis elegans DNA topoisomerase I

Sang Mee Park, Hyeon Sook Koo

Research output: Contribution to journalArticle

6 Citations (Scopus)


DNA topoisomerase I was partially purified from Caenorhabditis elegans worms. The enzyme is a 95 kDa polypeptide and its proteolytically degraded form of 70 kDa was also observed. The enzyme removed not only negative but also positive DNA supercoils. The optimum salt concentration for the DNA relaxation activity was 100 mM KCl, and divalent cations were not required but stimulated the activity. The DNA relaxation activity was weakly sensitive to 125 μM camptothecin but was completely inhibited by 125 μM berenil.

Original languageEnglish
Pages (from-to)47-54
Number of pages8
JournalBBA - Gene Structure and Expression
Issue number1
Publication statusPublished - 1994 Sep 13

All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Biophysics
  • Biochemistry
  • Genetics

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