Abstract
An enzymatic activity which converts closed circular DNA into a positively supercoiled form is present in cellular extracts of Sulfolobus, an acidothermophilic archaebacterium. This novel enzyme is a type II DNA topoisomerase and is active only at temperatures > 55 °C, in the presence ofATP and Mg2+.
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Kikuchi, A., Asai, K. Reverse gyrase—a topoisomerase which introduces positive superhelical turns into DNA. Nature 309, 677–681 (1984). https://doi.org/10.1038/309677a0
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DOI: https://doi.org/10.1038/309677a0
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