Abstract
Several plasmid DNAs have been isolated from mesophilic and thermophilic archaebacteria. Their superhelical densities were estimated at their host strain's optimal growth temperature, and in some representative strains, the presence of reverse gyrase activity (positive DNA supercoiling) was investigated. We show here that these plasmids can be grouped in two clusters with respect to their topological state. The group I plasmids have a highly negatively supercoiled DNA and belong to the mesophilic archaebacteria and all types of eubacteria. The group II plasmids have DNA which is close to the relaxed state and belong exclusively to the thermophilic archaebacteria. All archaebacteria containing a relaxed plasmid, with the exception of the moderately thermophilic methanogen Methanobacterium thermoautotrophicum Marburg, also exhibit reverse gyrase activity. These findings show that extrachromosomal DNAs with very different topological states coexist in the archaebacterial domain.
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