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. 1997 Mar;179(5):1721–1726. doi: 10.1128/jb.179.5.1721-1726.1997

Characterization of the reverse gyrase from the hyperthermophilic archaeon Pyrococcus furiosus.

K M Borges 1, A Bergerat 1, A M Bogert 1, J DiRuggiero 1, P Forterre 1, F T Robb 1
PMCID: PMC178887  PMID: 9045834

Abstract

The reverse gyrase gene rgy from the hyperthermophilic archaeon Pyrococcus furiosus was cloned and sequenced. The gene is 3,642 bp (1,214 amino acids) in length. The deduced amino acid sequence has relatively high similarity to the sequences of the Methanococcus jannaschii reverse gyrase (48% overall identity), the Sulfolobus acidocaldarius reverse gyrase (41% identity), and the Methanopynrus kandleri reverse gyrase (37% identity). The P. furiosus reverse gyrase is a monomeric protein, containing a helicase-like module and a type I topoisomerase module, which resembles the enzyme from S. acidocaldarius more than that from M. kandleri, a heterodimeric protein encoded by two separate genes. The control region of the P. furiosus rgy gene contains a typical archaeal putative box A promoter element which is located at position -26 from the transcription start identified by primer extension experiments. The initiating ATG codon is preceded by a possible prokaryote-type ribosome-binding site. Purified P. furiosus reverse gyrase has a sedimentation coefficient of 6S, suggesting a monomeric structure for the native protein. The enzyme is a single polypeptide with an apparent molecular mass of 120 kDa, in agreement with the gene structure. The sequence of the N terminus of the protein corresponded to the deduced amino acid sequence. Phylogenetic analysis indicates that all known reverse gyrase topoisomerase modules form a subgroup inside subfamily IA of type I DNA topoisomerases (sensu Wang [J. C. Wang, Annu. Rev. Biochem. 65:635-692, 1996]). Our results suggest that the fusion between the topoisomerase and helicase modules of reverse gyrase occurred before the divergence of the two archaeal phyla, Crenoarchaeota and Euryarchaeota.

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