, Volume 12, Issue 6, pp 799–809

Transcriptional analysis of the two reverse gyrase encoding genes of Sulfolobus solfataricus P2 in relation to the growth phases and temperature conditions

Original Paper

DOI: 10.1007/s00792-008-0186-2

Cite this article as:
Garnier, F. & Nadal, M. Extremophiles (2008) 12: 799. doi:10.1007/s00792-008-0186-2


Sulfolobus solfataricus, a hyperthermophilic crenarchaeon, contains two genes encoding reverse gyrases, topR1 and topR2. The steady-state level of their transcripts were quantified during the growth phases for cells maintained either at 72, or 80°C, and after temperature changes from one to the other temperature. The transcripts of both genes are weakly expressed, but the highest level is observed in actively dividing cells, and is almost undetectable in cells in decline phase. During the temperature shift experiments, there is no significant topR2 variation. By contrast, there is a maximum 2.4-fold increase in topR1 transcripts within 30 min after the downshift. After 1 h, the transcript level reaches the level characteristic of cells adapted to the new temperature. After an upward shift, the topR1 expression pattern is inversely regulated with a transient decrease with the same time course. The topR1 expression profile is completely different from that of topR2 after temperature shift experiments; this suggests a different regulation process for the two reverse gyrase genes. The fine tuning of the topR1 transcript expression within a short interval of time after a temperature shift illustrates a rapid adaptation response to temperature change.


Reverse gyrase Topoisomerase Archaea Expression Growth phase Temperature 

Copyright information

© Springer 2008

Authors and Affiliations

  1. 1.Laboratoire de Génétique et Biologie CellulaireUniversité de Versailles-Saint-Quentin-en-Yvelines, CNRS UMR 8159Versailles cedexFrance
  2. 2.Laboratoire de Biologie Moléculaire du Gène chez les ExtrémophilesUniversité Paris Sud, Institut de Génétique et Microbiologie, CNRS UMR 8621Orsay cedexFrance

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