The lysogenic region of virus φCh1: Identification of a repressor-operator system and determination of its activity in halophilic Archaea

M. Mayrhofer-Iro, R. Klein, B. Gálos, U. Baranyi, N. Rössler, A. Witte

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

Abstract

φCh1 is a temperate virus infecting the haloalkaliphilic archaeon Natrialba magadii. As for all temperate viruses, a control of the lysogenic state versus the lytic life cycle is essential. Two open reading frames (ORFs) have been identified as putative repressor encoding genes: ORF48 and ORF49. The protein of ORF48 showed sequence similarities to putative repressor molecules. ORF49 was identified by the analysis of a mutant of φCh1: the lysogenic strain carrying mutant φCh1-1 showed a different lysis behavior than wild type virus φCh1, indicating a dysfunction in the regulation of gene expression. Here, we show that the intergenic region between ORF48 and ORF49 comprises a promoter/operator sequence that is a transcriptionally active region in the model system Haloferax volcanii. Transcription from this region can be repressed by the activity of the ORF48 gene product. Gp43/gp44 has an enhancing effect on this regulatory sequence. Evidence is given for a possible binding site of Rep and gp43/gp44 within the coding region of the rep gene. © 2006 Springer.
OriginalspracheEnglisch
Seiten (von - bis)383-396
Seitenumfang14
FachzeitschriftExtremophiles
Jahrgang11
Ausgabenummer2
DOIs
PublikationsstatusVeröffentlicht - 23 Nov. 2006
Extern publiziertJa

Forschungsfelder

  • Virologie und RNA Biologie

IMC Forschungsschwerpunkte

  • Medical biotechnology

ÖFOS 2012 - Österreichischen Systematik der Wissenschaftszweige

  • 304005 Medizinische Biotechnologie

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