Skip to Main content Skip to Navigation
Journal articles

A novel archaeal regulatory protein, Sta1, activates transcription from viral promoters.

Abstract : While studying gene expression of the rudivirus SIRV1 in cells of its host, the hyperthermophilic crenarchaeon Sulfolobus, a novel archaeal transcriptional regulator was isolated. The 14 kDa protein, termed Sulfolobus transcription activator 1, Sta1, is encoded on the host chromosome. Its activating effect on transcription initiation from viral promoters was demonstrated in in vitro transcription experiments using a reconstituted host system containing the RNA polymerase, TATA-binding protein (TBP) and transcription factor B (TFB). Most pronounced activation was observed at low concentrations of either of the two transcription factors, TBP or TFB. Sta1 was able to bind viral promoters independently of any component of the host pre-initiation complex. Two binding sites were revealed by footprinting, one located in the core promoter region and the second approximately 30 bp upstream of it. Comparative modeling, NMR and circular dichroism of Sta1 indicated that the protein contained a winged helix-turn-helix motif, most probably involved in DNA binding. This strategy of the archaeal virus to co-opt a host cell regulator to promote transcription of its genes resembles eukaryal virus-host relationships.
Document type :
Journal articles
Complete list of metadatas

Cited literature [47 references]  Display  Hide  Download

https://hal-pasteur.archives-ouvertes.fr/pasteur-00364745
Contributor : Cécile Roux <>
Submitted on : Friday, February 27, 2009 - 10:07:26 AM
Last modification on : Monday, January 13, 2020 - 5:08:07 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 10:58:18 PM

File

18_Sta1_NAR_06-1.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Alexandra Kessler, Guennadi Sezonov, J. Inaki Guijarro, Nicole Desnoues, Thierry Rose, et al.. A novel archaeal regulatory protein, Sta1, activates transcription from viral promoters.. Nucleic Acids Research, Oxford University Press, 2006, 34 (17), pp.4837-45. ⟨10.1093/nar/gkl502⟩. ⟨pasteur-00364745⟩

Share

Metrics

Record views

348

Files downloads

480