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Journal of Bacteriology, June 2004, p. 3492-3498, Vol. 186, No. 11
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.11.3492-3498.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Transcription by an Archaeal RNA Polymerase Is Slowed but Not Blocked by an Archaeal Nucleosome

Yunwei Xie and John N. Reeve*

Department of Microbiology, Ohio State University, Columbus, Ohio 43210-1292

Received 31 October 2003/ Accepted 15 December 2003

Archaeal RNA polymerases (RNAPs) are closely related to eukaryotic RNAPs, and in Euryarchaea, genomic DNA is wrapped and compacted by histones into archaeal nucleosomes. In eukaryotes, transcription of DNA bound into nucleosomes is facilitated by histone tail modifications and chromatin remodeling complexes, but archaeal histones do not have histone tails and archaeal genome sequences provide no evidence for archaeal homologs of eukaryotic chromatin remodeling complexes. We have therefore investigated the ability of an archaeal RNAP, purified from Methanothermobacter thermautotrophicus, to transcribe DNA bound into an archaeal nucleosome by HMtA2, an archaeal histone from M. thermautotrophicus. To do so, we constructed a template that allows transcript elongation to be separated from transcription initiation, on which archaeal nucleosome assembly is positioned downstream from the site of transcription initiation. At 58°C, in the absence of an archaeal nucleosome, M. thermautotrophicus RNAP transcribed this template DNA at a rate of ~20 nucleotides per second. With an archaeal nucleosome present, transcript elongation was slowed but not blocked, with transcription pausing at sites before and within the archaeal nucleosome. With additional HMtA2 binding, complexes were obtained that also incorporated the upstream regulatory region. This inhibited transcription presumably by preventing archaeal TATA-box binding protein, general transcription factor TFB, and RNAP access and thus inhibiting transcription initiation.

* Corresponding author. Mailing address: Department of Microbiology, Ohio State University, Columbus, OH 43210-1292. Phone: (614) 292-2301. Fax: (614) 292-8120. E-mail: reeve.2{at}osu.edu.

Journal of Bacteriology, June 2004, p. 3492-3498, Vol. 186, No. 11
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.11.3492-3498.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Friedrich-Jahn, U., Aigner, J., Langst, G., Reeve, J. N., Huber, H. (2009). Nanoarchaeal Origin of Histone H3?. J. Bacteriol. 191: 1092-1096 [Abstract] [Full Text]  
  • Shin, J.-H., Santangelo, T. J., Xie, Y., Reeve, J. N., Kelman, Z. (2007). Archaeal Minichromosome Maintenance (MCM) Helicase Can Unwind DNA Bound by Archaeal Histones and Transcription Factors. J. Biol. Chem. 282: 4908-4915 [Abstract] [Full Text]  
  • Barry, E. R., Bell, S. D. (2006). DNA Replication in the Archaea. Microbiol. Mol. Biol. Rev. 70: 876-887 [Abstract] [Full Text]  
  • Xie, Y., Reeve, J. N. (2005). Regulation of Tryptophan Operon Expression in the Archaeon Methanothermobacter thermautotrophicus. J. Bacteriol. 187: 6419-6429 [Abstract] [Full Text]  
  • Xie, Y., Reeve, J. N. (2004). Transcription by Methanothermobacter thermautotrophicus RNA Polymerase In Vitro Releases Archaeal Transcription Factor B but Not TATA-Box Binding Protein from the Template DNA. J. Bacteriol. 186: 6306-6310 [Abstract] [Full Text]  


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