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Nucleic Acids Research Advance Access published online on August 5, 2008
Nucleic Acids Research, doi:10.1093/nar/gkn501
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© 2008 The Author(s)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Molecular Biology

Formation of an RNA polymerase II preinitiation complex on an RNA promoter derived from the hepatitis delta virus RNA genome

Abrahem Abrahem and Martin Pelchat*

Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, K1H 8M5, Canada

*To whom correspondence should be addressed. Tel: +613 562 5800 (ext. 8630); Fax: +613 562 5452; Email: mpelchat{at}uottawa.ca

Received March 28, 2008. Revised June 19, 2008. Accepted July 18, 2008.

Although RNA polymerases (RNAPs) are able to use RNA as template, it is unknown how they recognize RNA promoters. In this study, we used an RNA fragment derived from the hepatitis delta virus (HDV) genome as a model to investigate the recognition of RNA promoters by RNAP II. Inhibition of the transcription reaction using an antibody specific to the largest subunit of RNAP II and the direct binding of purified RNAP II to the RNA promoter confirmed the involvement of RNAP II in the reaction. RNA affinity chromatography established that an active RNAP II preinitiation complex forms on the RNA promoter and indicated that this complex contains the core RNAP II subunit and the general transcription factors TFIIA, TFIIB, TFIID, TFIIE, TFIIF, TFIIH and TFIIS. Binding assays demonstrated the direct binding of the TATA-binding protein and suggested that this protein is required to nucleate the RNAP II complex on the RNA promoter. Our findings provide a better understanding of the events leading to RNA promoter recognition by RNAP II.


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