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Molecular and Cellular Biology, June 2002, p. 3639-3652, Vol. 22, No. 11
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.11.3639-3652.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The Adeno-Associated Virus Type 2 Rep Protein Regulates RNA Processing via Interaction with the Transcription Template

Jianming Qiu and David J. Pintel*

Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri 65212

Received 20 December 2001/ Returned for modification 20 February 2002/ Accepted 4 March 2002

The adeno-associated virus type 2 (AAV) large Rep proteins can act to increase the ratio of spliced to unspliced AAV RNA when they are targeted to the transcription template via a Rep binding element. The required Rep binding site is both location and orientation independent; however, Rep enhancement decreases as the distance between the promoter and the intron of the affected transcription unit increases. Only the AAV intron and an extended polyadenylation site must remain for the AAV transcription unit to manifest responsiveness to Rep. A number of promoters, when driving the AAV capsid gene transcription unit, were responsive to targeted Rep, though to various degrees. Transactivation of transcription initiation is not sufficient for the enhancement of RNA processing, because activation of the P40 transcription unit by other activators targeted to this transcription template did not result in enhancement of the ratio of spliced to unspliced AAV RNA. These results suggest that Rep may act as a trans regulator of RNA processing by modulating such functions coupled to RNA polymerase II (RNA pol II) transcription, perhaps by affecting the composition of the transcription complex either prior to or during elongation. These results reveal another way in which gene expression can be regulated by trans-acting proteins and help explain an important feature of the parvovirus life cycle.

* Corresponding author. Mailing address: Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, MO 65212. Phone: (573) 882-3920. Fax: (573) 882-4287. E-mail: pinteld{at}missouri.edu.

Molecular and Cellular Biology, June 2002, p. 3639-3652, Vol. 22, No. 11
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.11.3639-3652.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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