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Journal of Virology, October 2005, p. 12218-12230, Vol. 79, No. 19
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.19.12218-12230.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Irma Heid,1
R. Michael Linden,2
Mathias Ackermann,1 and
Cornel Fraefel1*
Institute of Virology, University of Zurich, 8057 Zurich, Switzerland,1 Department of Gene and Cell Medicine, Mount Sinai School of Medicine, New York, New York 100292
Received 21 April 2005/ Accepted 5 July 2005
The adeno-associated virus (AAV) inverted terminal repeats (ITRs) contain the AAV Rep protein-binding site (RBS) and the terminal resolution site (TRS), which together act as a minimal origin of DNA replication. The AAV p5 promoter also contains an RBS, which is involved in Rep-mediated regulation of promoter activity, as well as a functional TRS, and origin activity of these signals has in fact been demonstrated previously in the presence of adenovirus helper functions. Here, we show that in the presence of herpes simplex virus type 1 (HSV-1) and AAV Rep protein, p5 promoter-bearing plasmids are efficiently amplified to form large head-to-tail concatemers, which are readily packaged in HSV-1 virions if an HSV-1 DNA-packaging/cleavage signal is provided in cis. We also demonstrate simultaneous and independent replication from the two alternative AAV replication origins, p5 and ITR, on the single-cell level using multicolor-fluorescence live imaging, a finding which raises the possibility that both origins may contribute to the AAV life cycle. Furthermore, we assess the differential affinities of Rep for the two different replication origins, p5 and ITR, both in vitro and in live cells and identify this as a potential mechanism to control the replicative and promoter activities of p5.
Supplemental material for this article may be found at http://jvi.asm.org.
Present address: Molecular Biomedicine, Swiss Federal Institute of Technology, 8952 Zurich-Schlieren, Switzerland.
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