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Research Article

DNA sequence requirements for replication of polyomavirus DNA in vivo and in vitro.

C Prives, Y Murakami, F G Kern, W Folk, C Basilico, J Hurwitz
C Prives
Department of Biological Sciences, Columbia University, New York, New York 10027.
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Y Murakami
Department of Biological Sciences, Columbia University, New York, New York 10027.
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F G Kern
Department of Biological Sciences, Columbia University, New York, New York 10027.
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W Folk
Department of Biological Sciences, Columbia University, New York, New York 10027.
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C Basilico
Department of Biological Sciences, Columbia University, New York, New York 10027.
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J Hurwitz
Department of Biological Sciences, Columbia University, New York, New York 10027.
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DOI: 10.1128/MCB.7.10.3694
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ABSTRACT

Cell extracts of FM3A mouse cells replicate polyomavirus (Py) DNA in the presence of immunoaffinity-purified Py large T antigen, deoxynucleoside triphosphates, ATP, and an ATP-generating system. This system was used to examine the effects of mutations within or adjacent to the Py core origin (ori) region in vitro. The analysis of plasmid DNAs containing deletions within the early-gene side of the Py core ori indicated that sequences between nucleotides 41 and 57 define the early boundary of Py DNA replication in vitro. This is consistent with previously published studies on the early-region sequence requirements for Py replication in vivo. Deleting portions of the T-antigen high-affinity binding sites A and B (between nucleotides 57 and 146) on the early-gene side of the core ori led to increased levels of replication in vitro and to normal levels of replication in vivo. Point mutations within the core ori region that abolish Py DNA replication in vivo also reduced replication in vitro. A mutant with a reversed orientation of the Py core ori region replicated in vitro, but to a lesser extent that wild-type Py DNA. Plasmids with deletions on the late-gene side of the core ori, within the enhancer region, that either greatly reduced or virtually abolished Py DNA replication in vivo replicated to levels similar to those of wild-type Py DNA plasmids in vitro. Thus, as has been observed with simian virus 40, DNA sequences needed for Py replication in vivo are different from and more stringent than those required in vitro.

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DNA sequence requirements for replication of polyomavirus DNA in vivo and in vitro.
C Prives, Y Murakami, F G Kern, W Folk, C Basilico, J Hurwitz
Molecular and Cellular Biology Oct 1987, 7 (10) 3694-3704; DOI: 10.1128/MCB.7.10.3694

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DNA sequence requirements for replication of polyomavirus DNA in vivo and in vitro.
C Prives, Y Murakami, F G Kern, W Folk, C Basilico, J Hurwitz
Molecular and Cellular Biology Oct 1987, 7 (10) 3694-3704; DOI: 10.1128/MCB.7.10.3694
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