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. 1986 Jun;83(11):3609–3613. doi: 10.1073/pnas.83.11.3609

Transient replication of bovine papilloma virus type 1 plasmids: cis and trans requirements.

M Lusky, M R Botchan
PMCID: PMC323572  PMID: 3012521

Abstract

A transient assay has been used to study bovine papilloma virus type 1 (BPV-1) replication. We show that BPV-1 early replication occurs faster than cellular DNA synthesis. Initial replication events are dependent on a gene product(s), encoded by the BPV-1 E1 open reading frame. Mutational analysis of the viral upstream regulatory region shows the requirement of two domains in cis for replication. Domain one, located outside of the viral 69% transforming fragment, is an enhancer-like activity and can be replaced by other known viral enhancers. Domain two lies within sequences previously defined as plasmid maintenance sequence 1. The apparent requirement for a proximal enhancer function for replication may explain why certain BPV-1 constructions, when linked to bacterial plasmid sequences, can be maintained extrachromosomally while others cannot.

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