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1 Papillomavirus Research Unit, Lions Human Immunology Laboratories, Princess Alexandra Hospital, Ipswich Road, Brisbane, Queensland 4102
and2 Analytical Electron Microscopy Facility, Queensland University of Technology, George Street, Brisbane, Queensland 4001, Australia
Bovine papillomavirus type 1 (BPV-1) virions were produced in vitro using vaccinia virus (VV) recombinants expressing the BPV-1 L1 and L2 capsid proteins. Particles morphologically resembling papillomaviruses were observed in the nucleus of cells infected with a VV recombinant for the BPV-1 L1 protein, and greater numbers of similar particles were seen in the nuclei of cells infected with a VV double recombinant for L1 and L2. Virus-like particles (VLPs) assembled in cells infected with the VV double recombinant for BPV-1 L1 and L2, and not those assembled in cells infected with the VV recombinant for BPV-1 L1 alone, were able to package BPV-1 DNA. Transcription of the BPV-1 E1 viral open reading frame was observed after a mouse fibroblast cell line was exposed to VLPs produced using a BPV-1 L1/L2 VV recombinant in a cell line containing episomal BPV-1 DNA. E1 transcription was not observed when the VLPs were pre-incubated with antibodies to the capsid protein of BPV-1. This system should allow an in vitro approach to the definition of the BPV-1 cellular receptor.
Received 21 September 1992;
accepted 1 December 1992.
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