Nucleic Acids Research, 1992, Vol. 20, No. 22 6015-6021
© 1992
MOLECULAR BIOLOGY |
The E2 binding sites determine the efficiency of replication for the origin of human papillomavirus type 18
Estonian Biocenter Jakobi Street 2, Tartu EE2400, Estonia 1The Cell Proliferation Laboratory, Marie Curie Cancer Research Institute The Chart, Oxted, Surrey RH8 OTL, UK
Received August 4, 1992. Revised October 20, 1992. Accepted October 20, 1992.
Human papillomaviruses (HPV-s) have been shown to possess transforming and immortalizing activity for many different, mainly keratinocyte cell lines and they have been detected in 90% of anogenital cancer tissues, which suggests a causative role in the induction of anogenital and other tumours. We have exploited a quantitative assay to identify and characterize the origin of replication of the human papillomavirus type 18 (HPV-18), one of the most prevalent types in the high-risk HPV group. Replication of HPV origin fragments was studied transiently by cotransfection with a protein expression vector providing replication proteins E1 and E2. We have localized the HPV-18 origin to nucleotides 7767-119. This region contains three E2 binding sites and an essential A/T rich DNA region (nucleotides 9 - 35) that is partly homologous to the E1 binding site found in bovine papillomavirus type 1 (BPV-1) genome. At least one of the three E2 binding sites was absolutely required for origin function; addition of other E2 sites had cooperative stimulating effect. This is the first quantitative analysis of the E2 binding sites for papillomavirus replication.
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