Abstract
The DNA-binding properties of purified full-length E2 protein from bovine papillomavirus type 1 have been investigated by utilizing a quantitative gel shift analysis. By using a recombinant baculovirus which expresses the E2 open reading frame from the polyhedrin promoter, the full-length E2 protein was synthesized in insect cells and purified to homogeneity by using an E2 binding site (ACCGN4CGGT)-specific oligonucleotide column. The K(d) of E2 binding to a 41-bp oligonucleotide containing a single binding site was found to be 2 x 10-11 M. When two binding sites were included on an oligonucleotide, cooperative binding to these sites by the E2 protein was observed. A cooperativity parameter of 8.5 was determined for E2 binding to two sites. An 86-amino-acid peptide encompassing the C terminus of the protein retains the ability to bind E2 binding sites with a K(d) of 4 x 10-10 M but exhibits slight cooperativity of binding to two adjacent sites. A major determinant for cooperative binding of the full-length E2 protein is thus encoded by the N-terminal amino acids outside the minimal DNA binding domains.
Original language | English (US) |
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Pages (from-to) | 2124-2130 |
Number of pages | 7 |
Journal | Journal of virology |
Volume | 65 |
Issue number | 4 |
DOIs | |
State | Published - 1991 |
ASJC Scopus subject areas
- Microbiology
- Immunology
- Insect Science
- Virology