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Research Papers
University of California, Department of Molecular Biology, Berkeley 94720.
Abstract
The DNA context of nucleotides that a protein recognizes can influence the strength of the protein-DNA interaction. Moreover, in prokaryotes, understanding the quantitative differences in binding affinities that result in part from the DNA context is often important in describing regulatory mechanisms. Nevertheless, these issues have not been a major focus yet for the investigation of protein-DNA interactions in eukaryotes. In this study, we explored the binding specificity and the range of affinities that the BPV-1 E2 transcriptional activator has for DNA. Because E2 binding sites are positioned near several different BPV-1 promoters, such quantitative information may be important to understand transcriptional regulatory mechanisms in BPV-1. Gel retardation assays and DNA footprinting were used to quantitate the affinities of the E2 binding sites in the viral genome. In the process, five sites were discovered, which, on the basis of sequence, had not been predicted previously to interact with the E2 protein. Equilibrium and kinetic studies show that the range of E2 affinities of the 17 sites varied over 300-fold. The sequence elements responsible for E2 recognition of DNA were determined by missing contact analysis of several sites and a point mutation analysis of one site. The results presented show that the affinity of an E2 binding site is to a large extent determined by the availability of specific contacts, but the data also strongly suggest that DNA structure plays an important role.
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