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A point mutation at nucleotide 5258 in the B enhancer of the polyomavirus host range mutant F441 leads to productive infection of F9 embryonal carcinoma cells, which are refractory to infection by wild-type polyomavirus. Specific oligonucleotides were used to construct mutations in two other potentially important domains within the B enhancer of F441 DNA. One of these domains is the binding site for a factor present in nuclear extracts of F9 cells, and the other is a region that has sequence similarity to putative core sequences observed in a number of different viral enhancers. Mutation within either of these two domains, even in the presence of the F441 mutation, was detrimental to polyomavirus enhancer activity in F9 cells, as determined by both transfection and infection assays.

Multiple domains in the polyomavirus B enhancer are required for productive infection of F9 embryonal carcinoma cells