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Hybrid viral genomes were used to investigate the influence of specific polyomavirus sequences on the transforming behavior of JC virus (JCV). One set of chimeric DNAs was made by exchanging the regulatory regions between JCV and simian virus 40 (SV40) or JCV and BK virus (BKV). A second set of constructs was produced that expressed hybrid JCV-BKV T proteins under the control of either JCV or BKV regulatory signals. Transformation of Rat 2 cells with the parental and chimeric DNAs indicated that both the JCV regulatory signals and the sequence encoding the amino terminus of T protein contributed to the restricted transforming behavior of this virus. Analysis of the viral proteins in the transformed rat cells indicated that the large T antigens of JCV and BKV were less stable than their SV40 counterpart, that small t protein was produced in JCV transformants, and that the subpopulation of T antigen that forms a stable complex with cellular p53 protein was smaller in JCV-transformed cells than in SV40- or BKV-transformed cells.

Hybrid genomes of the polyomaviruses JC virus, BK virus, and simian virus 40: identification of sequences important for efficient transformation