title: Small fragments of herpesvirus DNA with transforming activity contain insertion sequence-like structures.
abstract: A 737-base-pair fragment of herpes simplex virus type 2 DNA with morphological-transforming ability was identified by transfecting into rodent cells deleted fragments of the left-hand end of the Bgl II N fragment region (map position 0.58-0.625), which were constructed in vitro. The transforming sequences lie within the coding region for a Mr 61,000 protein, but the fragment itself does not appear to specify a viral polypeptide. Contained within the transforming fragment are sequences that can be drawn as a stem-loop structure flanked by direct repeats, similar to an insertion sequence-like element. An insertion sequence-like structure was also found in a small fragment of human cytomegalovirus DNA that has transforming activity. Possible mechanisms of herpesvirus transformation are discussed.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D004251:DNA Transposable Elements; D004279:DNA, Viral / Q000235:genetics*; D005796:Genes; D009690:Nucleic Acid Conformation; D051381:Rats; D018139:Simplexvirus / Q000235:genetics*; D014162:Transfection
chemical_list: D004251:DNA Transposable Elements; D004279:DNA, Viral