title: Enhanced infectivity of adenovirus type 2 DNA and a DNA-protein complex.
abstract: The infectivity of adenovirus type 2 DNA and a DNA-protein complex was studied in 293 cells, a human embryonic kidney cell line transformed by sheared adenovirus type 5 DNA, and in human KB cells. Adenovirus type 2 DNA was more infectious (up to about 40-fold) in 293 cells than in KB cells, whereas a DNA-protein complex (prepared by a rapid procedure) had about the same infectivity in both cell lines. These data may mean that a factor present in 293 cells (perhaps a viral-coded protein) enhances the infectivity of free viral DNA. The infectivity of DNA and the DNA-protein complex was increased up to fivefold by brief treatment of cell monolayers with 25% dimethyl sulfoxide after transfection. Under these conditions, (i) the infectivity of native adenovirus type 2 DNA ranged from 400 to 1,300 PFU/microgram of DNA in 293 cells and from about 9 to 14 PFU/microgram of DNA in KB cells, and (ii) the infectivity of the DNA-protein complex was 6 X 10(3)to 2 X 10(4) PFU/microgram in 293 cells and 1.4 X 10(4) to 1.6 X 10(4) PFU/microgram in KB cells.
mesh_terms: D000260:Adenoviruses, Human / Q000235:genetics*; D002460:Cell Line; D004265:DNA Helicases / Q000235:genetics*; D004279:DNA, Viral / Q000235:genetics*; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D014162:Transfection / Q000187:drug effects; D014764:Viral Proteins / Q000235:genetics*
chemical_list: D004279:DNA, Viral; D014764:Viral Proteins; D004265:DNA Helicases; D004121:Dimethyl Sulfoxide