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Fine structure genetic and physical map of the gene 3 to 10 region of the bacteriophage P22 chromosome.
Genetics
April 1991
Department of Cellular, Viral and Molecular Biology, University of Utah Medical Center, Salt Lake City 84132.
The mechanism by which dsDNA is packaged by viruses is not yet understood in any system. Bacteriophage P22 has been a productive system in which to study the molecular genetics of virus particle assembly and DNA packaging. Only five phage encoded proteins, the products of genes 3, 2, 1, 8 and 5, are required for packaging the virus chromosome inside the coat protein shell.
View Article and Find Full Text PDFIntegrated structures of duck hepatitis B virus DNA in hepatocellular carcinoma.
J Virol
March 1988
Department of Gene Research, Cancer Institute, Tokyo, Japan.
The structure of integrated viral DNA in a hepatocellular carcinoma of a duck from Chi-tung county in China was analyzed. Three different clones of integrated viral DNA, lambda DHS 6-1, lambda DHS 6-2, and lambda DHE 6-2, were obtained from the neoplastic portion of the liver by molecular cloning. One of the three clones, lambda DHS 6-1, showed inverted repetition of integrated viral DNA with chromosomal flanking sequences.
View Article and Find Full Text PDFA method is described, based on an approach previously employed for the mapping of adenovirus ts mutants (Grodzicker et al. 1975), for the identification of recombinant viruses in the progeny of mixed infections of human HeLa cells with wild-type adenovirus types 2 and 5 under non-selective conditions. Differences in restriction enzyme sites for the endonuclease HpaI could be used to detect new recombinant DNA fragments in a yield of 3 to 6% after single mixed infections and yields up to 25% following three successive mixed infections.
View Article and Find Full Text PDFReplicating chromosomes, called intermediate DNA, have been extracted from the adenovirus replication complex. Compared to mature molecules, intermediate DNA had a greater buoyant density in CsCl gradients and ethidium bromide-cesium chloride gradients. Digestion of intermediate DNA with S1 endonuclease, but not with RNase, abolished the difference in densities.
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