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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Fate of cloned bacteriophage T4 DNA after phage T4 infection of clone-bearing cells.

Plasmid pBR322 replication is inhibited after bacteriophage T4 infection. If no T4 DNA had been cloned into this plasmid vector, the kinetics of inhibition are similar to those observed for the inhibition of Escherichia coli chromosomal DNA. However, if T4 DNA has been cloned into pBR322, plasmid DNA synthesis is initially inhibited but then resumes approximately at the time that phage DNA replication begins. The T4 insert-dependent synthesis of pBR322 DNA is not observed if the infecting phage are deleted for the T4 DNA cloned in the plasmid. Thus, this T4 homology-dependent synthesis of plasmid DNA probably reflects recombination between plasmids and infecting phage genomes. However, this recombination-dependent synthesis of pBR322 DNA does not require the T4 gene 46 product, which is essential for T4 generalized recombination. The effect of T4 infection on the degradation of plasmid DNA is also examined. Plasmid DNA degradation, like E. coli chromosomal DNA degradation, occurs in wild-type and denB mutant infections. However, neither plasmid or chromosomal degradation can be detected in denA mutant infections by the method of DNA--DNA hybridization on nitrocellulose filters.[1]


  1. Fate of cloned bacteriophage T4 DNA after phage T4 infection of clone-bearing cells. Mattson, T., Van Houwe, G., Bolle, A., Epstein, R. J. Mol. Biol. (1983) [Pubmed]
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