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Restricted trandsuction by bacteriophage P22 in Salmonella typhimurium
Published online by Cambridge University Press: 14 April 2009
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1. In the transduction pro-401 (×) + some of the transductants are surrounded by several hundred small wild-type satellite colonies; these transductants spontaneously release phage which transduces pro-401 to wild-type at high frequency (HFT phage).
2. When the HFT phage is used to infect pro-401 at very low multiplicities of infection, most of the transductants are defective lysogens and segregate proline-requiring phage-sensitive derivatives; these transductants are apparently heterogenotes. At higher multiplicities of infection, or with lysogenic recipients, a higher proportion of satellited transductants is found.
3. The HFT phage preparations transduce only the proline region of the donor genome.
4. The existence is inferred of a defective P22 particle specifically incorporating the proline region of the Salmonella chromosome; these defective particles can establish themselves as prophage and confer immunity upon the infected cell, but are unable to replicate unless a normal prophage is also present. Satellited transductants are lysogenic both for a normal and defective (proline region carrying) phage, and so on lysis release transducing phage.
5. This system is compared with the λdg-gal and P1-dl-lac systems in E. coli.
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