Abstract
The temperate bacteriophage P22 mediates both generalized and specialized transduction in Salmonella typhimurium. Specialized transduction by phage P22 is different from, and less restricted than, the well characterized specialized transduction by phage lambda, due to differences in the phage DNA packaging mechanism. Phage lysates produced by induction of lysogenic strains contain very high frequencies of supQ newD- and proA,B-specialized transducing particles (10(-2)/PFU and 10(-3)/PFU, respectively), most of which are produced by independent aberrant excision events of various types. In a model, 12 different modes of transduction mechanisms were characterized by: (i) the structure of the specialized transducing genomes after injection into a new host cell, i.e., linear or circular, and (ii) the requirements for the transduction process, i.e., host recombination functions, phage integration functions, or presence of a prophage. By using different recipient strains and phage helper strains, it was possible to show that most specialized transducing particles (ca. 99%) contain linear genomes that cannot circularize upon injection into a new host cell and that require the presence of an integrated prophage as a site for a recombinational event to give rise to a transductant. Only 0.1% of all specialized transducing particles were shown to transduce by integration, suggesting that transducing genomes containing terminally redundant ends represent only a minor fraction of all transducing particles that are produced. However, it should be pointed out that the frequency (approximately 10(-5)/PFU) of these specialized transducing genomes that can circularize upon injection into a new host cell is as high as or even higher than the frequency of specialized transducing particles of phage lambda. The remaining approximately 1% of all specialized transducing particles can transduce by any one of the other mechanisms described.
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