Abstract
The temperate bacteriophage Mu transduces the 4363 bp multi-copy plasmid pBR322 at frequencies similar to those of chromosomal markers. Plasmid transducing particles contain DNA molecules of Mu DNA length. Plasmid DNA is transduced as a head-to-tail oligomer that becomes circularized in the recipient cell. The rec system of the donor strain participates in oligomer formation and the rec system of the recipient strain is required for oligomer circularization. Possible mechanisms that may explain the origin of plasmid transducing particles are discussed.
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