Abstract
The Bacillus subtilis temperate bacteriophages phi 105 and SP02 are incapable of transduction of the small, multicopy drug resistance plasmids pUB110 and pCM194. Cloning endonuclease-generated fragments of phi 105 or SP02 DNA into each of the plasmids renders the chimeric derivatives susceptible to transduction specifically by the phage whose deoxyribonucleic acid is present in the chimera. The majority of phage deoxyribonucleic acid fragments identified that render plasmids transducible by phi 105 or SP02 appear to be internal fragments, not fragments containing the cohesive ends. However, the highest overall transduction frequency was observed in SP02-mediated transduction of a derivative of pUB110 containing a 1.6-megadalton EcoRI fragment that likely contains the SP02 cohesive ends (plasmid pPL1010). The transducing activity present in a phi 105 transducing lysate had a buoyant density slightly greater than infectious particles, whereas the majority of transducing particles in an SP02(pPL1010) transducing lysate had a buoyant density slightly less than infectious particles. Although no detectable change in plasmid structure resulted from transduction by phi 105 or SP02, deoxyribonucleic acid isolated from a purified SP02(pPL1010) transducing lysate contained no detectable monomeric pPL1010, but did contain a form of pPL1010 of higher molecular weight than the monomer.
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