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A thymine-requiring mutant of Staphylococcus aureus, strain 8325 (PI258)thy, undergoes prophage induction and lysis after thymine starvation. Four different phages were isolated from the lysate in low titers, among which was a phage designated phi 14, which differs from phage phi 11 in its immunity locus. The thymineless induced lysates of strain 8325(PI258)thy transduce the penicillinase plasmid at high frequency (10(-1), whereas transduction of chromosomal markers is inefficient. A plasmic-cured derivative of strain 8325(PI258)thy is also lysed by thymine starvation and be used for high-frequency transduction of other plasmids. Reconstitution of a strain of S. aureus that responds to thymine starvation was only partially successful, but this system can effectively be used to transduce plasmids or plasmid derivatives.

journal of virology

Thymineless bacteriophage induction in Staphylococcus aureus. I. High-frequency transduction with lysates containing a bacteriophage related to bacteriophage phi 11