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High Frequency Transduction by Phage Hybrids Between Coliphage ø80 and Salmonella Phage P22

¹ Department of Microbiology and Immunology, Hahnemann Medical College and Hospital, Philadelphia, Pennsylvania 19102
² Department of Biological Chemistry
and³ Department of Bacterial Immunology, Walter Reed Army Institute of Research, Washington, D.C. 20307-5100, U.S.A.

ø80immP22dis, a hybrid between ø80 and P22, carries all the late genes of ø80 and most of the P22 early region including the immC and immI bipartite immunity loci. The presence of the immI region allows this hybrid to grow on lysogens of ø80immP22 hybrids which have the immC locus, but not the immI locus. In addition to these P22 immunity regions, ø80immP22dis contains the P22att marker so that the prophage can be inserted into the chromosomal P22 attachment site adjacent to the proA-proB region of the host. Unlike its ø80 parent which performs specialized transduction of the trp region, ø80immP22dis transduces markers located adjacent to its attachment site to Escherichia coli K12 recipients at high frequencies (0.3% for argF and 0.18% for proA). Induction of ø80immP22dis lysogens yields new hybrid phage clones which have incorporated E. coli K12 chromosomal segments in place of the P22 immI to att segment. Having lost the immI region, the new hybrids no longer grow in ø80immP22 lysogens. These new hybrids, termed ø80immP22dis^-, possess specialized transducing properties, transferring the argF and proA markers at higher frequencies (21% for argF and 12% for proA) than previously obtained with the ø80immP22dis phage.

Keywords: ø80, P22, phage hybrids, transduction

Received 15 November 1984; accepted 4 April 1985.