Isolation of a Specialized Lambda Transducing Bacteriophage Carrying the Beta Subunit Gene for Escherichia coli Ribonucleic Acid Polymerase

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RESUMO

A heat-inducible lysis-defective λ prophage has been integrated directly into the E. coli chromosome at a site (bfe) very closely linked to the ribonucleic acid polymerase mutation rifd, a dominant rifampin resistance allele. This unusual lysogen has facilitated the isolation of specialized transducing phages conferring rifampin resistance to sensitive cells, and carrying at least the β subunit gene of RNA polymerase in intact form.

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