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Specialized transducing phages for gluconate 6-phosphate dehydrogenase (gnd ), a constitutive enzyme inEscherichia coli , have been isolated using a method previously described for other genes. Thegnd-his region, carried on an F′ episome, was first transposed totonB . Rare phages carryinggnd were selected, by transduction, from φ80 lysogens of these strains; one phage also carriedhis (φ80gndhis ). From the transductants, high-frequency transducing lysates were obtained; low multiplicity of infection then yielded defective lysogens.tonB deletion analysis of the φ80dgndhis lysogen shows the order of genes in the prophage to beimm80...hisOGD...gnd; according to a marker rescue experiment most phage late genes have been replaced by bacterial deoxyribonucleic acid. A heat-inducible, lysis-defective λ-φ80 hybrid derivative of φ80dgndhis has been prepared.

Isolation of Specialized Transducing Bacteriophages for Gluconate 6-Phosphate Dehydrogenase (gnd) ofEscherichia coli