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. 1978 Dec;136(3):1084–1093. doi: 10.1128/jb.136.3.1084-1093.1978

Properties of lambda transducing bacteriophages carrying R100 plasmid DNA: mercury resistance genes.

W B Dempsey, S A McIntire, N Willetts, J Schottel, T G Kinscherf, S Silver, W A Shannon Jr
PMCID: PMC218544  PMID: 363687

Abstract

Three lambdamer (resistance to Hg2+ and mercurials) transducing phages were prepared from three independent cointegrate isolates of bacteriophage lambda and plasmid R100. DNA heteroduplex and restriction nuclease analyses of the lambdamer DNA showed that all three phages had resulted from lambda insertion at kilobase coordinate 8.6 of plasmid R100, followed by loss of different lengths of lambda DNA and replacement with different lengths of R100 DNA. Two of the lambdamer phages were defective, containing deletions from lambdaatt through the lambdaN gene and into the lambdarex gene; the third, VAlambda14, was an N+ Spi- plaque-forming phage. With VAlambda14, N-dependent transcription of R100 mer from the lambdapL promoter suggested that transcription of mer proceeded in the direction from IS1b toward the sulfonamide resistance determinant (i.e., from a plasmid promoter in restriction nuclease fragment EcoRI-H toward fragment EcoRI-I). Phage-directed protein synthesis in a UV-irradiated lambdaind- lysogen showed the Hg2+-inducible synthesis of three major polypeptides of molecular weights 68,000, 11,500, and 8,500 and three minor ones of molecular weights 54,000, 33,000, and 13,500. The largest of the major polypeptides is identified as the subunit of the mercuric reductase enzyme. The functions of the smaller polypeptides are not known. Hg2+ reductase enzyme assays confirmed the regulation of mer synthesis during phage infection.

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Selected References

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