Transduction analysis of transposon Tn551 insertions in the trp-thy region of the Staphylococcus aureus chromosome (original) (raw)

Abstract

Previous studies have shown that Tn551, a 5.2-kilobase-pair transposon that determines constitutive resistance to erythromycin, can occupy a variety of chromosomal sites between thy-101 and trp-103 in Staphylococcus aureus 8325. Although many of these insertions were "silent," many others, including lys, thr, met, tyr, and trp, resulted in auxotrophic mutations. The close proximity and erythromycin-resistant phenotypes of the insertions in this region have made their mapping by transformation difficult. Analysis of these sites and similar chemically induced mutations by generalized transduction with phage 80 alpha have defined the order and relationship of these insertion sites and provided a detailed map of this region of the chromosome, including the orientation of the trp operon. The results of this study and a limited phenotypic characterization of the mutants have shown that the divergent pathway from aspartate to lysine, threonine, and methionine, several reactions in tyrosine biosynthesis, and the entire tryptophan operon are determined by this region of the chromosome. The linkage results obtained by transduction have been compared with similar data obtained previously by transformation; this comparison suggests the existence, between thy and lys, of a preferred headful cutting site for transducing phage DNA morphogenesis from the host chromosome.

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Selected References

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