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  • Title: Characterization and mobilization of nonconjugative plasmids encoding resistance to streptomycin and sulfanilamide.
    Author: Araki Y, Inoue M, Hashimoto H.
    Journal: Microbiol Immunol; 1987; 31(11):1107-11. PubMed ID: 3444425.
    Abstract:
    Most of nonconjugative streptomycin (Sm)- and sulfanilamide (Su)- resistance of clinical isolates belonging to various species of Enterobacteriaceae and Pseudomonas were encoded by an Inc Q plasmid, molecular size of which was 5.5 Md. The SmSu plasmids were efficiently mobilized by Inc P plasmids between E. coli strains. Inc I group and Inc F group plasmids could mobilize the Inc Q plasmids at lower efficiencies. The Inc Q plasmid was also mobilized to various species of Enterobacteriaceae at high frequencies without accompanying the conjugative Inc P plasmid; as a result, most of the SmSu-resistant transconjugants were nontransferable. The above results may explain the wide distribution of nonconjugative SmSu strains among clinical isolates.
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