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Development of auxotrophy by streptomycin-resistant mutation.

S L Chakrabarti, P K Maitra

    Journal of Bacteriology
    |June 1, 1974
    PubMed
    Summary

    Streptomycin resistance in E. coli mutants can lead to isoleucine dependency. These streptomycin-dependent auxotrophs also showed reduced enzyme activity and conjugation ability, linked to the strA locus.

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    Area of Science:

    • Microbiology
    • Bacterial Genetics

    Background:

    • Streptomycin resistance is a key factor in bacterial evolution.
    • Auxotrophy, the requirement for specific nutrients, can arise from genetic mutations.

    Purpose of the Study:

    • To investigate the genetic basis of isoleucine requirement in streptomycin-resistant Escherichia coli mutants.
    • To characterize the phenotype of these auxotrophic mutants.

    Main Methods:

    • Isolation and characterization of streptomycin-resistant Escherichia coli mutants.
    • Phenotypic analysis including enzyme activity assays (beta-galactosidase, aldolase) and conjugation experiments.
    • Genetic analysis to identify the causative mutation locus.

    Main Results:

    • Several streptomycin-resistant mutants requiring isoleucine were identified.
    • Most mutants exhibited streptomycin-dependent growth and auxotrophy.
    • These strains showed deficiencies in beta-galactosidase and aldolase production and impaired conjugation.
    • Genetic mapping implicated the strA locus as responsible for the isoleucine requirement.

    Conclusions:

    • A mutation at the strA locus in Escherichia coli can confer both streptomycin resistance and isoleucine auxotrophy.
    • Streptomycin-dependent auxotrophy is associated with pleiotropic effects on enzyme production and conjugation in these mutants.

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