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The mechanism of resistance to streptomycin inEscherichia coli. Functional analysis of the permeability barrier of cells harbouring the Rldrd-19Km plasmid

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Abstract

The mechanism of phenotypically altered SM resistance in mutants ofEscherichia coli JC5455 (Rldrd-19Km-)lrs and JC5455 (pON5300) was compared with that of the standard strain JC5455(@#@ Rldrd-19Km-). On analyzing the membrane polypeptides in polyacrylamide gel both mutants were found to possess a protein spectrum different from that of the standard strain. Transport of D-xylose and L-arginine was the same in all strains, transport of L-proline was decreased in J05455 (pON5300) which may indicate a mutational interference with energy metabolism. The basic uptake of dihydrostreptomycin was the same in all strains but there were differences after preincubation of cells with streptomycin or glucose. The increased resistance of JC5455 (Rldrd-19Km-)lrs may be due to observed quantitative differences in membrane polypeptides that might play a role in the binding and functional expression of aminoglycoside-3’-adenylyl transferase which modifies streptomycin. The increased sensitivity toward streptomycin in JC5455 (pON5300) can be explained by a mutation due to N-methyl-N’-nitro-N-nitrosoguanidine in the host cell since this change of sensitivity to streptomycin could not be transferred by transformation into a nonmutagenized strain. The coincidence of inducibility of increased transport of streptomycin by this antibiotic and the altered frequency of reversion to high levels of streptomycin resistance in JC5455 (pON5300) and in the transformant JC5455 (pON5302) may indicate that the altered reversibility toward phenotypically high resistance to streptomycin is a property of pON5300 and is transferred by transformation.

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Abbreviations

SM:

streptomycin

MIC:

minimum inhibitory concentration

CM:

chloramphenicol

KM:

kanamycin

SU:

sulphonamides

AP:

ampicillin

MNNG:

N-methyl-N’-nitro-N-nitrosoguanidine

r:

resistant

s:

sensitive

SDS:

sodium dodecyl sulphate

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Authors and Affiliations

  1. Department of Molecular Biology and Genetics, Czechoslovak Academy of Sciences, 142 20, Prague 4

    H. Braná, J. Hubáček & I. Holubová

  2. Department of Cell physiology, institute of Microbiology, Czechoslovak Academy of Sciences, 142 20, Prague 4

    A. Kotyk & D. Michaljaničová

Authors
  1. H. Braná
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  2. J. Hubáček
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  3. A. Kotyk
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  4. D. Michaljaničová
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  5. I. Holubová
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Braná, H., Hubáček, J., Kotyk, A. et al. The mechanism of resistance to streptomycin inEscherichia coli. Functional analysis of the permeability barrier of cells harbouring the Rldrd-19Km plasmid. Folia Microbiol 26, 345–350 (1981). https://doi.org/10.1007/BF02927325

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  • DOI: https://doi.org/10.1007/BF02927325

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