PMID:4919471
| Citation |
White, RJ and Kent, PW (1970) An examination of the inhibitory effects of N-iodoacetylglucosamine on Escherichia coli and isolation of resistant mutants.Biochem. J. 118:81-7 |
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| Abstract |
1. After incubation of Escherichia coli with N-iodo[1,2-(14)C(2)]acetylglucosamine, 95-99% of the (14)C taken up by whole cells is located in a cold-trichloroacetic acid-soluble fraction. Two major components of this fraction are S-carboxymethylcysteine and S-carboxymethylglutathione. The same compounds accumulate during incubation with iodo[(14)C]acetate but not with iodo[(14)C]acetamide. The amount of (14)C associated with a cold-trichloroacetic acid-insoluble fraction are comparable for all three alkylating agents. After incubation with iodo[(14)C]acetamide, 50% of the label bound to whole cells is recoverable in a cold-trichloroacetic acid-insoluble fraction. 2. Uptake and incorporation of (14)C from [U-(14)C]glycerol is blocked at an early stage by N-iodoacetylglucosamine. No specific inhibition of macromolecular synthesis could be demonstrated. 3. Mutants selected for resistance to iodoacetate are partially resistant to iodoacetate and N-iodoacetylglucosamine, but show no resistance to iodoacetamide. 4. Mutants selected for resistance to N-iodoacetylglucosamine are not resistant to iodoacetate or iodoacetamide, and are defective in their ability to grow on N-acetylglucosamine. Resistance to N-iodoacetylglucosamine is not absolute, and depends on the presence of glucose or certain other sugars; there is no resistance during growth on maltose, glycerol or succinate. 5. Absolute resistance can be achieved by selecting for a second mutation conferring resistance during growth on maltose; double mutants isolated by this procedure are unable to grow on N-acetylglucosamine and grow poorly on glucosamine. Resistant single mutants have a slightly diminished uptake of N-acetyl[1-(14)C]glucosamine, but in resistant double mutants the uptake of both [1-(14)C]glucosamine and N-acetyl[1-(14)C]glucosamine is severely diminished. 6. These observations are consistent with the presence of two permeases for N-acetylglucosamine, one that also permits uptake of glucosamine and another that allows entry of methyl 2-acetamido-2-deoxy-alpha-d-glucoside. N-Iodoacetylglucosamine can gain entry to the cell by both permeases. |
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| Keywords |
Carbon Isotopes; Chromatography, Gel; Drug Resistance, Microbial; Escherichia coli; Glucosamine; Glycerol; Hexoses; Iodoacetates; Membrane Transport Proteins; Mutation; Trichloroacetic Acid |
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Main Points of the Paper
Please summarize the main points of the paper.
Materials and Methods Used
Please list the materials and methods used in this paper (strains, plasmids, antibodies, etc).
Phenotype Annotations
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| Phenotype of | Taxon Information | Genotype Information (if known) | Condition Information | OMP ID | OMP Term Name | ECO ID | ECO Term Name | Notes | Status |
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a mutation or genetic difference within a strain |
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ECO:0000182 |
in vitro culture assay data |
Resistance to Iodoacetylglucosamine resistance, table 4 |
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a mutation or genetic difference within a strain |
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ECO:0000182 |
in vitro culture assay data |
Resistance to Iodoacetylglucosamine resistance, table 4 |
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a mutation or genetic difference within a strain |
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ECO:0000182 |
in vitro culture assay data |
Resistance to Iodoacetylglucosamine resistance, table 4 |
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Notes
Waiting on appropriate OMP term to be made because N-Acetylglucosamine is an amide between glucosamine and acetic acid.
References
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