PMID:104974

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Citation

Hardaway, KL and Buller, CS (1979) Effect of ethylenediaminetetraacetate on phospholipids and outer membrane function in Escherichia coli.J. Bacteriol. 137:62-8

Abstract

Treatment of Escherichia coli K-12 strain S15, containing a normal amount of phospholipase A, with ethylenediaminetetraacetate (EDTA) resulted in an increase in sensitivity of the organism to actinomycin D. Strain S17, a mutant deficient in both detergent-resistant phospholipase A and detergent-sensitive phospholipase A, was considerably less sensitive to the antibiotic after the treatment. Both strains released lipopolysaccharide after EDTA treatment, indicating that this outer membrane component alone is not the barrier to actinomycin in these organisms. The phospholipase A-deficient strain released less alkaline phosphatase, a periplasmic enzyme. EDTA treatment of S15 resulted in the accumulation of free fatty acids, indicative of phospholipase A activation. Cells briefly treated with EDTA regained the barrier to actinomycin when incubated in growth media, and the cessation of the accumulation of free fatty acids was in approximate temporal agreement with restoration of the barrier. Cells in which phospholipase A was activated by brief exposure to EDTA synthesized relatively more phosphatidylethanolamine than did untreated cells in the initial period after dilution into growth media. These experiments suggest that the EDTA-induced loss of outer membrane barrier function of E. coli K-12 is mediated through the activation of phospholipase A.

Links

PubMed

Keywords

Alkaline Phosphatase; Cell Membrane; Dactinomycin; Edetic Acid; Escherichia coli; Lipopolysaccharides; Membrane Lipids; Phospholipases; Phospholipids

Main Points of the Paper

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Materials and Methods Used

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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

a mutation or genetic difference within a strain

  • Taxon: Escherichia coli
  • Strain: K-12
  • Substrain: S17
  • NCBI Taxon ID: 83333
  • Genotype of Reference Strain: pldA
  • Genotype of Experimental Strain : pldA
  • Reference Condition: no EDTA
  • Experimental Condition: Presence of EDTA
OMP:0000276

increased resistance to antimicrobial compound

ECO:0000182

in vitro culture assay data

Mutant deficient in both detergent-resistant phospholipase A and detergent-sensitive phospholipase A are resistant to Actinomycin D in the presence of EDTA.

a mutation or genetic difference within a strain

  • Taxon: Escherichia coli
  • Strain: K-12
  • Substrain: NL101
  • NCBI Taxon ID: 83333
  • Genotype of Reference Strain: pldA
  • Genotype of Experimental Strain : pldA
  • Reference Condition:
OMP:0000276

increased resistance to antimicrobial compound

ECO:0000182

in vitro culture assay data

Resistant to actinomycin D in the presence of EDTA


Notes

References

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