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. 1972 May;110(2):468–476. doi: 10.1128/jb.110.2.468-476.1972

Influence of Magnesium and Manganese on Some Biological and Physical Properties of Tetracycline

David Sompolinsky 1,2, Zemira Samra 1,2
PMCID: PMC247437  PMID: 4553832

Abstract

Accumulation of 3H-tetracycline in nonproliferating cells of susceptible and resistant strains of Escherichia coli and Staphylococcus aureus in tris(hydroxymethyl)aminomethane (Tris) buffer (10 mm, pH 7.5) was significantly decreased in the presence of 5 to 40 mm MgCl2 and increased in the presence of 5 to 10 mm MnCl2. When the bacteria first accumulated 3H-tetracycline in plain Tris·HCl, and the metal salts were thereafter added, a prompt decrease or increase in radioactivity of the cells was observed after the addition of Mg2+ or Mn2+, respectively. In phosphate buffer (10 mm, pH 7.5), the effect of Mg2+ was delayed. Three minutes after addition of 3H-tetracycline, uptake was as in the control cell suspension, but thereafter it dropped rapidly. When 3H-tetracycline was incubated with Mg2+ before addition to the bacterial suspension, uptake was scarcely measurable. The addition of Mg2+ to growing cultures of S. aureus and E. coli caused a marked decrease in susceptibility; in contrast, no increase in susceptibility could be demonstrated when Mn2+ was added. It was also demonstrated that Mg2+ and Mn2+ had distinct influences on the absorption spectrum, the optical rotatory dispersion, the circular dichroism, and the lipid solubility of tetracycline.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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