Effects of magnesium and sodium ions on the outer membrane permeability of cephalosporins in Escherichia coli

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Abstract

Both Mg2+ and Na+ stimulated the outer membrane permeation of negatively charged cephalosporins in Escherichia coli without any significant alteration of the permeation of a zwitterionic cephalosporin. Such stimulation was not observed in an E. coli mutant lacking porins. The stimulation was caused by the direct interaction between the cations and the porin pores, which resulted in a decrease in cation selectivity of both the Omp F and Omp C porin pores. © 1986.

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Yamaguchi, A., Yanai, M., Tomiyama, N., & Sawai, T. (1986). Effects of magnesium and sodium ions on the outer membrane permeability of cephalosporins in Escherichia coli. FEBS Letters, 208(1), 43–47. https://doi.org/10.1016/0014-5793(86)81528-9

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