Influence of outer membrane mutations on susceptibility of Escherichia coli to the dibasic macrolide azithromycin.

Abstract excerpt

Azithromycin differs chemically from erythromycin by having an extra positive charge created by the presence of a methyl-substituted nitrogen in the 15-membered macrolide ring. This results in substantially increased potency against Gram-negative bacteria. Therefore, the possibility was considered that azithromycin was taken across the outer membrane of Escherichia coli by the self-promoted uptake route, which is...

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