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J Bacteriol. 1980 December; 144(3): 884-890

Overproduction of outer membrane protein suppresses envA-induced hyperpermeability.

ABSTRACT

A quantitative study on outer membrane components was performed in a number of envelope mutants of Escherichia coli K-12 exhibition different permeability properties for antimicrobial agents. The envA1 allele causing an increased influx for both hydrophobic and hydrophilic drugs was found to be associated with a deficiency in the amount of lipopolysaccharides. The sefA1 envA1 double mutant was found to have a higher outer membrane buoyant density, apparently due to an increase in protein content. This double mutant was still low in lipopolysaccharide content.

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