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In a mutation experiment with a rough, ampicillin-resistant strain, we isolated two smooth mutants which were both sensitive to ampicillin and carried defects in the cell envelope. One of the strains (with theenvA gene) is hindered in its completion of septa and forms chains of cells. TheenvA gene has been mapped to a position betweenleu andproB , at 2 to 4 min. TheenvA gene decreased the resistance mediated by both episomal and chromosomal genes for resistance to several antibiotics. During growth theenvA mutant was characterized by abnormal ratios between viable count or cell count and optical density. The ratio between viable count and optical density was affected during shift-up and shift-down experiments. When compared to the parent strain, theenvA mutant was found to be more resistant to ultraviolet irradiation on plates. Prestarvation for tryptophan had a protective effect against irradiation both on the parent strain and theenvA mutant.

journal of bacteriology

Mutant of <i>Escherichia coli</i> with Anomalous Cell Division and Ability to Decrease Episomally and Chromosomally Mediated Resistance to Ampicillin and Several Other Antibiotics

Mutant of Escherichia coli with Anomalous Cell Division and Ability to Decrease Episomally and Chromosomally Mediated Resistance to Ampicillin and Several Other Antibiotics