The periseptal annulus in Escherichia coli

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Abstract
Evidently, 2 circumferential zones of cell envelope differentiation, the periseptal annuli, exist in E. coli as previously observed in Salmonella typhimurium. The periseptal annulus is located at the division site of cells. A strain overproducing a periplasmic protein, PhoS (phosphate-binding protein), was used to provide a landmark for the periseptal compartment. The zone of adhesion does not involve inner-outer membrane fusion. This zone does not provide a strong physical barrier to protein diffusion in the periplasmic space, at least under conditions of plasmolysis.