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J. Bacteriol., 11 1995, 6176-6183, Vol 177, No. 21
Copyright © 1995, American Society for Microbiology

A periplasm in Bacillus subtilis

R Merchante, HM Pooley and D Karamata
Institut de Genetique et de Biologie Microbiennes, Lausanne, Switzerland.

The possibility of there being a periplasm in Bacillus subtilis, in the distinct cell compartment bounded by the cytoplasmic membrane and the thick cell wall, has been investigated quantitatively and qualitatively. Cytoplasmic, membrane, and protoplast supernatant fractions were obtained from protoplasts which were prepared isotonically from cells grown under phosphate limitation. The contents of the protoplast supernatant fraction represent an operational definition of the periplasm. In addition, this cell fraction includes cell wall-bound proteins, exoproteins in transit, and contaminating cytoplasmic proteins arising through leakage from, or lysis of a fraction of, protoplasts. The latter, measured by assay of enzyme markers and by radiolabeled RNA and protein, was found to represent 7.6% of total cell protein, yielding a mean of 9.8% +/- 4.8% for B. subtilis 168 protein considered periplasmic. Qualitatively, after subjection of all cell fractions to polyacrylamide gel electrophoresis, RNase and DNase, zymographs revealed that (i) each cell fraction had a unique profile of nucleases and (ii) multiple species and a major fraction of both nucleases were concentrated in the periplasm. We conclude that the operationally defined periplasmic fraction corresponds closely, both quantitatively and qualitatively, to the contents of the periplasm of Escherichia coli. We discuss evidence that the maintenance of the components of this surface compartment in B. subtilis is compatible with the thick negatively charged cell wall acting as an external permeability barrier.

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