Abstract
The permeability function the cell wall of gram-negative bacteria such as Salmoenlla was investigated by producing cells with an expanded periplasmic volume, and incubating them with radioactive non-utilizable oligo- and polysaccharides or polyethylene glycols. To quantitative the extent of penetration of these hydrophilic compounds into the periplasm, the radioactivity of the cell pellet was determined after centrifugation. We found that only di- and trisaccharides could fully diffuse into the periplasm, whereas higher-molecular-weight saccharides were nonpenetrable. In addition, low-molecular-weight polyethylene glycols rapidly diffused across the cell wall. Kinetics experiments also showed that both sucrose and raffinose in the periplasm exchanged rapidly with sugars in the medium, even at 0 degrees C. These results suggest that the cell wall acts as a molecular sieve, with an exclusion limit near 550 to 650 daltons for saccharides. We also suggest that the diffusion of these hydrophilic compounds most likely occurs through water-filled pores present in the cell wall of gram-negative bacteria.
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Selected References
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