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. 1984 Feb;157(2):385–390. doi: 10.1128/jb.157.2.385-390.1984

Permeability of the boundary layers of Bdellovibrio bacteriovorus 109J and its bdelloplasts to small hydrophilic molecules.

W H Cover, R J Martinez, S C Rittenberg
PMCID: PMC215259  PMID: 6363383

Abstract

Measurements of the sucrose-permeable and -impermeable volumes during Bdellovibrio bacteriovorus attack on Escherichia coli or Pseudomonas putida showed that the volume of the bdelloplast increased over that of the substrate cell. Although the pattern of the increase differed with the two organisms, the volumes reached maximum at about 60 min into the bdellovibrio growth cycle. By this time, the cytoplasmic membranes of the attacked cells were completely permeable to sucrose. The kinetics of increase in sucrosepermeable volumes were similar to the kinetics of attachment and penetration (Varon and Shilo, J. Bacteriol. 95:744-753, 1968). These data show that the original cytoplasmic and periplasmic compartmentalization of the substrate cell ceases to exist with respect to small hydrophilic molecules during bdellovibrio attack. In contrast, the effective pore size of the outer membrane of the substrate cell to small oligosaccharides remains unaltered during bdelloplast formation as was shown by direct measurements of its exclusion limits. The major porin protein of E. coli, OmpF, was recoverable from the bdelloplast outer membrane fraction until the onset of lysis. The Braun lipoprotein was removed from the bdelloplast wall early, and OmpA was lost in the terminal part of the bdellovibrio growth cycle.

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Selected References

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