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Within minutes of Bdellovibrio bacteriovorus attack on prey cells, such as Escherichia coli, the cytoplasmic membrane of the prey is altered. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of purified invaded prey cell (bdelloplast) membranes revealed the appearance of a noncytoplasmic membrane protein. This protein is not observed in preparations of noninvaded E. coli membranes and migrates in a manner similar to that of E. coli OmpF. Isoelectric focusing and two-dimensional gel electrophoresis of bdelloplast cytoplasmic membrane preparations also revealed the presence of a protein with electrophoretic properties similar to those of OmpF and the major Bdellovibrio outer membrane proteins. The protein appears in cytoplasmic membrane preparations within minutes of attack and persists throughout most of the intraperiplasmic developmental cycle. The appearance of this protein is consistent with our hypothesis that bdellovibrios translocate a pore protein into the bdelloplast cytoplasmic membrane to kill their prey and to gain access to the cytoplasmic contents for growth.

Translocation of an outer membrane protein into prey cytoplasmic membranes by bdellovibrios