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. 1984 Jul;159(1):63–70. doi: 10.1128/jb.159.1.63-70.1984

Energy-requiring translocation of the OmpA protein and alkaline phosphatase of Escherichia coli into inner membrane vesicles.

D B Rhoads, P C Tai, B D Davis
PMCID: PMC215593  PMID: 6203892

Abstract

In developing a reliable in vitro system for translocating bacterial proteins, we found that the least dense subfraction of the membrane of Escherichia coli was superior to the total inner membrane, both for a secreted protein (alkaline phosphatase) and for an outer membrane protein (OmpA). Compounds that eliminated the proton motive force inhibited translocation, as already observed in cells; since protein synthesis continued, the energy for translocation appears to be derived from the energized membrane and not simply from ATP. Treatment of the vesicles with protease, under conditions that did not interfere with subsequent protein synthesis, also inactivated them for subsequent translocation. We conclude that export of some proteins requires protein-containing machinery in the cytoplasmic membrane that derives energy from the proton motive force.

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