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. 1985 Nov;82(22):7555–7559. doi: 10.1073/pnas.82.22.7555

Incorporation of beef heart cytochrome c oxidase as a proton-motive force-generating mechanism in bacterial membrane vesicles.

A J Driessen, W de Vrij, W N Konings
PMCID: PMC391371  PMID: 2999769

Abstract

Membrane vesicles derived from the strictly fermentative lactic acid bacterium Streptococcus cremoris have been fused with proteoliposomes containing the beef heart mitochondrial cytochrome c oxidase by means of a freeze/thaw-sonication technique. Evidence that fusion has taken place was obtained by freeze-etch electron microscopy, showing a less-dense intramembranous particle distribution in the fused membranes than in the bacterial membranes, and by sucrose gradient centrifugation, indicating a buoyant density of the majority of the membranes after fusion that was between the buoyant densities of the starting membrane preparations. In the fused membranes, 55-60% of the cytochrome c oxidase molecules are oriented with the cytochrome c binding site at the outer surface of the membrane. With the electron-donor system ascorbate/N,N,N',N'-tetramethyl-p-phenylenediamine/cytochrome c, a high proton-motive force (greater than 130 mV), inside negative and alkaline, can be generated in the fused membrane, and this proton-motive force can drive secondary transport of several amino acids. The procedure described can be used for incorporating a proton-motive force-generating system in isolated membrane vesicles from bacterial or eukaryotic origin that lack a suitable primary proton pump.

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