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. 1983 Mar 15;210(3):699–705. doi: 10.1042/bj2100699

The association of proton movement with galactose transport into subcellular membrane vesicles of Escherichia coli.

P Horne, P J Henderson
PMCID: PMC1154280  PMID: 6307268

Abstract

1. Subcellular membrane vesicles were prepared from a strain of Escherichia coli constitutive for the GalP galactose-transport system. 2. The addition of substrates of the GalP transport system to vesicle suspensions promoted alkaline pH changes, which provided direct evidence for the coupling of sugar and proton transport. 3. Respiration-energized galactose transport was progressively inhibited at pH values above 6.0, and was abolished by agents that render the membrane permeable to protons. 4. The combined effects of valinomycin, the nigericin-like compound A217 and pH on galactose transport suggested that both delta pH and delta psi components of the protonmotive force contributed to energization of galactose transport. 5. These results substantiate the conclusion that the GalP transport system operates by a chemiosmotic mechanism.

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Selected References

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