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. 1982 Feb;149(2):733–738. doi: 10.1128/jb.149.2.733-738.1982

Lactate efflux-induced electrical potential in membrane vesicles of Streptococcus cremoris.

R Otto, R G Lageveen, H Veldkamp, W N Konings
PMCID: PMC216566  PMID: 7056700

Abstract

We developed a procedure for isolating membrane vesicles from the homolactic fermentative bacterium Streptococcus cremoris. The membrane vesicles were shown to have a right-side-out orientation by freeze-etch electron microscopy and to be free of cytoplasmic constituents. The membrane vesicles retained their functional properties and accumulated the amino acids L-leucine, L-histidine, and L-alanine in response to a valinomycin-induced potassium diffusion gradient. Studies with these membrane vesicles strongly supported the possibility that there was a proton motive force-generating mechanism by end product efflux (Michels et al., FEMS Lett. 5:357-364, 1979). Lactate efflux from membrane vesicles which were loaded with L-lactate and diluted in a lactate-free medium led to the generation of an electrical potential across the membrane. The results indicate that lactate efflux is an electrogenic process by which L-lactate is translocated with more than one proton.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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