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. 1975 Oct;124(1):470–475. doi: 10.1128/jb.124.1.470-475.1975

Localization of D-lactate dehydrogenase in membrane vesicles prepared by using a french press or ethylenediaminetetraacetate-lysozyme from Escherichia coli.

M Futai, Y Tanaka
PMCID: PMC235915  PMID: 809422

Abstract

The localization of D-lactate dehydrogenase in membrane vesicles prepared from Escherichia coli was studied using antibody against the purified enzyme. The activity of D-lactate dehydrogenase and D-lactate-dependent oxygen uptake of membrane vesicles prepared by using a French press were completely inhibited by this antibody, suggesting that the enzyme is localized on the outside of these vesicles. This and previous results (Futai, 1974) strongly indicate the inversion of these vesicles. The D-lactate dehydrogenase and D-lactate-dependent oxygen uptake of membrane vesicles prepared by treatment with ethylenediaminetetraacetate-lysozyme were inhibited about 15% by the antibody, whereas proline transport of the vesicles was insensitive to antibody. These results suggest that most of the membrane vesicles have D-lactate dehydrogenase on the inside of the membrane and that such vesicles transport amino acids. This essentially confirms the results of Short, Kaback, and Kohn (1975). However, unlike them we observed that a small but significant portion of activity was sensitive to the antibody as shown above. This portion may represent the completely inverted vesicles in the preparation. Ferricyanide reductase activity cannot be detected in spheroplasts, but about 30 to 50% of the total was detected in membrane vesicles prepared by treatment with ethylenediaminetetraacetate. This confirms our previous findings with membrane prepared by a slightly different procedure. It is concluded that in these vesicles about half the reactive sites for ferricyanide are moved from inside to outside the membrane, whereas 85% of the D-lactate dehydrogenase remains inside the membrane.

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Selected References

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