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. 1994 Nov 8;91(23):10938–10942. doi: 10.1073/pnas.91.23.10938

Reconstitution of ATP-dependent aminophospholipid translocation in proteoliposomes.

M E Auland 1, B D Roufogalis 1, P F Devaux 1, A Zachowski 1
PMCID: PMC45141  PMID: 7971987

Abstract

In addition to ion-pumping ATPases, most plasma membranes of animal cells contain a Mg2+ ATPase activity, the function of which is unknown. This enzyme, of apparent molecular mass 110 kDa, was purified from human erythrocyte membranes by a series of column chromatographic procedures after solubilization in Triton X-100. When reincorporated into artificial bilayers formed from phosphatidylcholine, it was able to transport a spin-labeled phosphatidylserine analogue from the inner to the outer membrane leaflet provided Mg2+ ATP was present in the incubation mixture. The ATP-dependent transport of the phosphatidylethanolamine analogue required the presence of an anionic phospholipid (e.g., phosphatidylinositol) in the outer membrane leaflet. In contrast the transmembrane distribution of spin-labeled phosphatidylcholine was unaffected in the same experimental conditions. This transmembrane movement of aminophospholipid analogues was inhibited by treatment of the proteoliposomes with a sulfhydryl reagent. We conclude that the Mg2+ ATPase is sufficient for the biochemical expression of the aminophospholipid translocase activity, which is responsible for the inward transport of phosphatidylserine and phosphatidylethanolamine within the erythrocyte membrane. The presence of this transport activity in many animal cell plasma membranes provides a function for the Mg2+ ATPase borne by these membranes.

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Selected References

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