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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1989 Dec;86(24):9921–9925. doi: 10.1073/pnas.86.24.9921

Phosphatidylserine translocation to the mitochondrion is an ATP-dependent process in permeabilized animal cells.

D R Voelker 1
PMCID: PMC298614  PMID: 2602382

Abstract

Chinese hamster ovary (CHO-K1) cells were pulse labeled with [3H]serine, and the synthesis of phosphatidyl[3H]ethanolamine from phosphatidyl[3H]serine during the subsequent chase was used as a measure of lipid translocation to the mitochondria. When the CHO-K1 cells were pulse labeled and subsequently permeabilized with 50 micrograms of saponin per ml, there was no significant turnover of nascent phosphatidyl[3H]serine to form phosphatidyl[3H]ethanolamine during an ensuing chase. Saponin treatment rendered greater than 99% of the cells permeable as judged by trypan blue exclusion and depleted them of 85% of their complement of cytosolic proteins as determined by residual lactic acid dehydrogenase activity. Supplementation of the permeabilized cells with 2 mM ATP resulted in significant phosphatidyl[3H]ethanolamine synthesis (83% of that found in intact cells) from phosphatidyl[3H]serine during a subsequent 2-hr chase. Phosphatidyl[3H]ethanolamine synthesis essentially ceased after 2 hr in the permeabilized cells. The translocation-dependent synthesis of phosphatidyl[3H]ethanolamine was a saturable process with respect to ATP concentration in permeabilized cells. The conversion of phosphatidyl[3H]serine to phosphatidyl[3H]ethanolamine did not occur in saponin-treated cultures supplemented with 2 mM AMP, 2 mM 5'-adenylyl imidodiphosphate, or apyrase (2.5 units/ml) plus 2 mM ATP. ATP was the most effective nucleotide, but the addition of GTP, CTP, UTP, and ADP also supported the translocation-dependent synthesis of phosphatidyl[3H]ethanolamine albeit to a lesser extent. These data provide evidence that the interorganelle translocation of phosphatidylserine requires ATP and is largely independent of soluble cytosolic proteins.

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Selected References

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