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J. Biol. Chem., Vol. 266, Issue 13, 7978-7981, 05, 1991

Involvement of contact sites in phosphatidylserine import into liver mitochondria

D Ardail, F Lerme and P Louisot
Department of Biochemistry, University of Lyon, Lyon-Sud Medical School, France.

The synthesis, translocation, and decarboxylation of phosphatidylserine can occur in a cell-free system (Voelker, D. R. (1989) J. Biol. Chem. 264, 8019-8025). We made use of the spatial separation of the site of biosynthesis and the site of decarboxylation of phosphatidylserine to demonstrate that mitochondrial contact sites are intimately involved in the translocation of phosphatidylserine prior to decarboxylation. In that sense, the inhibition of phosphatidylserine decarboxylase leads to an accumulation of this phospholipid in the contact site-enriched fractions without mixing the inner membrane phospholipid pool. On the other hand, newly synthesized phosphatidylethanolamine can be exported very rapidly to the mitochondrial surface in the same way, i.e. via contact sites. These data provide further evidence for the existence of a structural and functional microcompartmentation at the inner mitochondrial membrane surface.
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