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. 1990 Dec 15;272(3):589–595. doi: 10.1042/bj2720589

Lysocardiolipin formation and reacylation in isolated rat liver mitochondria.

M Schlame 1, B Rüstow 1
PMCID: PMC1149749  PMID: 2268287

Abstract

Liver mitochondrial cardiolipin (CL) is distinguished from other phospholipids by the presence of linoleoyl in almost all molecular species, and the biosynthesis of these species is not yet understood. The present study was carried out in order to test the hypothesis that the linoleoyl proportion of CL may be specifically enriched by a deacylation-reacylation cycle. Incorporation of [14C]glycerol 3-phosphate into the metabolites of the CL pathway was accompanied by formation of 14C-labelled monolyso- and dilyso-CL. Labelling of dilyso-CL was increased or decreased by stimulation or inhibition respectively of mitochondrial phospholipase A2. These data suggest a rapid deacylation of newly formed [14C]CL by phospholipase A2, whereas endogenous mitochondrial CL was very resistant to hydrolytic degradation. Unlike dilyso-CL, monolyso-CL could be reacylated by [14C]linoleoyl residues. [14C]Linoleoyl incorporation into CL was also observed when exogenous CL was added instead of monolyso-CL, thus indicating the concerted action of de- and re-acylation. Although 1-palmitoyl-2-[14C]linoleoyl-phosphatidylcholine was a suitable acyl donor under experimental conditions, the reaction was not a transacylation but required splitting of [14C]linoleic acid from phosphatidylcholine and formation of [14C]linoleoyl-CoA as an intermediate. The [14C]linoleoyl was mainly bound to the sn-2(2") position of CL, and a small portion (about 20%) to the sn-1(1") position. It is concluded that a cycle, comprising CL deacylation and monolyso-CL reacylation by linoleoyl-CoA, provides a potential mechanism for the remodelling of molecular species of newly formed CL.

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Selected References

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