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Phosphatidylglycerol (PG) an important membrane phospholipid required for the synthesis of diphos-phatidylglycerol (DPG) commonly known as cardiolipin (CL) was identified in the fraction of endo-plasmic reticulum (ER)-derived transport vesicles which had no affinity for Golgi. The vesicles were produced in the presence of Brefeldin A (BFA), the agent known to inhibit ER-Golgi transport, and found to display affinity to mitochondria. The analysis revealed that their cargo was not containing proteins that are transported to Golgi, and that their membrane was free of phosphatidylinositol (PI) and ceramides (Cer). The incubation of PG-containing transport vesicles with mitochondria afforded incorporation of their membrane into the Outer Mito-chondrial Membrane (OMM) and formation of lyso-phosphatidylglycerol (LPG). In turn, upon further incubation with fresh transport active cytosol, the mitochondrial LPG was converted to PG. The results of analysis of the OMM, Inner Mitochondrial Mem-brane (IMM) and Inner Mitochondrial Space Components (IMSC) strongly suggest that PG-containing transport vesicles deliver nuclear DNA translation products to the IMSC and thus facilitate CL synthesis in the IMM. In summary, our studies provide evidence that ER-generated PG-enriched transport vesicles represent the general pathway for restitution of mitochondrial membranes and the delivery of nuclear DNA translation products that generate CL, and thus sustain the mitochondrial matrix CL-dependent metabolic reactions

advances in biological chemistry

Phosphatidylglycerol-containing ER-transport vesicles built and restore outer mitochondrial membrane and deliver nuclear DNA translation products to generate cardiolipin in the inner mitochondrial membrane