Phosphatidylglycerol (PG) is synthesised at the inner mitochondrial (IM) membrane, phosphatidic acid (PA) and cytidine triphosphate (CTP) are converted into cytidine diphosphate-diacylglycerol (CDP-DAG), which in turn is converted with glycerol-3-phosphate (G3P) into phosphatidylglycerophosphate (PGP) and cytidine monophosphate (CMP). Finally, PGP is dephosphorylated to PG. In addition, PG can be synthesised at the endoplamic reticulum (ER) membrane when phospholipase D transphosphatidylates phosphatidylcholine (PC) with glycerol to displace choline (Cho) and form PG (Piazza & Marmer 2007, Stuhne-Sekalec et al. 1986, Lykidis et al. 1997, Cao & Hatch 1994).