Biosynthesis of phosphatidylglycerol and phosphatidylglycerolphosphate in submitochondrial membranes isolated from guinea pig liver is absolutely dependent on CDP-diglycerides imported from microsomal membranes.

The biosynthesis of radioactively labelled phosphatidylglycerol via phosphatidylglycerophosphate in outer and inner mitochondrial membranes isolated from guinea pig liver was found to depend absolutely on CDP-diglycerides, which could not be biosynthesized in these membranes. The requirement for CDP-diglycerides in the biosynthesis of labelled phosphatidylglycerol could be fulfilled by the transfer of biosynthesized [3H]CDP-diglycerides from the microsomal membranes to the outer and inner mitochondrial membranes.