The role of lipoteichoic acid biosynthesis in membrane lipid metabolism of growing Staphylococcus aureus - PubMed (original) (raw)
The role of lipoteichoic acid biosynthesis in membrane lipid metabolism of growing Staphylococcus aureus
H U Koch et al. Eur J Biochem. 1984.
Free article
Abstract
Pulse-chase experiments with [2-3H]glycerol and [14C]acetate revealed that in Staphylococcus aureus lipoteichoic acid biosynthesis plays a dominant role in membrane lipid metabolism. In the chase, 90% of the glycerophosphate moiety of phosphatidylglycerol was incorporated into the polymer: 25 phosphatidylglycerol + diglucosyldiacylglycerol leads to (glycerophospho)25-diglucosyldiacylglycerol + 25 diacylglycerol. Glycerophosphodiglucosyldiacylglycerol was shown to be an intermediate, confirming that the hydrophilic chain is polymerized on the final lipid anchor. Total phosphatidylglycerol served as the precursor pool and was estimated to turn over more than twice for lipoteichoic acid synthesis in one bacterial doubling. Of the resulting diacylglycerol approximately 10% was used for the synthesis of glycolipids and the lipid anchor of lipoteichoic acid. The majority of diacylglycerol recycled via phosphatidic acid to phosphatidylglycerol. Synthesis of bisphosphatidylglycerol was negligible and only a minor fraction of phosphatidylglycerol passed through the metabolically labile lysyl derivative. In contrast to normal growth, energy deprivation caused an immediate switch-over from the synthesis of lipoteichoic acid to the synthesis of bisphosphatidylglycerol.
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