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We investigated the lipid composition of vegetative cells of Stigmatella aurantiaca. Four phospholipids were isolated and identified: phosphatidylethanolamine as the main component, phosphatidylglycerol, lysophosphatidylethanolamine in an exceptionally large amount (17%), and phosphatidylinositol (18 to 25%), rare in procaryotic cells. This composition did not change significantly during growth. The fatty acids of total lipids were found to be rather similar to those of other strains of myxobacteria; the main fatty acids found were unsaturated and branched. We noted a different fatty acid pattern for each phospholipid. The presence of unusual alkyl ether linkages, established by chemical hydrolysis and infrared spectroscopy, was unexpected in these bacteria. Diacyl ester, dialkyl ether, and monoacyl-monoalkyl structures were shown in phosphatidylethanolamine and phosphatidylglycerol. Lysophosphatidylethanolamine was essentially a monoacyl form, whereas phosphatidylinositol was a unique dialkyl ether phospholipid.

Occurrence of dialkyl ether phospholipids in Stigmatella aurantiaca DW4