| Résumé | Spirochaeta aurantia is a free-living saprophytic spirochete that grows easily in simple laboratory media, and thus can be used as a model for the investigation of surface carbohydrate structures in spirochetae, which are normally not available in sufficient amounts. Freeze-substitution electron microscopy indicated the presence of a capsule-like material projecting from the surface of S. aurantia. Extraction of cells gave two major glycolipids, the one with a higher molecular mass glycolipid was designated large glycolipid A (LGLA). LGLA contained small amount of branched and unsaturated O-linked fatty acids, l-rhamnose, l-fucose, d-xylose, d-mannose, d-glucosamine, d-glycero-d-gluco-heptose (DDglcHep), d-glycero-d-manno-heptose (DDHep), and a novel branched tetradeoxydecose monosaccharide, which we proposed to call aurantose (Aur). |
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