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Electron micrographs of phenol-water-extracted lipopolysaccharide (LPS) ofRhodopseudomonas capsulata show filamentous and netlike aggregates. Treatment of the LPS with sodium deoxycholate resulted in a reversible splitting into subunits. The LPS represents a cell wall constituent with O-antigenic specificity. In passive hemagglutination tests, high titers were obtained when erythrocytes sensitized with untreated or heat-treated LPS were incubated with antisera obtained by immunization of rabbits with whole cells ofR. capsulata . The alkali-treated LPS was not active in this test. Mouse lethality tests have shown that the LPS ofR. capsulata is less toxic than LPS ofEscherichia coli . Also, the X-ray protection efficacy and the phagocytic activity stimulation of LPS fromR. capsulata in mice are small, as compared with LPS ofE. coli . Incubation of living bacteria in saline (37 C) resulted in a solubilization of an LPS-protein-lipid complex from the outer layer of the cell wall. The isolated complex contained the components which were found in the LPS. In addition, 20% amino acids and a large amount of palmitic and stearic acids, which are typical phospholipid components, were present.

Localization and Biological and Physicochemical Properties of the Cell Wall Lipopolysaccharide of Rhodopseudomonas capsulata