title: Association of elevated levels of cellular lipoteichoic acids of group B streptococci with human neonatal disease.
abstract: Cell-associated lipoteichoic acids (LTAs) from late-exponential-phase cultures (serotypes Ia, Ib, Ic, II, and III) of group B streptococci isolated from infected and asymptomatically colonized infants were quantitated and characterized by growing the organisms in a chemically defined medium containing [3H]glycerol and [14C]acetate. Cell pellets were extracted with 45% aqueous phenol and chloroform-methanol and subjected to DEAE-Sephacel anion-exchange chromatography. Elution profiles resolved three major peaks, I, II, and III, with glycerol and phosphate present in a 1:1 molar ratio in each peak, and results obtained by Ouchterlony immunodiffusion analysis confirmed the presence of poly(glycerol phosphate). Saponification indicated that [14C]acetate was incorporated into fatty acids of peaks I and II only, suggesting that these were cell-associated LTAs. Peak II was of small molecular weight (less than 10,000) and probably represented another species of LTA. Peaks I and II were further demonstrated to be LTA by their ability to sensitize human type O erythrocytes. Peak III lacked fatty acids and was shown to probably be deacylated LTA. Quantitation of cell-associated teichoic acid material produced by the group B streptococcal strains indicated that the clinical isolates from infants with early- or late-onset disease possessed significantly higher levels than did the asymptomatic (clinical isolates from infants without symptoms of disease) group B streptococcal strains.
mesh_terms: D002473:Cell Wall / Q000032:analysis; D004912:Erythrocytes / Q000187:drug effects; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000382:microbiology*; D008070:Lipopolysaccharides; D010712:Phosphatidic Acids / Q000032:analysis*; D012703:Serotyping; D013290:Streptococcal Infections / Q000382:microbiology*; D013292:Streptococcus agalactiae / Q000032:analysis* / Q000254:growth & development / Q000302:isolation & purification; D013682:Teichoic Acids / Q000032:analysis*
chemical_list: D008070:Lipopolysaccharides; D010712:Phosphatidic Acids; D013682:Teichoic Acids; C009900:lipoteichoic acid