title: Separation of two lipopolysaccharide populations with different contents of O-antigen factor 122 in Salmonella enterica serovar typhimurium.
abstract: Lipopolysaccharide (LPS) extraction from smooth-type Salmonella enterica sv. Typhimurium was carried out with the modified phenol/chloroform/petroleum ether method (volume ratio 5:5:8). In this procedure, LPS was precipitated from 90% phenol sequentially with water and acetone to yield LPS-H2O (minute amounts) and LPS-Ac (major amounts), respectively. Chemical analyses of the LPS fractions revealed that in the O antigen of LPS-H2O position C4 of the D-galactose was extensively glucosylated, corresponding corresponding to the O-antigen factor 122. In LPS-Ac, this glucosylation was negligible. Inspection of the LPS fractions by sodium dodecyl sulphate/polyacrylamide gel electrophoresis and silver staining suggested that the glucosylation in LPS-H2O was present only in LPS species with a chain length higher than six repeating units.
mesh_terms: D002240:Carbohydrate Sequence; D005591:Chemical Fractionation; D004591:Electrophoresis, Polyacrylamide Gel; D006031:Glycosylation; D008070:Lipopolysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D008745:Methylation; D008969:Molecular Sequence Data; D019081:O Antigens; D011135:Polysaccharides, Bacterial / Q000032:analysis*; D012486:Salmonella typhimurium / Q000737:chemistry* / Q000276:immunology; D016622:Silver Staining
chemical_list: D008070:Lipopolysaccharides; D019081:O Antigens; D011135:Polysaccharides, Bacterial