Immunoelectron microscopic study of the location of group-specific and protein type-specific antigens of group B streptococci.
The ultrastructural location of the group-specific polysaccharide and the type-specific protein antigens R and X of group B streptococci was studied by means of the direct immunoferritin technique. The group-specific antigen was located on the outer wall layer. The specificity of the reaction was proved by the inhibition of labelling after absorption of the antibody-ferritin conjugate with group B polysaccharide. On the other hand, the demonstration of the polysaccharide was not sterically hindered by protein type antigens. As with group A and C streptococci the group polysaccharide could be localized on both the outer and inner surfaces of isolated walls. The protein antigens R and X were also demonstrated on the wall surface. The specificity of the reaction was ensured by making use of the enzymic sensitivity of these antigens. The location of the R protein on long filaments protruding from the cell surface resembles that of M protein of group A streptococci. In contrast to the group polysaccharide both the R and X protein antigens are localized only on the outer surface of isolated walls.
D000942:Antigens, Bacterial; D002473:Cell Wall / Q000276:immunology; D000939:Epitopes; D008854:Microscopy, Electron; D011135:Polysaccharides, Bacterial / Q000276:immunology; D013292:Streptococcus agalactiae / Q000276:immunology* / Q000648:ultrastructure
D000942:Antigens, Bacterial; D000939:Epitopes; D011135:Polysaccharides, Bacterial