Immunochemical Studies on Bacterial Blood Group Substances:VI. Structures of A-Active Oligosaccharides Isolated from Salmonella riogrande Lipopolysaccharide

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A-decomposing enzyme prepaiation (α-N-acetylgalactosaminidase) from hog liver, liberates from the lipopolysaceharide of Salmonella riogrande, which contains O antigen 40, 15.5% of its original amount of N-aeetylgalatosamine, destroying its ability of inhibiting the agglutination of human A red cells by anti-S. riogrande rabbit serum. From the structures of blood group A-active oligosaccharides, obtained from the lipopolysaccharide by mild acid-hydrolsis, it was assumed that the antigenic determinant of A specilieity might have the following strueture, which indicated the presence of N-acetylgalactosaminlyl residue as the non-reducing end; α-N-acetylgalactosaminyl-(1→3)-mannosyl-glucosyl-(1→3)-N-acetylgalactosaminyl-glucose.
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