Abstract
To investigate the effect of polysaccharide attachment to proteins on the production of IgG and IgE, the genetic attachment of polysaccharide to lysozymes (G49N and R21T) using the yeast expression system (Saccharomyces cerevisiae AH 22) and the Maillard-type polysaccharide attachment to native lysozyme and soybean P34 protein were attempted. The production of IgG and IgE was investigated by using mice immunized with the protein-polysaccharide conjugates or native proteins. The attachment of polysaccharide to lysozyme using the yeast expression system greatly suppressed the production level of IgG and IgE. The attachment of polysaccharide to native lysozyme and soybean P34 protein using the Maillard-type reaction was also found to be effective in reducing the production level of IgE compared to IgG.
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