PubMed:16373330 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/16373330","sourcedb":"PubMed","sourceid":"16373330","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/16373330","text":"Immunoglobulin G specifically binding plant N-glycans with high affinity could be generated in rabbits but not in mice.\nXylosylated and core alpha1,3-fucosylated N-glycans from plants are immunogenic, and they play a still obscure role in allergy and in the field of plant-made protein pharmaceuticals. We immunized mice to generate monoclonal antibodies (mAbs) binding plant N-glycans specifically via the epitope containing either the xylose or the core alpha1,3-fucose residue. Splenocytes expressing N-glycan-specific antibodies derived from C57BL/6 mice previously immunized with plant glycoproteins were preselected by cell sorting to generate hybridoma lines producing specific antibodies. However, we obtained only mAbs unable to distinguish fucosylated from xylosylated N-glycans and reactive even with the pentasaccharide core Man3GlcNAc2. In contrast, immunization of rabbits yielded polyclonal sera selectively reactive with either fucosylated or xylosylated N-glycans. Purification of these sera using glyco-modified neoglycoproteins coupled to a chromatography matrix provided polyclonal sera suitable for affinity determination. Surface plasmon resonance measurements using sensor chips with immobilized glyco-modified transferrins revealed dissociation constants of around 10(-9) M. This unexpectedly high affinity of IgG antibodies toward carbohydrate epitopes has repercussions on our conception of the binding strength and significance of antiglycan IgE antibodies in 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