Novel fucolipids of human adenocarcinoma: monoclonal antibody specific for trifucosyl Ley (III3FucV3FucVI2FucnLc6) and a possible three-dimensional epitope structure.

Immunization of mice with Ley-active trifucosylnonaosylceramide (III3FucV3FucVI2FucnLc6) isolated from human colonic adenocarcinoma (Nudelman, E., Levery, S. B., Kaizu, T., and Hakomori, S. (1986) J. Biol. Chem. 261, 11247-11253) followed by selection of hybridoma by positive reaction with this antigen and negative reaction with two other Ley antigens (III3FucIV2FucnLc4 and V3FucVI2FucnLc6) resulted in successful isolation of the hybridoma producing IgM antibody, termed KH1, specific to Ley-active trifucosylnonaosylceramide, which does not cross-react with Ley-active hexaosyl- or octaosylceramides (III3FucIV2FucnLc4 and V3FucVI2FucnLc6) without internal fucosyl substitution. The three-dimensional structure of the trifucosylnonaosylceramide was simulated based on previously published glycosidic torsion angles for fucosyl type 2 chain (Lex and Ley) and for GlcNAc beta 1----3Gal beta as predicted by hard sphere exo-anomeric calculations (Thøgersen, H., Lemieux, R. U., Bock, K., and Meyer, B. (1982) Can. J. Chem. 60, 44-57). The picture thus constructed showed a broad nonpolar area consisting of the hydrophobic surface of the pyranosyl ring and acetamido group of N-acetylglucosamine and three CH3 groups of L-fucose; this hydrophobic area is adjacent to a hydrophilic area. In analogy to the detailed structure of Leb or Ley involved in their interactions with antibodies and lectins (Spohr, U., Hindsgaul, O., and Lemieux, R. U. (1985) Can. J. Chem. 63, 2644-2652), such a wide hydrophobic area adjacent to a hydrophilic region could be recognized by the antibody KH1, as shown in the model illustrated in the text. Since the axis of ceramide, which is inserted in the lipid bilayer, is perpendicular to the plane of type 2 chain, the epitope recognized by the antibody KH1 is located at the external nonpolar surface of the carbohydrate chain that is overlaid on the lipid bilayer.

• Publication year

  1986

• Venue

  Journal of Biological Chemistry

• Publication date

  1986-08-25

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(18)67376-4PMID 2426269
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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