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  • Title: Design, synthesis, and immunochemical characterization of a chimeric glycopeptide corresponding to the Shigella flexneri Y O-polysaccharide and its peptide mimic MDWNMHAA.
    Author: Hossany BR, Johnston BD, Wen X, Borrelli S, Yuan Y, Johnson MA, Pinto BM.
    Journal: Carbohydr Res; 2009 Aug 17; 344(12):1412-27. PubMed ID: 19467535.
    Abstract:
    Two glycopeptide chimeras corresponding to the Shigella flexneri Y O-polysaccharide and its peptide mimic were designed in an attempt to improve the binding affinity by increasing the entropy of binding relative to the original octapeptide mimic of the O-polysaccharide. The design was based on the X-ray crystal structures of a monoclonal antibody SYA/J6 in complex with its cognate ligands, a pentasaccharide corresponding to the S. flexneri Y O-polysaccharide and the octapeptide mimic, MDWNMHAA. Both chimeric molecules consist of a rhamnose trisaccharide linked through an alpha- or beta-thioglycosidic linkage to a MDW moiety in which the W unit has been modified. We predicted that omission of the NMHAA moiety would obviate the bound water molecules that provided complementarity with the antibody-combining site, and the conformational restriction resulting from imposition of an alpha-turn at the C-terminus of the peptide. The glycopeptides were then docked into the active site of SYA/J6 using the program autodock 3.0, and the structures were optimized. The best models obtained in each case showed that the chimeric molecules, with either an alpha- or beta-thioglycosidic linkage, might be reasonable surrogate ligands for the antibody. We report here the synthesis of the alpha-glycopeptide employing solution and solid-phase strategies. Immunochemical characterization indicated that the alpha-glycopeptide unfortunately did not inhibit binding of SYA/J6 to the S. flexneri Y lipopolysaccharide.
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