Synthesis of thioether-linked analogues of the 2,3-sialyl-TF and MECA-79 antigens: mucin-type glycopeptides associated with cancer and inflammation.
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Antigens, Surface↗
Biomedical subjects
Lisa A Marcaurelle
Publications and source records attributed to Lisa A Marcaurelle.
Linear synthesis of the tumor-associated carbohydrate antigens Globo-H, SSEA-3, and Gb3.
The tumor-associated carbohydrate antigens Globo-H, SSEA-3, and Gb3 were synthesized in a linear fashion using glycosyl phosphate monosaccharide building blocks. All of the building blocks were prepared from readily available common precursors. The difficult alpha-(1-->4-cis)-galactosidic linkage was installed using a galactosyl phosphate donor with high selectivity. Introduction of the beta-galactosamine unit required the screening a variety of amine protecting groups to ensure good donor reactivity and protecting group compatibility. An N-trichloroacetyl-protected galactosamine donor performed best for the installation of the beta-glycosidic linkage. Conversion of the trichloroacetyl group to the N-acetyl group was achieved under mild conditions, fully compatible with the presence of multiple glycosidic bonds. This synthetic strategy is expected to be amenable to the synthesis of the globo-series of tumor antigens on solid-support.
Antigens, Neoplasm↗
Combinatorial carbohydrate chemistry.
The application of combinatorial chemistry to the synthesis of carbohydrate-based compound collections has received increased attention in recent years. New strategies for the solution-phase synthesis of oligosaccharide libraries have been reported, and the use of monosaccharides as scaffolds in the generation of combinatorial libraries has been described. Novel approaches to the assembly of carbohydrate-based antibiotics, such as aminoglycoside analogs and vancomycin derivatives, have also been disclosed.
Carbohydrates↗
Recent advances in the chemical synthesis of mucin-like glycoproteins.
This purpose of this mini review is to familiarizereaders with the tools currently available for the synthesis of mucin-typeglycoproteins. The article will highlight recent approaches to thesynthesis of glycopeptide fragments bearing complex O-linkedglycans, as well as new strategies for the generation of full-lengthglycoproteins.
Amino Acid Sequence↗
Homogeneous glycopeptides and glycoproteins for biological investigation.
Protein glycosylation is widely recognized as a modulator of protein structure, localization, and cell-cell recognition in multicellular systems. Glycoproteins are typically expressed as mixtures of glycoforms, their oligosaccharides being generated by a template-independent biosynthetic process. Investigation of their function has been greatly assisted by sources of homogeneous material. This review summarizes current efforts to obtain homogeneous glycopeptide and glycoprotein materials by a variety of methods that draw from the techniques of recombinant expression, chemical synthesis, enzymatic transformation, and chemoselective ligation. Some of these techniques remove obstacles to glycoprotein synthesis by installing nonnative linkages and other modifications for facilitated assembly. The end purpose of the described approaches is the production of glycosylated materials for experiments relevant to the biological investigation of glycoproteins, although the strategies presented apply to other posttranslational modifications as well.
Amino Acid Sequence↗