Based on structural information reported for the tumour-associated epithelial mucin MUC1, glycopeptides have been synthesized which contain tumour-associated saccharide antigens. such as the Thomsen-Friedenreich (T), TN or sialyl TN antigen. in combination with peptide sequences of the tandem repeat region of MUC1. Solid-phase syntheses have been carried out using N-Fmoc protected O-glycosyl serine and threonine building blocks and an allylic anchor which is stable to basic and acidic conditions, but can be cleaved under neutral conditions in a palladium(0)-catalysed allyl transfer reaction. In addition. a (2-3)sialyl T antigen threonine building block was prepared by a chemoenzymatic strategy and used in the synthesis of an N-terminal glycopeptide antigen of leukosialin (CD43). The proliferation of cytotoxic T cells could be induced using a construct consisting of a MUC1-glycopeptide antigen and a T cell epitope.
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