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CD2 is a cell surface protein belonging to the immunoglobulin superfamily (IgSF) that plays a key role in mediating adhesion between human T-lymphocytes and target cells. The interaction between cell-adhesion molecules CD2 and CD58 is critical for immune response. Modulation or inhibition of these interactions has been shown to be therapeutically useful. Synthetic 12-mer linear and cyclic peptides and cyclic hexapeptides from the beta-turn and beta-strand region (hot spot) of human CD2 protein were designed to modulate CD2-CD58 interaction. The 12-amino acid synthetic cyclic peptides effectively blocked the interaction between CD2 and CD58 proteins as demonstrated by E-rosetting and heterotypic adhesion assays. NMR and molecular modeling studies indicated that these cyclic peptides exhibit beta-turn structure in solution and closely mimic the beta-turn structure of the surface epitopes of CD2 protein. The designed cyclic peptides with beta-turn structure have the ability to modulate CD2-CD58 interaction.

Structure−Activity Studies of Peptides from the “Hot-Spot” Region of Human CD2 Protein: Development of Peptides for Immunomodulation