α-Galactose based neoglycopeptides. Inhibition of verotoxin binding to globotriosylceramide
摘要:
Solution and solid phase strategies for the synthesis of a-galactose based neoglycopeptide derivatives 2-13 were developed. Neoglycopeptides generated were tested for the inhibition of verotoxin binding to globotriosylceramide (Gb3) using ELISA. Among all of the compounds tested, only the lipid derivatives of neoglycopeptides, 11, 12 and 13 were found to be inhibitors, IC50 = 2.0 mM (11b and 12c) and 0.2 mM (11c and 13c). All of the inhibitors (11b, 11c, 12c and 13c) have a similar branching of the two alpha-galactosyl units at the N-terminal glycine residue of a short peptide and a lipid moiety attached at the C-terminal site. Both of these factors seem to be crucial for the inhibition. It is interesting to note that the inhibitors have only a portion of the natural trisaccharide ligand. The secondary groups either may contribute in sub-site oriented interactions with the protein receptors or may mimic the internal sugar units of the cell-surface ligand, Gb3. (C) 1999 Elsevier Science Ltd. All rights reserved.
α-Galactose based neoglycopeptides. Inhibition of verotoxin binding to globotriosylceramide
作者:Prabhat Arya、Kristina M.K. Kutterer、Huiping Qin、Johanne Roby、Michael L. Barnes、Shuqiong Lin、Clifford A. Lingwood、Markus G. Peter
DOI:10.1016/s0968-0896(99)00226-6
日期:1999.12
Solution and solid phase strategies for the synthesis of a-galactose based neoglycopeptide derivatives 2-13 were developed. Neoglycopeptides generated were tested for the inhibition of verotoxin binding to globotriosylceramide (Gb3) using ELISA. Among all of the compounds tested, only the lipid derivatives of neoglycopeptides, 11, 12 and 13 were found to be inhibitors, IC50 = 2.0 mM (11b and 12c) and 0.2 mM (11c and 13c). All of the inhibitors (11b, 11c, 12c and 13c) have a similar branching of the two alpha-galactosyl units at the N-terminal glycine residue of a short peptide and a lipid moiety attached at the C-terminal site. Both of these factors seem to be crucial for the inhibition. It is interesting to note that the inhibitors have only a portion of the natural trisaccharide ligand. The secondary groups either may contribute in sub-site oriented interactions with the protein receptors or may mimic the internal sugar units of the cell-surface ligand, Gb3. (C) 1999 Elsevier Science Ltd. All rights reserved.
Troubleshooting When Using γ-Valerolactone (GVL) in Green Solid-Phase Peptide Synthesis
作者:Ashish Kumar、Adeniyi Thompson-Adewumi、K. P. Nandhini、Jonathan M. Collins、Fernando Albericio、Beatriz G. de la Torre
DOI:10.1021/acs.oprd.9b00073
日期:2019.5.17
solid-phase peptidesynthesis. In a previous study, our group proposed γ-valerolactone (GVL) as a replacement for the hazardous DMF. However, during Fmoc removal of the less hindered Gly residue, acylation with GVL can take place. Here we demonstrate that this side reaction can be circumvented by the incorporation of the corresponding dipeptides that carry Gly as the C-terminal. These dipeptides were conveniently