position. Generally, CRL was able to catalyze regioselective deprotection of acetylated monosaccharides in C6 position. When acetylated disaccharides were used as substrates, AXE exhibited a marked preference for the C2, or C6 position when C2 was involved in the glycosidic bond. By selecting the best enzyme for each substrate in terms of activity and regioselectivity, we prepared a small library of differently
several TB-infected patients, in order to evaluate the affinity of the glycoconjugate products for the human LAM-antibodies. The evaluation results are positive, especially compound 21 that exhibited excellent activity which could be considered as a lead compound for the future development of a new glycoconjugatedvaccineagainst TB.
Glycosylation of Recombinant Antigenic Proteins from Mycobacterium tuberculosis: In Silico Prediction of Protein Epitopes and Ex Vivo Biological Evaluation of New Semi-Synthetic Glycoconjugates
of conjugated antigens, obtained by combining antigenic oligosaccharides, such as the lipoarabinomannane (LAM), with antigenic proteins from Mycobacterium tuberculosis (MTB), has been proposed as a new strategy for developing efficient vaccines. In this work, we investigated the effect of the chemical glycosylation on two recombinant MTB proteins produced in E. coli with an additional seven-amino acid
结核病仍然是世界范围内最致命的传染病之一,结合抗原寡糖,如脂阿拉伯甘露聚糖 (LAM) 与来自结核分枝杆菌 (MTB) 的抗原蛋白,已提出使用结合抗原作为一种新策略用于开发高效疫苗。在这项工作中,我们研究了化学糖基化对大肠杆菌中产生的两种重组MTB 蛋白的影响,该蛋白具有额外的 7 个氨基酸标签(重组 Ag85B 和 TB10.4)。从甘露糖和两种二糖类似物开始,制备了不同的半合成糖缀合物衍生物。聚糖在异头位置被硫氰基甲基激活,这是通过与赖氨酸选择性反应进行蛋白质糖基化所必需的。研究了不同新糖蛋白的糖基化位点和免疫原活性的离体评价。糖基化不会改变 TB10.4 蛋白的免疫活性。类似地,Ag85B 在糖基化后保持其 B 细胞活性,同时显示出 T 细胞反应的显着降低。结果与推定的 B 和 T 细胞表位相关,使用计算机系统的组合进行预测。在重组 TB10.4 中,独特的赖氨酸不包含在任何 T 细胞表位中。Ag85B
Cell-specific glycopeptide ligands
申请人:Merck & Co., Inc.
公开号:US04386026A1
公开(公告)日:1983-05-31
Cell-specific ligands comprising conjugates of saccharides and amino acids or peptides are synthesized from amino acids such as ornithine, lysine, peptides such as dilysine, diornithine or oligolysine and selected saccharides having reactive functional groups protected by appropriate blocking groups. Such glycopeptides are useful as tissue specific substances, which when coupled with bioactive materials through metabolizable or hydrolyzable linkages, deliver such bioactive materials to the selected site. In this manner, antiinflammatory drugs such as dexamethasone are linked through a metabolizable or hydrolyzable linkage and on administration to an animal suffering from inflammatory disease carries the drug to the site of inflammation for intracellular release. Other examples include the macrophage ligand N.sup.2 -N.sup.2, N.sup.6 -Bis-[3-(.alpha.-D-mannopyranosylthio)propionyl]-6-lysyl-N.sup.6 -[3-(.alpha.-D-mannopyranosylthio)propionyl]-L-lysine, 5, which when coupled to .beta.-glucocerebrosidase, can deliver the enzyme selectively to kupffer cells. This is useful in the enzyme replacement therapy of Gaucher's disease.