The design and synthesis of an α-Gal trisaccharide epitope that provides a highly specific anti-Gal immune response
作者:Kensaku Anraku、Shun Sato、Nicholas T. Jacob、Lisa M. Eubanks、Beverly A. Ellis、Kim D. Janda
DOI:10.1039/c7ob00448f
日期:——
moiety were examined for their ability to elicit immune responses in KO mice. Both target epitopes were synthesized using a two-component enzymatic system using modified disaccharide substrates containing a linker moiety for coupling. While both glycoconjugate vaccines induced the required high anti-Gal IgG antibody titers, it was found that this response had exquisite specificity for the Galα(1,3)Galβ(1
展示Galα(1,3)Gal表位的碳水化合物抗原可被人类天然存在的抗体识别。这些抗-Gal抗体最多占血清IgG的1%,并被认为是有害的,因为它们会导致超急性器官排斥。为了模拟这种情况,将α(1,3)半乳糖基转移酶敲除小鼠接种Galα(1,3)Gal表位。在我们的研究中,检查了由方酸酯部分连接的由Galα(1,3)Galβ(1,4)GlcNAc或Galα(1,3)Galβ(1,4)Glc组成的两个α-Gal三糖表位是否存在。它们在KO小鼠中引发免疫反应的能力。使用两组分酶促系统合成两个靶标表位,所述酶联体系使用含有用于偶联的接头部分的修饰的二糖底物。尽管两种糖缀合物疫苗均能诱导所需的高抗Gal IgG抗体滴度,但发现该反应对所用的Galα(1,3)Galβ(1,4)GlcNAc半抗原具有极高的特异性,而与Galα( 1,3)Galβ(1,4)Glc半抗原。我们的发现表明,尽管同质的糖缀合物疫