Synthesis of site-heterologous haptens for high-affinity anti-pyraclostrobin antibody generation
作者:Josep V. Mercader、Consuelo Agulló、Antonio Abad-Somovilla、Antonio Abad-Fuentes
DOI:10.1039/c0ob00686f
日期:——
The design and synthesis of functional chemical derivatives of small organic molecules is usually a key step for the intricate production of a variety of bioconjugates. In this respect, the derivatization site at which the spacer arm is introduced in immunizing conjugates constitutes a highly critical parameter for the generation of high-affinity and selective antibodies. However, due to the usual complexity of the required synthetic procedures, the appropriate comparison of alternative tethering positions has often been neglected. In the present study, meticulous strategies were followed to prepare synthetic derivatives of pyraclostrobin with the same linkers located at diverse rationally-chosen sites. Activity appraisal of antibodies and bioconjugates was carried out by bidimensional competitive direct and indirect immunoassays, and a superior performance of two of the three synthesized haptens was found. Finally, a detailed analysis of the conformations of the target molecule and the synthesized haptens in aqueous solution was done using computer assisted molecular modeling techniques. This study suggested that the lower titers and affinities of one set of antibodies are most probably due to conformational effects of the spacer arm in the immunizing bioconjugate.
设计和合成有机小分子的功能化学衍生物通常是复杂生产各种生物共轭物的关键步骤。在这方面,免疫共轭物中引入间隔臂的衍生位点是产生高亲和力和选择性抗体的一个非常关键的参数。然而,由于所需的合成程序通常比较复杂,人们往往忽视了对其他系链位置的适当比较。在本研究中,我们遵循缜密的策略制备了吡唑醚菌酯的合成衍生物,这些衍生物具有位于不同合理选择位点的相同连接体。通过二维竞争性直接和间接免疫测定法对抗体和生物共轭物进行了活性评价,结果发现三种合成物中的两种具有更优越的性能。最后,利用计算机辅助分子建模技术对水溶液中的目标分子和合成合剂的构象进行了详细分析。这项研究表明,一组抗体的滴度和亲和力较低,很可能是由于免疫生物共轭物中的间隔臂的构象效应造成的。