Surendranath Kalpana, Karande Anjali A
Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
Clin Vaccine Immunol. 2008 May;15(5):737-43. doi: 10.1128/CVI.00254-07. Epub 2008 Mar 19.
Plant ribosome-inactivating proteins (RIPs) are RNA N-glycosidases that inhibit protein synthesis in cells. Abrin, a type II RIP, is an AB type toxin, which is one of the most lethal types of toxin known. The B chain facilitates the entry of the molecule into the cell, whereas the A chain exerts the toxic effect. We have generated hybridomas secreting antibodies of the immunoglobulin G class specific to the recombinant A chain of abrin. One monoclonal antibody, namely, D6F10, rescued cells from abrin toxicity. Importantly, the antibody also protected mice from lethal doses of the toxin. The neutralizing effect of the antibody was shown to be due to interference with abrin attachment to the cell surface.
植物核糖体失活蛋白(RIPs)是一类RNA N-糖苷酶,可抑制细胞内的蛋白质合成。相思子毒素是一种II型RIP,属于AB型毒素,是已知毒性最强的毒素之一。B链促进该分子进入细胞,而A链发挥毒性作用。我们已制备出分泌针对重组相思子毒素A链的免疫球蛋白G类抗体的杂交瘤。一种单克隆抗体,即D6F10,可使细胞免受相思子毒素的毒性作用。重要的是,该抗体还能保护小鼠免受致死剂量毒素的侵害。抗体的中和作用被证明是由于干扰了相思子毒素与细胞表面的结合。