The invention relates to novel methods of preparing cell-binding agent-cytotoxic agent conjugates, wherein the cytotoxic agent is an imine-containing cytotoxic agent bearing a maleimide group. In some embodiments, the cell-binding agent (CBA) is covalently linked to the cytotoxic agent through an engineered Cys, such as an engineered Cys in the heavy chain CH3 domain, at a position corresponds to the EU/OU numbering position 442 (or C442) on an antibody CBA. The invention also provides conjugates prepared by the methods of the present invention, compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the conjugates of the invention.
本发明涉及一种新的制备细胞结合剂-细胞毒剂结合物的方法,其中细胞毒剂是一种含有马来
酰亚胺基团的亚
胺类细胞毒剂。在某些实施例中,细胞结合剂(CBA)通过工程半胱
氨酸与细胞毒剂共价连接,例如在
抗体CBA上与EU/OU编号位置442(或C442)对应的重链
CH3区域中的工程半胱
氨酸处。本发明还提供了通过本发明方法制备的结合物,以及使用本发明的结合物抑制异常细胞生长或治疗哺乳动物增殖性疾病的组合物和方法。