The cellular tracking, detection and sensing of protein or antibody movement are important aspects to advance our understanding of biomolecular interactions and activity. Antibodies modified with fluorescent dyes are also valuable tools, especially in immunology research. We describe here a proof-of-principle study of a new water-soluble coumarin probe with a maleimide thiol-reacting unit to fluorescently tag biomolecules. Highlights include: (1) a convenient water-based preparation of N-substituted maleimides, (2) a one-pot preparation of activated maleimido-esters, and (3) a bio-conjugation protocol for the selenol-promoted reduction of native disulfide bonds and the ‘site-specific’ labelling of antibodies with no significant loss of activity.
                                    细胞对蛋白质或
抗体运动的追踪、检测和感知是增进我们对
生物分子相互作用和活性理解的重要方面。用荧光
染料修饰的
抗体也是有价值的工具,特别是在免疫学研究中。这里我们描述了一项原理验证研究,涉及一种新的
水溶性
香豆素探针,该探针具有马来
酰亚胺巯基反应单元,用于荧光标记
生物分子。重点包括:(1)N-取代马来
酰亚胺的便捷
水基制备,(2)活化马来
酰亚胺酯的一锅法制备,以及(3)
硒醇促进的本征二
硫键还原和无显著活性损失的
抗体“位点特异性”标记的
生物偶联方案。