Cyclooxygenase-2 (COX-2) over-expression is prominent in inflammatory diseases, neurodegenerative disorders, and cancer. Directly monitoring COX-2 activity within its native environment poses an exciting approach to account for and illuminate the effect of the local environments on protein activity. Herein, we report the development of CoxFluor, the first activity-based sensing approach for monitoring COX-2 within live cells with confocal microscopy and flow cytometry. CoxFluor strategically links a natural substrate with a dye precursor to engage both the cyclooxygenase and peroxidase activities of COX-2. This catalyzes the release of resorufin and the natural product, as supported by molecular dynamics and ensemble docking. CoxFluor enabled the detection of oxygen-dependent changes in COX-2 activity that are independent of protein expression within live macrophage cells.
环氧合酶-2(COX-2)在炎症性疾病、神经退行性疾病和癌症中的过度表达是显著的。直接监测COX-2在其天然环境中的活性提供了一种令人兴奋的方法,可以解释和阐明局部环境对蛋白质活性的影响。在这里,我们报告了CoxFluor的开发,这是第一种用于监测活细胞内COX-2活性的基于活性的传感方法,使用共聚焦显微镜和流式细胞术。CoxFluor巧妙地将天然底物与
染料前体相连,以同时参与COX-2的环氧合酶和
过氧化物酶活性。这催化了鲁苏芬和
天然产物的释放,得到了分子动力学和集合对接的支持。CoxFluor使得能够检测到在活细胞内与
氧气有关的COX-2活性变化,这种变化与蛋白质表达无关,发生在活性巨噬细胞中。