Single‐Molecule Imaging of Active Mitochondrial Nitroreductases Using a Photo‐Crosslinking Fluorescent Sensor
作者:Zacharias Thiel、Pablo Rivera‐Fuentes
DOI:10.1002/anie.201904700
日期:2019.8.12
is activated sequentially by nitroreductases and light to give a photo‐crosslinked adduct of active enzymes. In combination with a general photoactivatable marker of mitochondria, we performed two‐color, three‐dimensional, single‐molecule localization microscopy. These experiments allowed us to image the sub‐mitochondrial organization of microdomains of nitroreductase activity.
已知许多生物大分子聚集在具有特定亚细胞定位的微区中。就酶而言,这种聚类极大地定义了其生物学功能。硝基还原酶是能够将硝基还原为胺的酶,并在排毒和前药活化中起作用。尽管已在哺乳动物细胞中检测到硝基还原酶活性,但该活性的亚细胞定位仍未完全表征。在这里,我们报告了一种荧光探针,该探针能够对线粒体内的硝基还原酶活性池进行超分辨成像。该探针被硝基还原酶和光依次激活,形成活性酶的光交联加合物。结合线粒体的一般光激活标记物,我们进行了两色,三维,单分子定位显微镜。这些实验使我们能够对硝基还原酶活性微区的线粒体下组织进行成像。