DQ-BSA-RED

DQ-BSA-Red is a bovine serum albumin labeled with a red fluorescent dye that can be used to detect lysosomal activity. The excitation wavelength and emission wavelength of DQ-BSA-Red are 590 nm and 620 nm, respectively. The BSA molecule in DQ-BSA-Red is labeled with high concentration of red fluorescent dye in multiple sites, which shows high fluorescence self-inhibition. Once DQ-BSA-RED enters the lysosome, DQ-BSA is cleaved by lysosomal proteases, resulting in unquenched and released fluorescent fragments, emitting bright fluorescence. Inactivated lysosomes are unable to degrade the BSA protein and thus have a lower or even no fluorescent signal^[1].

References:
[1]. Marwaha R, et al. DQ-Red BSA Trafficking Assay in Cultured Cells to Assess Cargo Delivery to Lysosomes. Bio Protoc. 2017 Oct 5;7(19):e2571.

DQ-BSA-Red 是一种用红色荧光染料标记的牛血清白蛋白，可用于检测溶酶体的活性情况。DQ-BSA-Red 的激发波长和发射波长分别为 590 nm 和 620 nm。DQ-BSA-Red 中的 BSA 分子内用红色荧光染料进行多位点高浓度标记，存在高度的荧光自抑制现象。DQ-BSA-Red 一旦进入溶酶体，DQ-BSA 就会被溶酶体蛋白酶裂解，导致荧光片段的不淬灭和释放，发出明亮的荧光。功能失活的溶酶体则无法降解 BSA 蛋白，从而具有更低或者甚至没有荧光信号。