Key information: SALAD1 is a specific and high-affinity aptamer-ligand for aptamer Mango II (KDapp = 0.69 nM). Green fluorogenic dye displaying 3.5-fold brighter fluorescence than other Mango aptamer dyes such as TO1-biotin. Binds 7.5-fold more tightly to Mango II compared to TO dye. SALAD1 exhibits a binding preference to its target RNA (Mango II) over the other three Mango aptamers (7-, 20- and 16-fold tighter than Mango I, III and IV).
The improved brightness and tighter binding of SALAD1 to Mango aptamers allow detection and tracking of RNA with greater sensitivity and spatial resolution, facilitating studies of RNA localization, dynamics, and expression in live-cell and single-molecule imaging applications.
Used for: imaging RNA in live and fixed cells, even at low concentration.
Application: confocal cellular imaging.
Properties and Photophysical Data: excitation and emission maxima (λ) measured in Mango selection buffer are 511 nm and 540 nm, respectively; quantum yield QY = 0.722; extinction coefficient ε(complex) = 47,284 M-1cm-1; fluorescence enhancement FE = 1,500; fluorescence efficiency E = 2,170 nM-1; brightness = 34,139 M-1cm-1. SALAD1 is cell-permeable.
