SensoLyte® 520 Cathepsin L Assay Kit Fluorimetric - 1 kit

FRET; Protease activity

Cathepsin, Cathepsin L

NS0

Store component C at -80°C. Store all other components at -20°C. Component D can be stored at room temperature for convenience. Protect components A and B from light and moisture.

Cathepsins are a class of globular lysosomal proteases, playing a vital role in mammalian cellular turnover. They degrade polypeptides and are distinguished by their substrate specificities. Cathepsin L, a lysosomal endopeptidase, is a member of the papain-like family of cysteine proteinases. It is involved in the promotion of tumor cell invasion, antigen processing and turnover of intracellular and secreted proteins.
The SensoLyte® 520 Cathepsin L Activity Assay Kit uses a QXL™ 520/HiLyte™ Fluor 488 labeled FRET peptide substrate for measuring enzyme activity. The long wavelength FRET substrate is designed based on a sequence surrounding the cleavage site of Cathepsin L. The QXL™ 520/HiLyte™ Fluor 488 pair is used for optimal quenching of the intact substrate. When active Cathepsin L cleaves the FRET substrate, it results in an increase of HiLyte Fluor™ 488 fluorescence and is monitored at excitation/emission = 490 nm/520 nm. The fluorescent signal from HiLyte™ Fluor 488 is stable at low pH, the optimal pH for Cathepsin L activity.

490

Fluorescent

Research use

5400535130336