4-Methylumbelliferyl-β-D-Glucopyranoside

4-Methylumbelliferyl-β-D-Glucopyranoside (CAS No.: 18997-57-4) is a coumarin glycoside widely employed as a fluorogenic substrate in biochemical and biomedical research, particularly for the quantitative assessment of β-glucosidase and β-glucocerebrosidase activities. Upon enzymatic hydrolysis, it releases the highly fluorescent moiety 4-methylumbelliferone, enabling sensitive detection with emission maxima in the 445–454 nm range and excitation wavelengths that vary with pH, thereby supporting flexible assay conditions across different biological systems. This compound is commonly utilized in studies of lysosomal function and glycosphingolipid metabolism, including investigations of enzyme deficiencies associated with disorders such as Gaucher disease, as well as in the characterization and screening of novel glycosidase enzymes. Functionally, it serves as a substrate rather than a direct modulator of signaling pathways, with its readout reflecting enzymatic activity levels that can typically be monitored in vitro within nanomolar to micromolar substrate concentrations depending on assay sensitivity and design. In drug discovery and translational research, it is frequently applied in cell-based assays, enzymatic kinetics studies, and high-throughput screening platforms to evaluate enzyme inhibitors or activators, with experimental concentrations and conditions tailored to specific model systems and research objectives.