Z-LETD-aminoluciferin

Molecular weight: 871.93. Extinction coefficient (cm^-1 M^-1): 18000. Excitation (nm): 362. Emission (nm): 499. Z-LETD-aminoluciferin is a luminogenic substrate that measures caspase-8 activity in apoptotic cells. Caspases, a family of aspartate-specific cysteine proteases, are key regulators of apoptosis, orchestrating the initiation and execution of cellular disassembly through the cleavage of specific cellular proteins. The tetrapeptide sequence LETD in this substrate is specific for protease cleavage by caspase-8. Following caspase-8 activation, the LETD peptide is cleaved just after the aspartic acid residue (D), releasing aminoluciferin, a luminescent substrate for the luciferase reaction. The intensity of the bioluminescent signal is directly proportional to the amount of caspase-8 activity in the sample, making it a valuable tool for researchers to study and quantify apoptotic processes, screen potential drug candidates, and investigate various cellular pathways related to cell death and survival.