Apoptosis, or programmed cell death, is a crucial process in maintaining cellular homeostasis and eliminating damaged or unwanted cells. Dysregulation of apoptosis pathways is associated with various diseases, including cancer, autoimmune disorders, and neurodegenerative diseases. Targeting key components of the apoptosis machinery provides a promising approach for therapeutic development, aiming to either promote or inhibit cell death depending on the disease context.
In the IAP Fluorescence Polarization (FP) assay, a free fluorescent molecule tumbles rapidly in solution, resulting in depolarized emission. Upon binding to the larger IAP target, molecular rotation slows and the emitted light becomes more polarized. This change in polarization provides a quantitative measure of binding interaction strength.
In the BCL-2 HTRF assay, BCL-2 proteins labeled with a His tag bind to corresponding fluorescently labeled peptide substrates. When this interaction occurs and a detection reagent such as streptavidin-Tb is added, a high HTRF signal is generated. Signal strength reflects the interaction between BCL-2 and its substrate, enabling quantification of binding affinity and inhibitor effects.
In the caspase Fluorescence Intensity (FI) assay, a short peptide substrate containing a specific recognition sequence for active caspases is labeled with a fluorescent tag. When the caspase enzyme cleaves the peptide at the recognition site, the fluorescent tag is released and fluorescence increases. Higher fluorescence values correlate with greater caspase activity.
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