What is the difference between caspase-3 and cleaved caspase-3?
One specific effector caspase is caspase-3, a protein that is cleaved and thus activated upon the initiation of apoptosis. Cleaved caspase-3 propagates an apoptotic signal through enzymatic activity on downstream targets, including poly ADP ribose polymerase (PARP) and other substrates (2).
What is the role of caspase-3 in apoptosis?
Caspase-3 is known as an executioner caspase in apoptosis because of its role in coordinating the destruction of cellular structures such as DNA fragmentation or degradation of cytoskeletal proteins (1).
Is caspase-3 Required for apoptosis?
Among them, caspase-3 is a frequently activated death protease, catalyzing the specific cleavage of many key cellular proteins. Caspase-3 is also required for some typical hallmarks of apoptosis, and is indispensable for apoptotic chromatin condensation and DNA fragmentation in all cell types examined.
How is caspase-3 measured?
The Caspase-3 assay protocol is based on the formation of the chromophore p-nitroaniline (p-NA) by cleavage from the labeled substrate DEVD-pNA. The p-NA can be quantified using a spectrophotometer or a microtiter plate reader reading absorbance at 400 or 405 nm.
What is activated caspase 3?
Caspase-3 is a cysteine–aspartic acid protease that cleaves cellular targets and executes cell death. Our current understanding is caspase-3 is activated by the cleavage of the interdomain linker and then subsequent cleavage of the N-terminal prodomain.
What is a limitation of the caspase 3 assay?
Additionally, the main limitations for our multiplexing protocol are that caspase-3/7 activity can determined but not quantified, and the resulting lysate cannot be used for downstream assays (i.e. Western blots or gene expression).
Where does caspase-3 activation occur?
apoptotic cell
Activation. Caspase-3 is activated in the apoptotic cell both by extrinsic (death ligand) and intrinsic (mitochondrial) pathways. The zymogen feature of caspase-3 is necessary because if unregulated, caspase activity would kill cells indiscriminately.
Where does caspase 3 activation occur?
What do caspases digest?
Most forms of apoptosis involve caspases, the proteases that are activated by apoptotic signals to digest cellular proteins and induce death. Caspases are cysteine-dependent proteases that recognize specific amino acid motifs containing aspartic acid residues in their target proteins.
What is caspase assay?
The caspase activity assay is designed for use with multiwell plate formats using either purified enzyme or cells in culture and can be multiplexed with other cell-based assays. The assay delivers excellent Z´-factor values in cell and purified enzyme models.