Abstract
Caspases are the terminal proteases involved in apoptosis, as well as being involved in inflammation. The apoptotic caspases can be classified as either initiator or effector caspases based on both their position in the caspase cascade and their activation mechanism. Initiator caspases require dimerization to be activated, and cleavage of a loop called the intersubunit linker stabilizes the active enzyme. Effector caspases, on the other hand, are found as dimers in the cell and cleavage of the intersubunit linker is the key step in their activation.
The name caspase is short for cysteinyl aspartate-specific protease. As their name suggests, these enzymes hydrolyze peptide bonds after certain aspartate residues using a catalytic cysteine (with the aid of an active-site histidine residue). Caspases can be inhibited by endogenous inhibitors such as XIAP, by synthetic inhibitors which target either the active site or an allosteric site, or by post-translational modification. Further research is needed to find novel activators and inhibitors of caspases to treat diseases which involve misregulation of apoptosis.
Funding: This work was supported by a grant from the NIH (National Institutes of Health) [grant number GM065970 (to A.C.C.)].
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- ASC:
-
Apoptosis-associated speck-like protein containing a CARD
- CARD:
-
Caspase activation and recruitment domain
- Caspase:
-
Cysteinal aspartate-specific protease
- DAMPs:
-
Danger-associated molecular patterns
- DD:
-
Death domain
- DISC:
-
Death inducing signaling complex
- FADD:
-
Fas-associated death domain
- FasL:
-
Fas ligand
- FLICE:
-
FADD-like interleukin 1β-converting enzyme
- FLIP:
-
FLICE-like inhibitory protein
- FLIPL :
-
Long splice variant of FLIP which forms a heterodimer with caspase-8
- FLIPS :
-
Short splice variant of FLIP which blocks caspase-8 from binding death receptor
- ICE:
-
Interleukin 1β-converting enzyme
- IL-1β:
-
Interleukin 1β
- IL-18:
-
Interleukin 18
- PS:
-
Phosphatidylserine
- Smac:
-
Second mitochondrial activator of caspases
- TNFR:
-
Tumor necrosis factor receptor
- XIAP:
-
X-linked inhibitor of apoptosis protein
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Cade, C.E., Clark, A.C. (2015). Caspases – Key Players in Apoptosis. In: Bose, K. (eds) Proteases in Apoptosis: Pathways, Protocols and Translational Advances. Springer, Cham. https://doi.org/10.1007/978-3-319-19497-4_2
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