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The apoptotic cysteine protease CPP32
1Hanson Centre for Cancer Research, Institute of Medical and Veterinary Science, Adelaide, Australia.
Abstract:
CPP32 (also called Yama and apopain) is a member of a growing family of cysteine proteases which includes the interleukin-1 beta-converting enzyme (ICE) and the product of the Caenorhabditis elegans cell death gene ced-3. CPP32 has been consistently implicated as a key protease of the ICE/CED-3 family that is activated in response to a variety of death stimuli. Active CPP32 consists of P17 and p12 subunits derived from a 32 kDa pro-enzyme. This activation can be mediated by some ICE-like proteases and the cytotoxic T-cell (CTL) protease granzyme B. Once activated, CPP32 can process some of the other ICE family members and cleaves several cellular proteins in apoptotic cells. Inhibitors of CPP32 and other ICE-like proteases are potent inhibitors of apoptosis and promise to be important therapeutic molecules for the treatment of diseases, such as neurodegenerative and autoimmune disorders, that arise from excessive ell death.
Insights
Caspase-3 (CPP32) is a key protease in apoptosis, activated by death signals. Inhibiting this protease may treat diseases involving excessive cell death.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Caspase-3 (CPP32), also known as Yama and apopain, is a cysteine protease.
- It belongs to the interleukin-1 beta-converting enzyme (ICE)/CED-3 family of proteases.
- CPP32 is activated by various death stimuli and plays a crucial role in apoptosis.
Purpose of the Study:
- To investigate the role of Caspase-3 (CPP32) in apoptosis.
- To explore the activation mechanisms of CPP32.
- To assess the therapeutic potential of CPP32 inhibitors.
Main Methods:
- Characterization of CPP32 activation pathways.
- Analysis of CPP32's role in processing other ICE family members.
- Evaluation of CPP32's cleavage of cellular proteins during apoptosis.
Main Results:
- Active CPP32 comprises P17 and p12 subunits, derived from a 32 kDa pro-enzyme.
- Activation can be mediated by ICE-like proteases and granzyme B.
- Activated CPP32 processes other ICE family members and cleaves cellular proteins in apoptotic cells.
Conclusions:
- Caspase-3 (CPP32) is a central protease in the apoptotic pathway.
- Inhibitors of CPP32 and related proteases show therapeutic promise for diseases characterized by excessive cell death, including neurodegenerative and autoimmune disorders.