Caspase enzymology and activation mechanisms

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Apical caspases (8, 9, 10) are crucial proteases initiating apoptosis.
• These caspases are active only as dimers, which are inherently unstable in vitro.
• Characterizing apical caspase function requires methods to stabilize their dimeric form.

Purpose of the Study:

• To provide updated and comprehensive methods for studying apical caspase activity.
• To enable researchers to investigate caspase function, activation, and regulation in vitro and in cells.
• To facilitate the study of therapeutic strategies targeting caspase inhibition.

Main Methods:

• In vitro activation of caspases using kosmotropic reagents.
• Fusion of caspase domains to engineered dimerization domains for regulated dimerization.
• Determination of caspase activity profiles within cellular contexts.
• Assessment of SMAC-mimetic reagents' ability to release caspase inhibition by IAPs.

Main Results:

• Established protocols for in vitro caspase activation and dimerization.
• Demonstrated utility of engineered dimerization domains for controlled caspase activation.
• Developed methods for cellular caspase activity profiling.
• Provided a framework for studying IAP inhibition and its reversal.

Conclusions:

• The presented methods enable robust characterization of apical caspase function.
• These techniques are valuable for understanding apoptosis regulation and developing novel therapeutics.
• The study offers essential tools for researchers in cell death and protease research.