Caspases in apoptotic death

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Caspases are cysteine proteases central to apoptosis, cleaving after aspartic acid residues.
• Their activation involves proteolytic processing and recruitment into signaling complexes, often through amplifying cascades.

Purpose of the Study:

• To elucidate the structural basis of caspase activity and substrate specificity.
• To explore the potential of caspase inhibitors for therapeutic applications in diseases with excessive apoptotic cell death.

Main Methods:

• Analysis of crystal structures of human caspase family members with bound inhibitory peptides.
• Investigating enzyme-substrate interactions and their implications for inhibitor design.

Main Results:

• Crystal structures revealed detailed mechanisms of catalysis, substrate binding, and specificity within two caspase groups.
• Inhibitors designed based on structural insights demonstrated activity in animal models of caspase-mediated cell death.

Conclusions:

• Structural biology provides critical insights into caspase function and substrate interactions.
• Caspase inhibitors hold promise for therapeutic interventions in various human diseases characterized by excessive apoptosis.