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Molecular Cell Biology Laboratory, Department of Genetics, Smurfit Institute, Trinity College, Dublin 2, Ireland
Apoptosis (programmed cell death) is a physiological process used to eliminate superfluous, damaged, infected, or aged cells in multicellular organisms. During apoptosis the cellular architecture is dismantled from within in a highly controlled fashion. Members of the caspase family of cysteine proteases are responsible for the destructive phase of apoptosis. One major pathway to caspase activation involves the formation of a multisubunit protease activation complex called the apoptosome. The apoptosome is assembled in response to signals that provoke mitochondrial outer membrane permeabilization and the release of cytochrome c into the cytosol. Recent studies indicate that the apoptosome is a wheel-like structure consisting of seven molecules of Apaf-1 and a similar number of caspase-9 dimers. Knowledge of the structure of the apoptosome will likely lead to the design of therapeutic modulators of apoptosis.
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