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Protein–protein recognition as a first step towards the inhibition of XIAP and Survivin anti‐apoptotic proteins

Apoptosis, also called programmed cell death, is a conserved mechanism inherent to all cells that sentences them to death when they receive the appropriate external stimuli. Inhibitor of apoptosis proteins (IAPs) are a family of regulatory proteins that suppress such cell death. XIAP is the most commonly studied member of the IAP family. It binds to and inhibits Caspases, an important family of apoptotic proteases. In addition, XIAP over‐expression has been detected in numerous types of cancer. Smac/DIABLO, a mitochondrial protein that binds to IAPs and promotes Caspase activation, has the opposite action to XIAP and can be considered a key protein in the regulation of IAPs. Survivin, the smallest IAP protein, has received a lot of attention due to its specific expression in many cancer cell lines. It has been shown to interact with Smac/DIABLO, even though the structure of this complex has not yet been reported.