Structural basis of caspase-7 inhibition by XIAP
Structural basis of caspase-7 inhibition by XIAP
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DOI:
10.1016/s0092-8674(02)02034-2
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发表时间:
2001-03-09
期刊:
影响因子:
64.5
通讯作者:
Shi, YG
中科院分区:
文献类型:
--
作者:
Chai, JJ;Shiozaki, E;Shi, YG
The inhibitor of apoptosis (IAP) proteins suppress cell death by inhibiting the catalytic activity of caspases. Here we present the crystal structure of caspase-7 in complex with a potent inhibitory fragment from XIAP at 2.45 Angstrom resolution. An 18-residue XIAP peptide binds the catalytic groove of caspase-7, making extensive contacts to the residues that are essential for its catalytic activity. Strikingly, despite a reversal of relative orientation, a subset of interactions between caspase-7 and XIAP closely resemble those between caspase-7 and its tetrapeptide inhibitor DEVD-CHO. Our biochemical and structural analyses reveal that the BIR domains are dispensable for the inhibition of caspase-3 and -7. This study provides a structural basis for the design of the next-generation caspase inhibitors.