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
Shi, YG
中科院分区:
生物学1区
文献类型:
--
作者:
Chai, JJ;Shiozaki, E;Shi, YG

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凋亡抑制剂 (IAP) 蛋白通过抑制半胱天冬酶的催化活性来抑制细胞死亡。在这里,我们展示了 caspase-7 与 XIAP 的有效抑制片段复合物的晶体结构,分辨率为 2.45 埃。 18 个残基的 XIAP 肽与 caspase-7 的催化槽结合,与其催化活性所必需的残基进行广泛接触。引人注目的是,尽管相对方向相反,但 caspase-7 和 XIAP 之间的一部分相互作用与 caspase-7 及其四肽抑制剂 DEVD-CHO 之间的相互作用非常相似。我们的生化和结构分析表明,BIR 结构域对于 caspase-3 和 -7 的抑制是可有可无的。该研究为下一代 caspase 抑制剂的设计提供了结构基础。
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.