A class of allosteric caspase inhibitors identified by high-throughput screening.

A class of allosteric caspase inhibitors identified by high-throughput screening.
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DOI:
10.1016/j.molcel.2012.06.007
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发表时间:
2012-08-24
期刊:
影响因子:
16
通讯作者:
Jiang, Xuejun
Jiang, Xuejun
中科院分区:
生物学1区
文献类型:
--
作者:
Feldman, Taya;Kabaleeswaran, Venkataraman;Jang, Se Bok;Antczak, Christophe;Djaballah, Hakim;Wu, Hao;Jiang, Xuejun

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半胱天冬酶抑制是治疗多种疾病的有前途的方法。使用重构测定和高通量筛选,我们鉴定了一组非肽胱天蛋白酶抑制剂。这些抑制剂具有共同的化学骨架,表明相同的作用机制。它们可以抑制由多种刺激诱导的各种细胞类型的凋亡;它们还可以抑制巨噬细胞中半胱天冬酶-1介导的白细胞介素产生,表明潜在的抗炎应用。虽然这些化合物抑制所有测试的半胱天冬酶,动力学分析表明,它们不竞争酶的催化位点。这些化合物之一与半胱天冬酶-7的共晶体结构揭示了它结合到半胱天冬酶的二聚化界面,这是所有活性半胱天冬酶共享的另一个共同结构元件。同时,生物化学分析表明,该化合物减弱了胱天蛋白酶-8二聚化。基于这些动力学,生化和结构分析,我们认为,这些化合物是变构的半胱天冬酶抑制剂,通过结合到半胱天冬酶的二聚化界面的功能。
Caspase inhibition is a promising approach for treating multiple diseases. Using a reconstituted assay and high-throughput screening, we identified a group of non-peptide caspase inhibitors. These inhibitors share common chemical scaffolds, suggesting same mechanism of action. They can inhibit apoptosis in various cell types induced by multiple stimuli; they can also inhibit caspase-1-mediated interleukin generation in macrophages, indicating potential anti-inflammatory application. While these compounds inhibit all the tested caspases, kinetic analysis indicates they do not compete for the catalytic sites of the enzymes. The co-crystal structure of one of these compounds with caspase-7 reveals that it binds to the dimerization interface of the caspase, another common structural element shared by all active caspases. Consistently, biochemical analysis demonstrates that the compound abates caspase-8 dimerization. Based on these kinetic, biochemical, and structural analyses, we suggest that these compounds are allosteric caspase inhibitors that function through binding to the dimerization interface of caspases.
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