Activation of specific apoptotic caspases with an engineered small-molecule-activated protease.

Activation of specific apoptotic caspases with an engineered small-molecule-activated protease.
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DOI:
10.1016/j.cell.2010.07.014
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发表时间:
2010-08-20
期刊:
影响因子:
64.5
通讯作者:
Wells JA
Wells JA
中科院分区:
生物学1区
文献类型:
--
作者:
Gray DC;Mahrus S;Wells JA

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Apoptosis is a conserved cellular pathway that results in the activation of cysteine-aspartyl proteases, or caspases. To dissect the non-redundant roles of the executioner caspases-3, -6 and -7 in orchestrating apoptosis, we have developed an orthogonal protease to selectively activate each isoform in human cells. Our approach uses a split-Tobacco Etch Virus (TEV) protease under small-molecule control, that we call the SNIPer, with caspase alleles containing genetically encoded TEV cleavage sites. These studies reveal that all three caspases are transiently activated but only activation of caspase-3 or -7 is sufficient to induce apoptosis. Proteomic analysis shown here and from others reveals that 20 of the 33 subunits of the 26S proteasome can be cut by caspases, and we demonstrate synergy between proteasome inhibition and dose-dependent caspase activation. We propose a model of proteolytic reciprocal negative regulation with mechanistic implications for the combined clinical use of proteasome inhibitors and proapoptotic drugs.
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