The HECTD3 E3 ubiquitin ligase facilitates cancer cell survival by promoting K63-linked polyubiquitination of caspase-8.

The HECTD3 E3 ubiquitin ligase facilitates cancer cell survival by promoting K63-linked polyubiquitination of caspase-8.
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HECTD3 E3泛素连接酶通过促进Caspase-8的K63连接的多泛素化来促进癌细胞的存活。

DOI:
10.1038/cddis.2013.464
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发表时间:
2013-11-28
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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--
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细胞凋亡抗性是癌症治疗的障碍。HECTD 3是一种新的E3泛素连接酶,它与caspase-8死亡效应结构域相互作用,并通过K63连接的多聚泛素链泛素化caspase-8,该多聚泛素链不靶向caspase-8降解,但降低caspase-8的活化。HECTD 3耗竭可使癌细胞对外源性凋亡刺激敏感。此外,HECTD 3以E3连接酶活性依赖性方式抑制TNF相关凋亡诱导配体(TRAIL)诱导的caspase-8裂解。在K215处的半胱天冬酶-8泛素化位点的突变废除了HECTD 3对TRAIL诱导的切割的保护。最后,HECTD 3在乳腺癌中经常过表达。这些发现表明,caspase-8泛素化的HECTD 3赋予癌细胞存活。
Apoptosis resistance is a hurdle for cancer treatment. HECTD3, a new E3 ubiquitin ligase, interacts with caspase-8 death effector domains and ubiquitinates caspase-8 with K63-linked polyubiquitin chains that do not target caspase-8 for degradation but decrease the caspase-8 activation. HECTD3 depletion can sensitize cancer cells to extrinsic apoptotic stimuli. In addition, HECTD3 inhibits TNF-related apoptosis-inducing ligand (TRAIL)-induced caspase-8 cleavage in an E3 ligase activity-dependent manner. Mutation of the caspase-8 ubiquitination site at K215 abolishes the HECTD3 protection from TRAIL-induced cleavage. Finally, HECTD3 is frequently overexpressed in breast carcinomas. These findings suggest that caspase-8 ubiquitination by HECTD3 confers cancer cell survival.
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