Tetratricopeptide repeat domain 3 overexpression tends to form aggregates and inhibit ubiquitination and degradation of DNA polymerase γ.

Tetratricopeptide repeat domain 3 overexpression tends to form aggregates and inhibit ubiquitination and degradation of DNA polymerase γ.
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四肽重复结构域 3 过表达往往会形成聚集体并抑制 DNA 聚合酶 γ 的泛素化和降解

DOI:
10.18632/oncotarget.22476
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发表时间:
2017-12-05
期刊:
影响因子:
--
通讯作者:
Dou F
Dou F
中科院分区:
其他
文献类型:
--
作者:
Gong Y;Wang X;Shang X;Xiao SP;Li W;Shang Y;Dou F

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三肽重复序列(TPR)结构域3(TTC3)是一种含有典型的RING指和TPR基序的蛋白质。它由位于唐氏综合征关键区(DSCR)的TTC3基因编码。在这项研究中,我们使用酵母双杂交试验来鉴定几种与TTC3物理相互作用的蛋白质,包括热休克蛋白和DNA聚合酶γ(POLG)。当TTC3在哺乳动物细胞中过表达时,POLG的泛素化被抑制,其降解减慢。高TTC3蛋白表达导致细胞内TTC3聚集体的发展,其也含有POLG。与Hsp70共表达或将TTC3基因置于诱导型启动子的控制下减轻了聚集并促进了POLG降解。由于POLG对衰老过程的影响,我们提出TTC3的拷贝数变异可能有助于唐氏综合征的发病机制。
Tetratricopeptide repeat (TPR) domain 3 (TTC3) is a protein that contains canonical RING finger and TPR motifs. It is encoded by the TTC3 gene located in the Down syndrome critical region (DSCR). In this study, we used a yeast two-hybrid assay to identify several proteins that physically interact with TTC3, including heat shock proteins and DNA polymerase γ (POLG). When TTC3 was overexpressed in mammalian cells, the ubiquitination of POLG was inhibited and its degradation slowed. High TTC3 protein expression led to the development of intracellular TTC3 aggregates, which also contained POLG. Co-expression with Hsp70 or placing the TTC3 gene under control of an inducible promoter alleviated the aggregation and facilitated POLG degradation. As a result of POLG's effects on aging processes, we propose that a copy number variant of the TTC3 may contribute to Down syndrome pathogenesis.
DOI: 10.1158/1078-0432.ccr-09-2990
发表时间: 2010-09-01
影响因子: 11.5
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