A synthetic biology approach identifies the mammalian UPR RNA ligase RtcB.

A synthetic biology approach identifies the mammalian UPR RNA ligase RtcB.
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DOI:
10.1016/j.molcel.2014.06.032
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发表时间:
2014-09-04
期刊:
影响因子:
16
通讯作者:
Wang, Xiaozhong
Wang, Xiaozhong
中科院分区:
生物学1区
文献类型:
--
作者:
Lu, Yanyan;Liang, Feng-Xia;Wang, Xiaozhong

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未折叠蛋白反应(unfolded protein response,UPR)的祖先分支中的信号传导是由内质网(endoplasmic reticulum,ER)应激过程中HAC 1/XBP 1 mRNA的非常规剪接启动的。在哺乳动物中,已知IRE 1 α可切割XBP 1内含子。然而,负责连接两个XBP 1外显子的酶仍然未知。使用基于XBP 1剪接的合成电路,我们确定RtcB作为主要的UPR RNA连接酶。在RtcB敲除细胞中,在ER应激期间,XBP 1 mRNA剪接是有缺陷的。遗传拯救和体外剪接表明,RtcB的RNA连接酶活性是剪接XBP 1 mRNA直接所需的。总之,这些数据表明,RtcB是长期寻找的RNA连接酶,催化非常规RNA剪接在哺乳动物的UPR。
Signaling in the ancestral branch of the unfolded protein response (UPR) is initiated by unconventional splicing of HAC1/XBP1 mRNA during endoplasmic reticulum (ER) stress. In mammals, IRE1α has been known to cleave the XBP1 intron. However, the enzyme responsible for ligation of two XBP1 exons remains unknown. Using an XBP1 splicing-based synthetic circuit, we identify RtcB as the primary UPR RNA ligase. In RtcB knockout cells, XBP1 mRNA splicing is defective during ER stress. Genetic rescue and in vitro splicing show that the RNA ligase activity of RtcB is directly required for the splicing of XBP1 mRNA. Taken together, these data demonstrate that RtcB is the long sought RNA ligase that catalyzes unconventional RNA splicing during the mammalian UPR.
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