Decreased dicer expression enhances SRP-mediated protein targeting.

Decreased dicer expression enhances SRP-mediated protein targeting.
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Dicer 表达减少增强 SRP 介导的蛋白质靶向

DOI:
10.1371/journal.pone.0056950
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Tang KF
Tang KF
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ren YF;Li G;Xue YF;Zhang XJ;Song YJ;Lv L;Wu J;Fang YX;Wang YQ;Shi KQ;Chen YP;Tang KF

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我们已经表明,Dicer将7SL RNA加工成不同的片段,范围从200多个核苷酸到200多个核苷酸。在这里,我们解决了这些7SL RNA片段的分子功能,并发现其中一些作为显性负调控全长7SL RNA,干扰信号识别颗粒(SRP)复合物的形成。这些7SL RNA片段的转染抑制细胞表面糖蛋白的表达,报告蛋白的内质网的靶向,和分泌的碱性磷酸酶的分泌。这些结果表明,一些Dicer加工的7SL RNA片段干扰了SRP介导的蛋白质靶向。此外,我们发现Dicer敲低增强了SRP介导的蛋白质靶向,并且转染7SL RNA片段的混合物部分恢复了这种效果。我们的数据表明,Dicer可以通过将一定比例的7SL RNA加工成不同长度的片段来微调SRP介导的蛋白质靶向的效率。
We have shown that Dicer processes 7SL RNA into different fragments ranging from ∼20 to more than 200 nucleotides. Here we addressed the molecular functions of these 7SL RNA fragments and found that some of them functioned as dominant-negative regulators of the full-length 7SL RNA, interfering with signal recognition particle (SRP) complex formation. Transfection of these 7SL RNA fragments inhibited the expression of cell surface glycoproteins, the targeting of a reporter protein to the endoplasmic reticulum, and the secretion of secreted alkaline phosphatase. These results suggest that some Dicer-processed 7SL RNA fragments interfered with SRP-mediated protein targeting. Moreover, we showed that Dicer knockdown enhanced SRP-mediated protein targeting and that transfection of a mixture of the 7SL RNA fragments partially restored this effect. Our data indicate that Dicer can fine-tune the efficiency of SRP-mediated protein targeting via processing a proportion of 7SL RNA into fragments of different lengths.
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