Decreased dicer expression enhances SRP-mediated protein targeting.

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.

Citation

Yong-Feng Ren, Guiling Li, Yong-Feng Xue, Xue-Jiao Zhang, Yi-Jiang Song, Lu Lv, Jianmin Wu, Yu-Xiao Fang, Yu-Qun Wang, Ke-Qing Shi, Yong-Ping Chen, Kai-Fu Tang. Decreased dicer expression enhances SRP-mediated protein targeting. PloS one. 2013;8(2):e56950

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PMID: 23468895

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