Decreased Dicer Expression Enhances SRP-Mediated Protein Targeting

Ren, Yong-Feng; Li, Guiling; Xue, Yong-Feng; Zhang, Xue-Jiao; Song, Yi-Jiang; Lv, Lu; Wu, Jianmin; Fang, Yu-Xiao; Wang, Yu-Qun; Shi, Ke-Qing; Chen, Yong-ping; Tang, Kai-Fu
February 2013
PLoS ONE;Feb2013, Vol. 8 Issue 2, p1
Academic Journal
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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