Decreased Dicer Expression Enhances SRP-Mediated Protein Targeting |
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Authors: | 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 |
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Institution: | 1. Institute of Genomic Medicine, Wenzhou Medical College, Wenzhou, Zhejiang Province, People''s Republic of China.; 2. Department of Infection and Liver Diseases, Liver Research Center, Wenzhou Medical College, Wenzhou, Zhejiang Province, People''s Republic of China.; Institute of Molecular Genetics IMG-CNR, Italy, |
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Abstract: | 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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