Silkworm Coatomers and Their Role in Tube Expansion of Posterior Silkgland

文献类型： 外文期刊

第一作者： Wang, Qiao

作者： Wang, Qiao;Shen, Birong;Zheng, Pengli;Feng, Hui;Chen, Liang;Zhang, Jing;Teng, Junlin;Chen, Jianguo;Chen, Jianguo;Zhang, Chuanxi;Zhang, Guozheng

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2010 年 5 卷 10 期

页码：

收录情况： SCI

摘要： Background: Coat protein complex I (COPI) vesicles, coated by seven coatomer subunits, are mainly responsible for Golgito- ER transport. Silkworm posterior silkgland (PSG), a highly differentiated secretory tissue, secretes fibroin for silk production, but many physiological processes in the PSG cells await further investigation. Methodology/Principal Findings: Here, to investigate the role of silkworm COPI, we cloned six silkworm COPI subunits (alpha,beta,beta', delta, epsilon, and zeta-COP), determined their peak expression in day 2 in fifth-instar PSG, and visualized the localization of COPI, as a coat complex, with cis-Golgi. By dsRNA injection into silkworm larvae, we suppressed the expression of alpha-, beta'- and gamma-COP, and demonstrated that COPI subunits were required for PSG tube expansion. Knockdown of alpha-COP disrupted the integrity of Golgi apparatus and led to a narrower glandular lumen of the PSG, suggesting that silkworm COPI is essential for PSG tube expansion. Conclusions/Significance: The initial characterization reveals the essential roles of silkworm COPI in PSG. Although silkworm COPI resembles the previously characterized coatomers in other organisms, some surprising findings require further investigation. Therefore, our results suggest the silkworm as a model for studying intracellular transport, and would facilitate the establishment of silkworm PSG as an efficient bioreactor.

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