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Open AccessArticle

Effects of Osiris9a on Silk Properties in Bombyx mori Determined by Transgenic Overexpression

State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
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These authors contributed equally to this work.
Int. J. Mol. Sci. 2020, 21(5), 1888; https://doi.org/10.3390/ijms21051888
Received: 5 February 2020 / Revised: 7 March 2020 / Accepted: 8 March 2020 / Published: 10 March 2020
(This article belongs to the Section Materials Science)
Osiris is an insect-specific gene family with multiple biological roles in development, phenotypic polymorphism, and protection. In the silkworm, we have previously identified twenty-five Osiris genes with high evolutionary conservation and remarkable synteny among several insects. Bombxy mori Osiris9a (BmOsi9a) is expressed only in the silk gland, particularly in the middle silk gland (MSG). However, the biological function of BmOsi9a is still unknown. In this study, we overexpressed BmOsi9a in the silk gland by germline transgene expression. BmOsi9a was overexpressed not only in the MSG but also in the posterior silk gland (PSG). Interestingly, BmOsi9a could be secreted into the lumen in the MSG but not in the PSG. In the silk fiber, overexpressed BmOsi9a interacted with Sericin1 in the MSG, as confirmed by a co-immunoprecipitation assay. The overexpression of BmOsi9a altered the secondary structure and crystallinity of the silk fiber, thereby changing the mechanical properties. These results provide insight into the mechanisms underlying silk proteins secretion and silk fiber formation. View Full-Text
Keywords: Osiris; transgenic overexpression; sericin; mechanical properties; silk; silkworm Osiris; transgenic overexpression; sericin; mechanical properties; silk; silkworm
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MDPI and ACS Style

Cheng, T.; Zhang, X.; Peng, Z.; Fan, Y.; Zhang, L.; Liu, C. Effects of Osiris9a on Silk Properties in Bombyx mori Determined by Transgenic Overexpression. Int. J. Mol. Sci. 2020, 21, 1888. https://doi.org/10.3390/ijms21051888

AMA Style

Cheng T, Zhang X, Peng Z, Fan Y, Zhang L, Liu C. Effects of Osiris9a on Silk Properties in Bombyx mori Determined by Transgenic Overexpression. International Journal of Molecular Sciences. 2020; 21(5):1888. https://doi.org/10.3390/ijms21051888

Chicago/Turabian Style

Cheng, Tingcai; Zhang, Xia; Peng, Zhangchuan; Fan, Yinfeng; Zhang, Lin; Liu, Chun. 2020. "Effects of Osiris9a on Silk Properties in Bombyx mori Determined by Transgenic Overexpression" Int. J. Mol. Sci. 21, no. 5: 1888. https://doi.org/10.3390/ijms21051888

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