Abstract
Main conclusion
A RhoA-derived peptide fused to carrier molecules from plants showed enhanced biological activity of in vitro assays against respiratory syncytial virus compared to the RhoA peptide alone or the synthetic RhoA peptide.
A RhoA-derived peptide has been reported for over a decade as a potential inhibitor of respiratory syncytial virus (RSV) infection both in vitro and in vivo and is anticipated to be a promising alternative to monoclonal antibody-based therapy against RSV infection. However, there are several challenges to furthering development of this antiviral peptide, including improvement in the peptide’s bioavailability, development of an efficient delivery system and identification of a cost-effective production platform. In this study, we have engineered a RhoA peptide as a genetic fusion to two carrier molecules, either lichenase (LicKM) or the coat protein (CP) of Alfalfa mosaic virus. These constructs were introduced into Nicotiana benthamiana plants using a tobacco mosaic virus-based expression vector and targets purified. The results demonstrated that the RhoA peptide fusion proteins were efficiently expressed in N. benthamiana plants, and that two of the resulting fusion proteins, RhoA-LicKM and RhoA2-FL-d25CP, inhibited RSV growth in vitro by 50 and 80 %, respectively. These data indicate the feasibility of transient expression of this biologically active antiviral RhoA peptide in plants and the advantage of using a carrier molecule to enhance target expression and efficacy.
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Acknowledgments
The authors are grateful to Dr. Natasha Kushnir for editorial assistance. We also thank CONACyT Mexico for the grant 154790 and scholarship 233531, granted to Ortega-Berlanga for her PhD studies
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425_2015_2416_MOESM1_ESM.tif
Figure 1S. SDS-PAGE of LickM-fusion and CP-fusion proteins after purification. (A) Coomassie gel of LickM fusion protein (PR-RhoA2-FL-F-3-HK). M: Molecular marker (See blue); 1: Elution fraction 100 mM imidazole; 2: Elution fraction 300 mM imidazole; 3: Elution fraction 500 mM imidazole. (B) Coomassie gel of CP-fusion proteins; M: Molecular marker (See blue); 1: RhoA-d25CP construct; 2: RhoA-FL-d25CP construct. (TIFF 909 kb)
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Ortega-Berlanga, B., Musiychuk, K., Shoji, Y. et al. Engineering and expression of a RhoA peptide against respiratory syncytial virus infection in plants. Planta 243, 451–458 (2016). https://doi.org/10.1007/s00425-015-2416-z
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DOI: https://doi.org/10.1007/s00425-015-2416-z