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Open AccessArticle

Nanoparticle Encapsidation of Flock House Virus by Auto Assembly of Tobacco Mosaic Virus Coat Protein

1
Department of Biological and Pharmaceutical Sciences, Touro University, Vallejo, CA 94594, USA
2
Department of Biology, Biomedical Studies Program, Baylor University, Waco, TX 76706, USA
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Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2014, 15(10), 18540-18556; https://doi.org/10.3390/ijms151018540
Received: 8 July 2014 / Revised: 9 September 2014 / Accepted: 29 September 2014 / Published: 14 October 2014
(This article belongs to the Special Issue Supramolecular Polymers and Their Assemblies)
Tobacco Mosaic virus (TMV) coat protein is well known for its ability to self-assemble into supramolecular nanoparticles, either as protein discs or as rods originating from the ~300 bp genomic RNA origin-of-assembly (OA). We have utilized TMV self-assembly characteristics to create a novel Flock House virus (FHV) RNA nanoparticle. FHV encodes a viral polymerase supporting autonomous replication of the FHV genome, which makes it an attractive candidate for viral transgene expression studies and targeted RNA delivery into host cells. However, FHV viral genome size is strictly limited by native FHV capsid. To determine if this packaging restriction could be eliminated, FHV was adapted to express enhanced green fluorescent protein (GFP), to allow for monitoring of functional FHV RNA activity. Then TMV OA was introduced in six 3' insertion sites, with only site one supporting functional FHV GFP expression. To create nanoparticles, FHV GFP-OA modified genomic RNA was mixed in vitro with TMV coat protein and monitored for encapsidation by agarose electrophoresis and electron microscopy. The production of TMV-like rod shaped nanoparticles indicated that modified FHV RNA can be encapsidated by purified TMV coat protein by self-assembly. This is the first demonstration of replication-independent packaging of the FHV genome by protein self-assembly. View Full-Text
Keywords: Flock House virus; Tobacco Mosaic virus; encapsidation; self-assembly; nanoparticle; transgene expression; viral vector Flock House virus; Tobacco Mosaic virus; encapsidation; self-assembly; nanoparticle; transgene expression; viral vector
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Maharaj, P.D.; Mallajosyula, J.K.; Lee, G.; Thi, P.; Zhou, Y.; Kearney, C.M.; McCormick, A.A. Nanoparticle Encapsidation of Flock House Virus by Auto Assembly of Tobacco Mosaic Virus Coat Protein. Int. J. Mol. Sci. 2014, 15, 18540-18556.

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