1887

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Volume 90, Issue 4

Expression of hepatitis C virus (HCV) structural proteins facilitates encapsidation and transmission of HCV subgenomic RNA Free

Abstract

A characteristic of many positive-strand RNA viruses is that, whilst replication of the viral genome is dependent on the expression of the majority of non-structural proteins , virus particle formation can occur when most or all of the structural proteins are co-expressed . Making use of a recently identified hepatitis C virus (HCV) isolate (JFH1) that can be propagated in tissue culture, this study sought to establish whether this is also the case for hepaciviruses. Stable cell lines containing one of two bicistronic replicons derived from the JFH1 isolate were generated that expressed non-structural proteins NS3–5B or NS2–5B. Release and transmission of these replicons to naïve Huh7 cells could then be demonstrated when baculovirus transduction was used to express the HCV proteins absent from the subgenomic replicons. Transmission could be blocked by a neutralizing antibody targeted at the E2 envelope protein, consistent with this phenomenon occurring via -encapsidation of replicon RNA into virus-like particles. Transmission was also dependent on expression of NS2, which was most effective at promoting virus particle formation when expressed on the replicon RNA compared with via baculovirus delivery. Density gradient analysis of the particles revealed the presence of a broad infectious peak between 1.06 and 1.11 g ml, comparable to that seen when propagating full-length virus in tissue culture. In summary, the -encapsidation system described offers a complementary and safer approach to study HCV particle formation and transmission in tissue culture.

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2009-04-01
2024-04-18
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Expression of hepatitis C virus (HCV) structural proteins in trans facilitates encapsidation and transmission of HCV subgenomic RNA
J. Gen. Virol. 90, 833 (2009); https://doi.org/10.1099/vir.2008.006049-0
/content/journal/jgv/10.1099/vir.2008.006049-0
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