Three-dimensional architecture and biogenesis of membrane structures associated with hepatitis C virus replication

PLoS Pathog. 2012;8(12):e1003056. doi: 10.1371/journal.ppat.1003056. Epub 2012 Dec 6.

Abstract

All positive strand RNA viruses are known to replicate their genomes in close association with intracellular membranes. In case of the hepatitis C virus (HCV), a member of the family Flaviviridae, infected cells contain accumulations of vesicles forming a membranous web (MW) that is thought to be the site of viral RNA replication. However, little is known about the biogenesis and three-dimensional structure of the MW. In this study we used a combination of immunofluorescence- and electron microscopy (EM)-based methods to analyze the membranous structures induced by HCV in infected cells. We found that the MW is derived primarily from the endoplasmic reticulum (ER) and contains markers of rough ER as well as markers of early and late endosomes, COP vesicles, mitochondria and lipid droplets (LDs). The main constituents of the MW are single and double membrane vesicles (DMVs). The latter predominate and the kinetic of their appearance correlates with kinetics of viral RNA replication. DMVs are induced primarily by NS5A whereas NS4B induces single membrane vesicles arguing that MW formation requires the concerted action of several HCV replicase proteins. Three-dimensional reconstructions identify DMVs as protrusions from the ER membrane into the cytosol, frequently connected to the ER membrane via a neck-like structure. In addition, late in infection multi-membrane vesicles become evident, presumably as a result of a stress-induced reaction. Thus, the morphology of the membranous rearrangements induced in HCV-infected cells resemble those of the unrelated picorna-, corona- and arteriviruses, but are clearly distinct from those of the closely related flaviviruses. These results reveal unexpected similarities between HCV and distantly related positive-strand RNA viruses presumably reflecting similarities in cellular pathways exploited by these viruses to establish their membranous replication factories.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • Endoplasmic Reticulum* / metabolism
  • Endoplasmic Reticulum* / ultrastructure
  • Endoplasmic Reticulum* / virology
  • Hepacivirus* / physiology
  • Hepacivirus* / ultrastructure
  • Hepatitis C* / metabolism
  • Hepatitis C* / pathology
  • Humans
  • Intracellular Membranes* / metabolism
  • Intracellular Membranes* / ultrastructure
  • Intracellular Membranes* / virology
  • Microscopy, Electron, Transmission / methods
  • RNA, Viral / biosynthesis*
  • Virus Replication / physiology

Substances

  • RNA, Viral

Grants and funding

This work was supported by the Deutsche Forschungsgemeinschaft (Transregional Collaborative Research Project TR83, TP13 and research grant BA1505/2-2, both to RB) and the Cell Networks Cluster of Excellence. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.