1887

Abstract

The hepatitis C virus (HCV) NS5A protein plays a critical role in viral RNA replication and has recently been shown to play a role in particle production in the infectious genotype 2a HCV clone (JFH-1). Here, we show that alanine substitutions of serines 2428/2430 within the C-terminal domain III of NS5A do not affect subgenomic replicon RNA replication but do reduce particle production. In contrast, substitution of serines 2390/2391 had no effect on either RNA replication or particle production. Relative to genotype 1, all genotype 2 HCV isolates contain a 19 residue insertion near the C terminus of domain III which, when deleted (▵2408–2426), resulted in a delay to both RNA replication and particle production. None of these mutations affected the ratio of basal to hyperphosphorylated NS5A, suggesting that serines between residues 2390 and 2430 are not phosphorylated. We propose that although domain III is dispensable for RNA replication, it nevertheless influences this process.

Loading

Article metrics loading...

/content/journal/jgv/10.1099/vir.0.009332-0
2009-06-01
2024-04-16
Loading full text...

Full text loading...

/deliver/fulltext/jgv/90/6/1329.html?itemId=/content/journal/jgv/10.1099/vir.0.009332-0&mimeType=html&fmt=ahah

References

  1. Aoubala M., Holt J., Clegg R. A., Rowlands D. J., Harris M. 2001; The inhibition of cAMP-dependent protein kinase by full-length hepatitis C virus NS3/4A complex is due to ATP hydrolysis. J Gen Virol 82:1637–1646
    [Google Scholar]
  2. Appel N., Pietschmann T., Bartenschlager R. 2005; Mutational analysis of hepatitis C virus nonstructural protein 5A: potential role of differential phosphorylation in RNA replication and identification of a genetically flexible domain. J Virol 79:3187–3194 [CrossRef]
    [Google Scholar]
  3. Appel N., Zayas M., Miller S., Krijnse-Locker J., Schaller T., Friebe P., Kallis S., Engel U., Bartenschlager R. 2008; Essential role of domain III of nonstructural protein 5A for hepatitis C virus infectious particle assembly. PLoS Pathog 4:e1000035 [CrossRef]
    [Google Scholar]
  4. Barba G., Harper F., Harada T., Kohara M., Goulinet S., Matsuura Y., Eder G., Schaff Z., Chapman M. J. other authors 1997; Hepatitis C virus core protein shows a cytoplasmic localization and associates to cellular lipid storage droplets. Proc Natl Acad Sci U S A 94:1200–1205 [CrossRef]
    [Google Scholar]
  5. Harris M., Coates K. 1993; Identification of cellular proteins that bind to the human immunodeficiency virus type 1 nef gene product in vitro : a role for myristylation. J Gen Virol 74:1581–1589 [CrossRef]
    [Google Scholar]
  6. Jones D. M., Gretton S. N., McLauchlan J., Targett-Adams P. 2007; Mobility analysis of an NS5A-GFP fusion protein in cells actively replicating hepatitis C virus subgenomic RNA. J Gen Virol 88:470–475 [CrossRef]
    [Google Scholar]
  7. Katze M. G., Kwieciszewski B., Goodlett D. R., Blakely C. M., Neddermann P., Tan S. L., Aebersold R. 2000; Ser(2194) is a highly conserved major phosphorylation site of the hepatitis C virus nonstructural protein NS5A. Virology 278:501–513 [CrossRef]
    [Google Scholar]
  8. Kuiken C., Yusim K., Boykin L., Richardson R. 2005; The Los Alamos hepatitis C sequence database. Bioinformatics 21:379–384 [CrossRef]
    [Google Scholar]
  9. Macdonald A., Crowder K., Street A., McCormick C., Saksela K., Harris M. 2003; The hepatitis C virus NS5A protein inhibits activating protein-1 (AP1) function by perturbing Ras–ERK pathway signalling. J Biol Chem 278:17775–17784 [CrossRef]
    [Google Scholar]
  10. Masaki T., Suzuki R., Murakami K., Aizaki H., Ishii K., Murayama A., Date T., Matsuura Y., Miyamura T. other authors 2008; Interaction of hepatitis C virus nonstructural protein 5A with core protein is critical for the production of infectious virus particles. J Virol 82:7964–7976 [CrossRef]
    [Google Scholar]
  11. McCormick C. J., Brown D., Griffin S., Challinor L., Rowlands D. J., Harris M. 2006a; A link between translation of the hepatitis C virus polyprotein and polymerase function; possible consequences for hyperphosphorylation of NS5A. J Gen Virol 87:93–102 [CrossRef]
    [Google Scholar]
  12. McCormick C. J., Maucourant S., Griffin S., Rowlands D. J., Harris M. 2006b; Tagging of NS5A expressed from a functional hepatitis C virus replicon. J Gen Virol 87:635–640 [CrossRef]
    [Google Scholar]
  13. Miyanari Y., Atsuzawa K., Usuda N., Watashi K., Hishiki T., Zayas M., Bartenschlager R., Wakita T., Hijikata M., Shimotohno K. 2007; The lipid droplet is an important organelle for hepatitis C virus production. Nat Cell Biol 9:1089–1097 [CrossRef]
    [Google Scholar]
  14. Moradpour D., Evans M. J., Gosert R., Yuan Z., Blum H. E., Goff S. P., Lindenbach B. D., Rice C. M. 2004; Insertion of green fluorescent protein into nonstructural protein 5A allows direct visualization of functional hepatitis C virus replication complexes. J Virol 78:7400–7409 [CrossRef]
    [Google Scholar]
  15. Neddermann P., Quintavalle M., Di Pietro C., Clementi A., Cerretani M., Altamura S., Bartholomew L., De Francesco R. 2004; Reduction of hepatitis C virus NS5A hyperphosphorylation by selective inhibition of cellular kinases activates viral RNA replication in cell culture. J Virol 78:13306–13314 [CrossRef]
    [Google Scholar]
  16. Pietschmann T., Kaul A., Koutsoudakis G., Shavinskaya A., Kallis S., Steinmann E., Abid K., Negro F., Dreux M. other authors 2006; Construction and characterization of infectious intragenotypic and intergenotypic hepatitis C virus chimeras. Proc Natl Acad Sci U S A 103:7408–7413 [CrossRef]
    [Google Scholar]
  17. Quintavalle M., Sambucini S., Summa V., Orsatti L., Talamo F., De F. R., Neddermann P. 2007; Hepatitis C virus NS5A is a direct substrate of casein kinase I- α , a cellular kinase identified by inhibitor affinity chromatography using specific NS5A hyperphosphorylation inhibitors. J Biol Chem 282:5536–5544 [CrossRef]
    [Google Scholar]
  18. Reed K. E., Xu J., Rice C. M. 1997; Phosphorylation of the hepatitis C virus NS5A protein in vitro and in vivo : properties of the NS5A-associated kinase. J Virol 71:7187–7197
    [Google Scholar]
  19. Shepard C. W., Finelli L., Alter M. J. 2005; Global epidemiology of hepatitis C virus infection. Lancet Infect Dis 5:558–567 [CrossRef]
    [Google Scholar]
  20. Tanji Y., Kaneko T., Satoh S., Shimotohno K. 1995; Phosphorylation of hepatitis C virus-encoded nonstructural protein NS5A. J Virol 69:3980–3986
    [Google Scholar]
  21. Tellinghuisen T. L., Marcotrigiano J., Gorbalenya A. E., Rice C. M. 2004; The NS5A protein of hepatitis C virus is a zinc metalloprotein. J Biol Chem 279:48576–48587 [CrossRef]
    [Google Scholar]
  22. Tellinghuisen T. L., Marcotrigiano J., Rice C. M. 2005; Structure of the zinc-binding domain of an essential component of the hepatitis C virus replicase. Nature 435:374–379 [CrossRef]
    [Google Scholar]
  23. Tellinghuisen T. L., Foss K. L., Treadaway J. 2008a; Regulation of hepatitis C virion production via phosphorylation of the NS5A protein. PLoS Pathog 4:e1000032 [CrossRef]
    [Google Scholar]
  24. Tellinghuisen T. L., Foss K. L., Treadaway J. C., Rice C. M. 2008b; Identification of residues required for RNA replication in domains II and III of the hepatitis C virus NS5A protein. J Virol 82:1073–1083 [CrossRef]
    [Google Scholar]
  25. Wakita T., Pietschmann T., Kato T., Date T., Miyamoto M., Zhao Z., Murthy K., Habermann A., Kräusslich H. G. other authors 2005; Production of infectious hepatitis C virus in tissue culture from a cloned viral genome. Nat Med 11:791–796 [CrossRef]
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journal/jgv/10.1099/vir.0.009332-0
Loading
/content/journal/jgv/10.1099/vir.0.009332-0
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error