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Related Experiment Videos

Direct interaction between nucleolin and hepatitis C virus NS5B.

Masaaki Hirano1, Shuichi Kaneko, Tatsuya Yamashita

  • 1Department of Molecular Oncology, Cancer Research Institute, Ishikawa 920-0934, Japan.

The Journal of Biological Chemistry
|November 13, 2002
PubMed
Summary

Hepatitis C virus NS5B protein binds to nucleolin, affecting viral replication. This interaction, involving specific sites on NS5B and the C-terminus of nucleolin, influences NS5B

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Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Hepatitis C virus (HCV) NS5B is the RNA-dependent RNA polymerase (RdRP) essential for viral replication.
  • Understanding NS5B's interactions and localization is crucial for developing antiviral strategies.

Purpose of the Study:

  • To investigate the subcellular localization of an HCV NS5B mutant (NS5Bt).
  • To explore the interaction between HCV NS5B and nucleolin.
  • To identify the functional significance of the NS5B-nucleolin interaction in viral replication.

Main Methods:

  • Expression of green fluorescent protein (GFP)-fused NS5B and its mutant (NS5Bt) in cells.
  • Confocal microscopy to observe subcellular localization and colocalization.
  • GST pull-down assays to demonstrate and map the interaction between NS5B and nucleolin.

Related Experiment Videos

  • Alanine substitution mutagenesis of NS5B to identify binding sites.

    • Main Results:

    • GFP-NS5Bt localized exclusively to the nucleolus.
    • Endogenous nucleolin distribution was altered by GFP-NS5B expression, showing colocalization in nucleoli and perinuclear regions.
    • GST pull-down assays confirmed NS5B-nucleolin interaction, with the C-terminal region of nucleolin being important.
    • Specific NS5B amino acid residues (208-214 and 500-506) were identified as crucial for nucleolin binding.
    • The NS5B-nucleolin interaction site (500-506) is essential for NS5B oligomerization and RNA-dependent RNA polymerase (RdRP) activity.
    • Nucleolin inhibited NS5B RdRP activity in a dose-dependent manner.

    Conclusions:

    • HCV NS5B interacts with nucleolin, suggesting a role for this binding in NS5B functions.
    • The interaction involves specific domains on both NS5B and nucleolin.
    • Nucleolin binding may modulate NS5B's RNA-dependent RNA polymerase activity, potentially impacting HCV replication.