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Related Experiment Videos

Structure-function analysis of hepatitis C virus envelope-CD81 binding.

R Petracca1, F Falugi, G Galli

  • 1Chiron Research Centre, 53100 Siena, Italy.

Journal of Virology
|April 25, 2000
PubMed
Summary
This summary is machine-generated.

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Hepatitis C virus (HCV) uses CD81

Area of Science:

  • Virology
  • Immunology
  • Cell Biology

Background:

  • Hepatitis C virus (HCV) causes chronic liver disease.
  • The large extracellular loop (LEL) of human CD81 is a binding site for HCV.

Purpose of the Study:

  • To investigate the structure-function relationship of HCV-CD81 interaction.
  • To understand the role of CD81 in HCV attachment and entry into hepatocytes.

Main Methods:

  • Utilized recombinant E2 protein and soluble CD81 LEL.
  • Measured binding affinity (K(d)) and internalization rates.
  • Assessed the role of CD81 LEL disulfide bridges in HCV interaction.

Main Results:

  • HCV E2 binds CD81 LEL with high affinity (K(d) = 1.8 nM).

Related Experiment Videos

  • CD81 mediates HCV attachment to hepatocytes but has limited capacity for viral entry.
  • Disulfide bonds in CD81 LEL are crucial for HCV binding.

    • Conclusions:

    • Neutralizing antibodies require high affinity (>10(-9) M) to block HCV binding.
    • HCV attachment to hepatocytes may involve other receptors besides CD81.
    • CD81-HCV interaction is sensitive to reducing environments, suggesting disulfide bond importance.