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Related Experiment Video

Updated: Mar 16, 2026

Rapid Assessment of Membrane Protein Quality by Fluorescent Size Exclusion Chromatography
06:26

Rapid Assessment of Membrane Protein Quality by Fluorescent Size Exclusion Chromatography

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Membrane Flotation Assay.

Dorothee A Vogt1, Melanie Ott1

  • 1Gladstone Institute for Virology and Immunology, San Francisco, USA.

Bio-Protocol
|August 20, 2016
PubMed
Summary
This summary is machine-generated.

Hepatitis C virus (HCV) hijacks cellular membranes, especially lipid droplets, for RNA replication. This study uses a membrane flotation assay to analyze viral protein association with these lipid-rich membranes during the HCV life cycle.

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Area of Science:

  • Virology
  • Cell Biology
  • Biochemistry

Background:

  • Positive-stranded RNA viruses, including Hepatitis C virus (HCV), extensively utilize host cellular membranes.
  • These hijacked membranes, such as the Golgi, ER, mitochondria, and lipid droplets, are crucial for viral RNA genome replication and new virion assembly.
  • Understanding viral protein interactions with cellular membranes is key to elucidating their roles in the viral life cycle.

Purpose of the Study:

  • To investigate the specific role of lipid droplets and lipid-rich membranes in the Hepatitis C virus (HCV) life cycle.
  • To analyze the association of viral proteins with cellular membranes, particularly during HCV RNA replication.

Main Methods:

  • Utilized a membrane flotation assay employing a 10-20-30% iodixanol density gradient.
  • Cells were mechanically disrupted in a detergent-free buffer to preserve membrane integrity.
  • Separated membrane-bound viral proteins by density gradient centrifugation and analyzed fractions via SDS-PAGE and western blotting.

Main Results:

  • The membrane flotation assay successfully separated membrane particles based on their buoyant characteristics, influenced by lipid content and associated proteins.
  • This method allowed for the analysis of viral protein association with different membrane fractions.

Conclusions:

  • The study provides a method to investigate the role of lipid-rich membranes in HCV RNA replication.
  • Further analysis of separated fractions can reveal specific viral protein-membrane interactions critical for the HCV life cycle.