Related Experiment Video
Updated: Jun 6, 2026
09:35
Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
Published on: February 1, 2017
Visualization of the structures of the hepatitis C virus replication complex
Shih-Ching Chan1, Shih-Yen Lo, Je-Wen Liou
1Graduate Institute of Molecular and Cellular Biology, Tzu Chi University, Hualien, Taiwan.
Biochemical and Biophysical Research Communications
|December 15, 2010
Summary
Hepatitis C virus RNA replication occurs on lipid rafts, forming distinct 0.7 um particles. Disrupting lipid raft proteins inhibits viral replication and particle formation.
Area of Science:
- Virology
- Cell Biology
- Membrane Biology
Background:
- Hepatitis C virus (HCV) RNA synthesis is linked to cellular membrane structures.
- Lipid rafts are specialized membrane microdomains involved in various cellular processes, including viral replication.
Purpose of the Study:
- To investigate the physical structure of Hepatitis C virus replication complexes within lipid rafts.
- To determine the role of specific lipid raft-associated proteins in HCV replication and particle formation.
Main Methods:
- Purification of lipid raft membrane fractions using membrane flotation analysis.
- Microscopic observation of purified fractions using transmission electron microscopy (TEM) and atomic force microscopy (AFM).
- Gene silencing (knockdown) of seven key lipid raft-associated proteins in HCV replicon cells.
Main Results:
- Distinct particles approximately 0.7 um in size were identified in lipid raft fractions from HCV-infected cells, but not in control cells.
- The Hepatitis C virus NS5A protein was found to be associated with these specialized particles.
- Fusion of these particles into larger structures (up to 10 um) was observed after freeze-thawing.
- Knockdown of VAPA, COPG, RAB18, COMT, CDC42, DPP4, and KDELR2 significantly reduced particle numbers and suppressed HCV replication.
Conclusions:
- Hepatitis C virus replication complexes assemble into distinct particle structures within lipid raft membrane domains.
- Specific lipid raft-associated proteins are crucial for the formation of these particles and efficient HCV replication.
Related Concept Videos
01:25Hepatitis
Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...
01:28Viral Hepatitis I: Introduction
Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...
00:56Viral Structure
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
01:26Size and Structure of Viral Genomes
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
01:25Inhibitors Of Virion Release
Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...