Related Experiment Video

Updated: Jun 20, 2026

A Protocol for Analyzing Hepatitis C Virus Replication
13:04

A Protocol for Analyzing Hepatitis C Virus Replication

Published on: June 26, 2014

Hepatitis C virus NS2/3 protease regulates HCV IRES-dependent translation and NS5B RdRp activity

Yinglong She1, Tao Han, Linbai Ye

  • 1State Key Laboratory of Virology, College of Life Science, Wuhan Univerisity, 430072, Wuhan, Hubei, Poeple's Republic of China. swani@tom.com

Archives of Virology
|August 19, 2009
PubMed

Insights

Hepatitis C virus (HCV) NS2/3 protease regulates viral replication and translation. Both processed and unprocessed forms inhibit translation, while the unprocessed form also reduces replication, impacting persistent infection.

Area of Science:

  • Virology
  • Molecular Biology
  • Hepatology

Background:

  • Chronic hepatitis C virus (HCV) infection is a major cause of liver cancer.
  • NS2/3 protease is essential for processing the HCV polyprotein.
  • Understanding NS2/3 protease function is crucial for controlling HCV infection.

Purpose of the Study:

  • To investigate the role of NS2/3 protease in regulating HCV replication and translation.
  • To determine the impact of NS2/3 protease activity on HCV RNA translation and replication.

Main Methods:

  • Utilized cell transfection with plasmids encoding wild-type or mutant NS2/3 proteases.
  • Employed dual-luciferase reporter constructs with an HCV internal ribosome entry site (IRES) to assess translation.
  • Assessed HCV NS5B RNA-dependent RNA polymerase (RdRp) activity to examine replication.

Main Results:

  • Both autocleavage-processed and uncleaved NS2/3 protease forms significantly inhibit HCV IRES-directed translation.
  • The uncleaved form of NS2/3 protease was found to decrease HCV NS5B RdRp activity, indicating reduced replication.
  • These findings suggest NS2/3 protease autoregulates both viral translation and replication.

Conclusions:

  • NS2/3 protease plays a critical role in the autoregulation of HCV replication and translation.
  • This autoregulation mechanism may be vital for maintaining persistent HCV infection.
  • Targeting NS2/3 protease function could offer new therapeutic strategies against chronic hepatitis C.

More Related Videos

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis10:23

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis

Published on: April 17, 2017

Two Methods of Heterokaryon Formation to Discover HCV Restriction Factors16:49

Two Methods of Heterokaryon Formation to Discover HCV Restriction Factors

Published on: July 16, 2012

Related Concept Videos

Hepatitis01:25

Hepatitis

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...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Inhibitors Of Virion Release01:25

Inhibitors 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...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...