HCV Core 22kDa, Biotin

Hepatitis C Virus Core 22kDa, Biotin Recombinant
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Description

Functional Applications in Research

The HCV Core 22kDa, Biotin is utilized in diverse experimental frameworks:

ApplicationMethodKey Findings
ELISASerological assaysDetects anti-HCV antibodies in chronic hepatitis C patients .
Western BlottingProtein detectionIdentifies 22 kDa bands in HCV-infected cells (e.g., chimp liver cells) .
ImmunofluorescenceLocalization studiesVisualizes core protein in HCV-infected cells using biotin-streptavidin systems .
Viral Assembly StudiesCo-IP, membrane fractionationDemonstrates core interactions with host factors (e.g., AP2M1, DDX3) .

Biological Roles and Host Interactions

The HCV core protein exhibits multifaceted interactions with host machinery:

  • Immune Modulation:

    • Suppression of Immune Responses: Inhibits monocyte differentiation into dendritic cells (DCs) and macrophages via TLR2/STAT pathways . Reduces CD8+ T-cell proliferation and IFN-γ production .

    • Cytokine Regulation: Induces anti-inflammatory cytokines (e.g., IL-10) while suppressing pro-inflammatory mediators (e.g., IL-12, NO) .

  • Viral Assembly and Replication:

    • RNA Chaperoning: Facilitates HCV RNA folding and dimerization through basic domains .

    • Membrane Association: Palmitoylation at Cys172 and D2 domain α-helices mediate lipid droplet binding and virion formation .

    • Host Factor Exploitation: Binds AP2M1 via YXXΦ motifs to hijack clathrin-coated vesicle trafficking for viral egress .

Research Findings and Clinical Implications

Recent studies highlight the core protein’s dual role in pathogenesis and therapeutic targeting:

  • Immune Evasion:

    • gC1qR Binding: The core protein interacts with gC1qR on CD4+ T cells, inducing anti-proliferative effects and immune suppression .

    • Apoptosis Regulation: Exhibits both pro- and anti-apoptotic activities depending on cellular context (e.g., inhibiting p53/Bax pathways in hepatocytes) .

  • Therapeutic Resistance:

    • Lipid Metabolism Dysregulation: Promotes hepatocyte steatosis and fibrosis via lipid synthesis upregulation, contributing to disease progression .

Product Specs

Introduction
Hepatitis C virus (HCV) is a small (50nm), enveloped virus with a single-stranded, positive-sense RNA genome. It belongs to the family Flaviviridae. HCV replicates at a high rate, producing approximately one trillion particles daily in an infected individual. The virus exhibits a high mutation rate due to the lack of proofreading mechanisms in its RNA polymerase, which contributes to its ability to evade the host's immune response. HCV is classified into six genotypes (1-6), with multiple subtypes within each genotype. The distribution and prevalence of these genotypes vary globally. Genotype determination is crucial for clinical management as it influences the response to interferon-based therapy and the duration of treatment. Genotypes 1 and 4 are known to be less responsive to interferon-based treatment compared to genotypes 2, 3, 5, and 6.
Description
This recombinant HCV core protein is derived from E. coli and encompasses the immunodominant regions of the HCV nucleocapsid, spanning amino acids 2-192, with a molecular weight of 22 kDa. The protein is biotinylated and fused to b-galactosidase (114 kDa) at its N-terminus.
Purity
The purity of the protein is greater than 95% as determined by 10% SDS-PAGE analysis with Coomassie blue staining.
Formulation
The protein is supplied in a buffer containing 20mM Tris-HCl at pH 8 and 8M urea.
Stability
HCV-Core protein remains stable at 4°C for up to 1 week. However, for long-term storage, it is recommended to store the protein below -18°C. Avoid repeated freeze-thaw cycles.
Purification Method
HCV-Core protein was purified by proprietary chromatographic technique.
Specificity
Immunoreactive with sera of HCV-infected individuals.

Product Science Overview

Introduction

The Hepatitis C Virus Core 22kDa, Biotin Recombinant is a recombinant protein derived from the core antigen of the Hepatitis C virus. This protein is often used in research and diagnostic applications due to its ability to elicit an immune response and its role in the viral life cycle.

Hepatitis C Virus Overview

Hepatitis C virus is a bloodborne virus that primarily affects the liver, leading to conditions such as chronic hepatitis, cirrhosis, and hepatocellular carcinoma. The virus is a member of the Flaviviridae family and has a single-stranded RNA genome. The core protein, also known as the nucleocapsid protein, is one of the first viral proteins produced during infection and plays a crucial role in the assembly and packaging of the viral RNA.

Core Protein Characteristics

The core protein of the Hepatitis C virus is approximately 22 kilodaltons in size. It is highly conserved among different viral genotypes, making it an ideal target for diagnostic assays. The core protein is involved in the formation of the viral nucleocapsid and interacts with the viral RNA to form the core particle. It also has regulatory functions, influencing the host’s immune response and modulating viral replication.

Recombinant Protein Production

The recombinant Hepatitis C Virus Core 22kDa protein is typically produced in Escherichia coli expression systems. The gene encoding the core protein is cloned into a plasmid vector, which is then introduced into the bacterial cells. The bacteria are cultured, and the recombinant protein is expressed and purified. The biotinylation of the protein allows for easy detection and immobilization in various assays.

Applications

The biotinylated recombinant core protein is widely used in research and diagnostic applications. Some of its key uses include:

  • Enzyme-Linked Immunosorbent Assay (ELISA): The biotinylated core protein can be used as a capture antigen in ELISA assays to detect antibodies against the Hepatitis C virus in patient samples.
  • Western Blotting: The protein can be used as a positive control or as a probe to detect specific antibodies in Western blot assays.
  • Vaccine Research: The core protein is a potential candidate for vaccine development due to its immunogenic properties.
  • Protein-Protein Interaction Studies: The biotinylated protein can be used in pull-down assays to study interactions with other viral or host proteins.

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