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Updated: Aug 17, 2026
Production and Purification of Baculovirus for Gene Therapy Application
Published on: April 9, 2018
[Hepatitis C virus core protein production and purification in a baculovirus expression system for biological assays]
Ivonne Rubio1, Alba Lucía Cómbita, Blanca Ortiz-Reyes
1Grupo de Gastrohepatología, Universidad de Antioquia, Medellin, Colombia.
Insights
Hepatitis C virus core protein was successfully produced and purified from a eukaryotic system. This recombinant protein impacts human dendritic cell function, offering insights into viral persistence mechanisms.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Context:
- Hepatitis C virus (HCV) establishes persistent infections by altering immune cells, particularly dendritic cells.
- The HCV core protein, a structural component of the viral capsid, is implicated in these immune dysfunctions.
- Challenges in obtaining pure HCV core protein hinder research into its biological properties.
Purpose:
- To produce and purify recombinant HCV core protein in a eukaryotic expression system.
- To investigate the effects of purified HCV core protein on human dendritic cell cultures.
Summary:
- Recombinant HCV core protein (p23 isoform) was expressed using a baculovirus system and purified via isoelectric point separation and electroelution.
- Purification yielded both p23 and p21 isoforms, confirmed by silver stain and Western blot.
- The expressed core protein exhibited altered molecular weight, isoforms, and subcellular localization compared to native core protein.
Impact:
- The study provides a method for producing and purifying membrane-associated proteins in eukaryotic systems.
- Understanding HCV core protein's interaction with dendritic cells may reveal new strategies for combating persistent HCV infections.
- The developed purification techniques are adaptable for other complex eukaryotic protein expression studies.
Background:
The hepatitis C virus (HCV) commonly causes persistent infection. One of the viral mechanisms in preventing viral clearance is the ability of HCV to induce functional alterations of the immune system cells, specifically of dendritic cells. Viral proteins producing the dendritic cell functional alterations have been identified as the HCV core protein, which makes up the capsid structural unit.
Objective:
One of the limitations to evaluate core protein properties is the difficulty in obtaining and purifying the complete protein--consisting of 191 amino acids. The aim of the current study was to produce and purify the recombinant core protein in a eukaryotic system, and to evaluate its effect in human dendritic cell cultures.
Results:
The core protein p23 isoform was expressed in a baculovirus system and purified using isoelectric point separation and electroelution. The purity of the core protein was confirmed by silver stain and Western blot. These analyses showed the presence of two bands that correspond to p23 and p21 isoforms of core protein as previously reported.
Conclusion:
The expressed protein differed from naive core protein is terms of molecular weight, isoforms and subcellular localization. The procedures developed for core protein are applicable for expression of other membrane-associated proteins produced in eukaryotic systems.
