Recombinant human antibodies specific for hepatitis C virus proteins

Area of Science:

• Immunology
• Molecular Biology
• Virology

Background:

• Hepatitis C virus (HCV) infection is a major global health concern.
• Development of effective diagnostic and therapeutic tools for HCV is crucial.
• Understanding the structure and function of antibodies against HCV is essential.

Purpose of the Study:

• To clone and express human antibodies targeting hepatitis C virus (HCV) core, NS4A, and NS3 proteins.
• To characterize these antibodies as soluble Fab fragments and phage-displayed Fabs.
• To evaluate their utility in immunohistochemistry and analyze their V-gene usage and structural properties.

Main Methods:

• Cloning of human antibodies against HCV core, NS4A, and NS3 into a prokaryotic vector.
• Expression of recombinant soluble Fab fragments and phage-displayed Fabs.
• Immunohistochemistry to assess antigen recognition in mammalian cells.
• Nucleotide sequencing of cDNA for antibody variable domains.
• V-gene usage analysis and structural modeling of V domains.

Main Results:

• Successfully cloned and expressed human antibodies as soluble and phage-displayed Fab fragments.
• Demonstrated the suitability of recombinant Fabs for immunohistochemistry, recognizing cognate antigens in mammalian cells.
• Determined nucleotide sequences of variable domains and derived V-gene usage.
• Constructed structural models of the V domains based on deduced amino acid sequences.

Conclusions:

• Recombinant human Fabs against HCV core, NS4A, and NS3 are valuable tools for immunohistochemistry.
• The study provides detailed molecular and structural information on these anti-HCV antibodies.
• Findings contribute to the understanding of antibody-antigen interactions in HCV and potential diagnostic applications.