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A Multiplex Serological Assay for the Detection of Antibody Responses to Arboviruses
Published on: November 4, 2025
Rational recombinant XMRV antigen preparation and bead coupling for multiplex serology in a suspension array
Ali Sheikholvaezin1, Fredrik Blomberg, Christina Ohrmalm
1Section of Clinical Microbiology, Department of Medical Sciences, Uppsala University, Sweden.
Protein Expression and Purification
|August 30, 2011
Summary
This study presents a rapid, cost-effective method for producing recombinant viral proteins for serological testing using suspension arrays. The technique enables the creation of multi-antigen assays for infectious disease diagnosis, overcoming protein instability issues.
Area of Science:
- Biotechnology
- Immunology
- Virology
Background:
- Serological tests are crucial for diagnosing infectious diseases by detecting antibodies.
- Recombinant proteins are vital for creating comprehensive antigen panels in serology.
- Suspension arrays allow high-throughput, simultaneous measurement of multiple antibodies.
Purpose of the Study:
- To develop a generic, efficient process for preparing and purifying recombinant viral proteins for serological assays.
- To create a multiepitope assay for xenotropic murine leukemia virus-related virus (XMRV) antibodies.
- To address challenges of protein instability and aggregation in recombinant antigen production.
Main Methods:
- Expression of viral proteins fused to thioredoxin A (TrxA) in Escherichia coli Origami B.
- Purification using inclusion body formation, urea solubilization, and His tag affinity chromatography.
- Direct covalent coupling of purified proteins to Luminex microspheres for suspension array analysis.
- Preabsorption of sera to mitigate false positives from carrier or bacterial proteins.
Main Results:
- Successful preparation and purification of six XMRV Gag and Env proteins as fusion proteins.
- Demonstrated utility in creating a multiepitope XMRV antibody assay.
- Achieved high yields (2-10mg/100ml culture) sufficient for extensive serological testing.
- Reduced false positives through preabsorption techniques.
Conclusions:
- The described strategy provides a simple, quick, efficient, and inexpensive method for producing recombinant antigens for suspension array serology.
- This generic approach is applicable to a wide range of viral, bacterial, fungal, and parasitic antigens.
- The method circumvents common protein instability and aggregation issues, yielding functional antigens for antibody detection.
