A soluble recombinant fusion protein of the transmembrane envelope protein of equine infectious anaemia virus for ELISA.

The research has successfully produced an inexpensive and abundant soluble fusion protein of gp45 from equine infectious anaemia virus using the bacterial expression vector, pGex. The protein was found to be suitable for use in Enzyme-Linked Immunosorbent Assays (ELISA).

Using pGex to Produce Fusion Protein

• This study focuses on the production of a soluble fusion protein of gp45, which is derived from equine infectious anaemia virus. Here, the researchers utilized a bacterial expression vector known as pGex to execute this production.
• The pGex vector is often used in such studies due to its ability to produce abundant amounts of fusion proteins that are soluble, meaning they can be easily dissolved for analysis and use in further procedures.

Purification Process

• The research also describes the purification process of the recombinant protein. This was done through a single step affinity chromatography on immobilized glutathione.
• This purification step involved using competitive elution, allowing for the procedure to be conducted under mild conditions.
• The final yield from this process was substantial, with approximately 3.5 mg of purified soluble protein derived from every litre of bacterial culture.

Antigen Suitability for ELISA

• The resulting antigen, a substance that induces an immune response in the body, is claimed to be readily available and cost-effective, thus making it a promising candidate for use in Enzyme-Linked Immunosorbent Assays (ELISA).
• ELISA is a common laboratory technique used to detect and measure antibodies in a sample, and can be key in diagnosing a number of different diseases or conditions.
• The research verifies that the background reactivity, or unintentional immune response, associated with the glutathione-S-transferase (GST) fusion partner or the EIA-GST fusion protein itself is negligible when tested with normal or immune sera. This suggests that the produced antigen would function effectively in an ELISA test without causing a notable amount of adverse interaction.