Streptavidin-Aequorin Fusion Protein for Bioluminescent Immunoassay

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The fusion protein of streptavidin to aequorin (STA-AQ) was highly purified from inclusion bodies in Escherichia coli cells and applied to a bioluminescent sandwich immunoassay. α-Fetoprotein (AFP), which is a serological marker of liver cancer, was used as a model analyte to test STA-AQ in an immunoassay. The measurable range of AFP by the sandwich immunoassay, using the complex of STA-AQ and the biotinylated anti-AFP antibody, was 0.02–200 ng/mL with an average coefficient of variation of 4.9%. The detection sensitivity with the complex of STA-AQ and the biotinylated anti-AFP antibody was similar to that with the complex of biotinylated aequorin, streptavidin and the biotinylated anti-AFP antibody. STA-AQ would be a useful reporter protein for immunoassays.

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