Biotin labeled anti kappa ab

Example 19

For CTLA-4, a commercially available recombinant CTLA-4 (R&D systems) at 100 ng/100 μL/well was immobilized on an ELISA plate (Nunc) at room temperature for 1 hour. After washing, the plate was blocked with Block Ace at room temperature for 1 hour. The periplasm fractions of wild-type CTLA4-3-1/its modified antibody were diluted to 100 μL/well with Block Ace and reacted at 37° C. for 1 hour. Detection was performed with a combination of biotin-labeled anti-Kappa Ab (Southern Biotechnology) and peroxidase (HRP)-labeled streptavidin (Vector Lab.). Absorbance at 650 nm/450 nm was measured with Microplate Reader Vmax (Molecular Devices).

Example 10

The expressed and purified recombinant SEB at 200 ng/100 μL/well was immobilized on an ELISA plate (Nunc) at 4° C. overnight and, after washing, blocked with 1% BSA-PBS at 4° C. overnight. The periplasm fractions or the culture supernatant fractions of wild-type SEB3-2-7/its modified antibody were diluted to 100 μL/well with 1% BSA-PBS and reacted at 37° C. for 1 hour. Detection was performed with a combination of biotin-labeled anti-Kappa Ab (Southern Biotechnology) and peroxidase (HRP)-labeled streptavidin (Vector Lab.). Absorbance at 650 nm/450 nm was measured with Microplate Reader Vmax (Molecular Devices).

Example 19

For CTLA-4, a commercially available recombinant CTLA-4 (R&D systems) at 100 ng/100 μL/well was immobilized on an ELISA plate (Nunc) at room temperature for 1 hour. After washing, the plate was blocked with Block Ace at room temperature for 1 hour. The periplasm fractions of wild-type CTLA4-3-1/its modified antibody were diluted to 100 μL/well with Block Ace and reacted at 37° C. for 1 hour. Detection was performed with a combination of biotin-labeled anti-Kappa Ab (Southern Biotechnology) and peroxidase (HRP)-labeled streptavidin (Vector Lab.). Absorbance at 650 nm/450 nm was measured with Microplate Reader Vmax (Molecular Devices).