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Protein Protocols Protein Protocols

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Coupling of Abs with Biotin 357<br />

Fig. 2. (A) ELISA-type assay comparing the binding capacity of BSA and GAM biotinylated<br />

with biotin-X or biotin-XX. The assay was developed using streptavidin-HRP conjugate<br />

(0.2 µg/mL) and o-phenylenediamine dihydro-chloride (OPD). The number of biotin/mol was:<br />

4.0 biotin-X/GAM (), 4.4 biotin-XX/GAM (), 6.7 biotin-X/BSA (), and 6.2 biotin-XX/<br />

BSA (). Error bars on some data points have been omitted for clarity. (B) Similar assay using<br />

GAM biotinylated with biotin-X () or biotin-XX (). The assay was developed with streptavidin–R-phycoerythin<br />

conjugate (25 µg/mL using a Millipore CytoFluor fluorescence<br />

microtiter plate reader).<br />

microscopy. Biotin iodoacetamide or maleimide, which could biotinylate the reduced<br />

sulfhydryls located at the hinge region of antibodies, is not usually used for this purpose.<br />

More examples in the literature describe biotinylation of antibodies with biotin<br />

hydrazide at the carbohydrate prosthetic group, located in the Fc portion of the molecule,<br />

relatively removed from the binding site. Conjugation of carbohydrates with<br />

hydrazides requires the oxidation of two adjacent hydroxyls to aldehydes and optional<br />

stabilization of the reaction with cyanoborohydride (19).

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