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Molecular & Cellular Proteomics 6:125-132, 2007.
© 2007 by The American Society for Biochemistry and Molecular Biology, Inc.

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Technology

Determination of Binding Specificities in Highly Multiplexed Bead-based Assays for Antibody Proteomics ^*,S

Jochen M. Schwenk, Johan Lindberg, Mårten Sundberg, Mathias Uhlén and Peter Nilsson^,¶

From the Departments of Proteomics and Gene Technology, Royal Institute of Technology (KTH), SE-10691 Stockholm, Sweden

One of the major challenges of antibody-based proteomics is the quality assurance of the generated antibodies to ensure specificity to the target protein. Here we describe a single tube multiplex approach to simultaneously analyze the binding of antibodies to a large number of different antigens. This bead-based assay utilizes the full multiplexing capacity theoretically offered by the Luminex suspension array technology. A protocol for an increased coupling throughput for the immobilization of antigens was developed and used to set up complex and stabile 100-plex bead mixtures. The possibility of using a two-dimensional multiplexing, in terms of high numbers of both analytes and samples or as in this case antigens and antibodies, enables the specificity of 96 antibodies versus 100 different antigens to be determined in 2 h. This high throughput analysis will potentially have great impact on the possibility for the utilization of different antibody proteomics approaches where the quality assessment of antibodies is of the utmost importance.

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