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Number of analytes has two identical binding sites (e.g. An antibody). This allows the analyte to bind first with one site to the ligand.

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The other (free) site is now in closer contact with other ligand molecules and can bind to a second ligand site. The formation of the second binding will depend on the flexibility of the analyte, the type of ligand, the dextran layer and the availability of free ligand. In addition, the second binding will give a stabilization of the ligand-analyte complex without extra response but shifts the equilibrium constant to a more stable interaction. A bivalent analyte gives rise to two sets of rate constants, one for each binding step. The meaning of the two sets of rate constants and particular the second set of rate constants is difficult to interpret.

The second association constant is dependent on the first binding (it is to some extent directed). In case of an antibody, both binding sites are equal, and consequently also the rate constants. However, since the second binding is dependent on the first interaction (it is to some extent directed) the second association rate constant is given in M -1s -1.

In addition, the first and second k d are interchangeable. Depending on the values, the fit will be changed and the Rmax adjusted. Visual inspection of the sensorgram and matching the k d and Rmax with the curves seems the best option. To avoid this model, immobilize the bivalent analyte or use low ligand densities on for instance a plane sensor chip with no dextran layer. In case of a bivalent interaction, the dependency of the concentration on the components of the interaction can be studied. At low analyte concentra¬tions, the LLA complex is dominating while at high analyte concentrations the LA complex is more abundant. In general, the bivalent model works better for lower affinities when multivalency effects are easier to resolve.

In order to resolve the kd of extremely stable interactions long dissociation times (hours, overnight) are needed. When comparing antibodies, it is better to capture the antibody under investigation with an anti Fc immobilized antibody.

In this way, the bivalent nature of the antibody will not appear in the sensorgram. Calculate ka2 References Baumann, S., P. Stuart, et al. Indirect immobilization of recombinant proteins to a solid phase using the albumin binding domain of streptococcal protein G and immobilized albumin. Journal of Immunological Methods 221: 95-106; (1998).

Taillon, et al. BIA/MS of epitope-tagged peptides directly from E. Coli lysate: multiplex detection and protein identification at low-femtomole to subfemtomole levels. Analytical Chemistry 71: 2858-2865; (1999). Williams Kinetic analysis of antibody-antigen interactions at a supported lipid monolayer.