Affinity and Kinetic Analysis of Fcγ Receptor IIIa (CD16a) Binding to IgG Ligands*

Binding of pathogen-bound immunoglobulin G (IgG) to cell surface Fc γ receptors (FcγRs) triggers a wide variety of effector functions. The binding kinetics and affinities of IgG-FcγR interactions are hence important parameters for understanding FcγR-mediated immune functions. We have measured the kinetic rates and equilibrium dissociation constants of IgG binding to a soluble FcγRIIIa fused with Ig Fc (sCD16a) using the surface plasmon resonance technique. sCD16a interacted with monomeric human IgG and its subtypes IgG1 and IgG3 as well as rabbit IgG with on-rates of 6.5 × 103, 8.2 × 103, 1.1 × 104 and 1.8 × 104 m–1 s–1, off-rates of 4.7 × 10–3, 5.7 × 10–3, 5.9 × 10–3, and 1.9 × 10–2 s–1, and equilibrium dissociation constants of 0.72, 0.71, 0.56, and 1.1 μm, respectively. The kinetics and affinities measured by surface plasmon resonance agreed with those obtained from real time flow cytometry and competition inhibition binding experiments using cell surface CD16a. These data add to our understanding of IgG-FcγR interactions.

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