Figure 1. Characterization and Structure of the Homotetravalent Allergens.
(A) Structures of the haptens DNP and dansyl used in the tetravalent allergens. (B) The affinity of each hapten was determined for its specific IgE using a fluorescence quenching technique (Supplemental Information). The Kd of DNP for IgEDNP was 22 ± 2 nM and the Kd of dansyl for IgEdansyl was 54 ± 4 nM. Data represents the means ± SD of triplicate experiments. (C) Structures of the synthetic allergens HmTA [DNP4], HmTA [dansyl4], and HmBA [DNP2].