Figure 4. SPR Analysis of Targeted trans Interface Mutations.

(A) Homophilic binding of wild-type and trans interface mutant δ1 EC1–EC4 fragments of pcdh-1, −7, and −9 over their respective wild-type surfaces.
(B) Effects of trans interface mutations in pcdh1 and −7 on heterophilic binding to pcdh-9 (left) and −11 (right).
(C) Homophilic binding of wild-type and trans interface mutants of δ2-pcdh-10, −12, −17, −18, and −19 over wild-type surfaces. Three analyte concentrations (27, 9, and 3 μM) are plotted and responses are scaled independently for each surface.