Fig. 3: Binding kinetics of antibodies and APN to S proteins using biolayer interferometry (BLI).

A Binding kinetics of S mAbs 42H3, 46E6, 67B12 and 22C10 to S RBD monomer (upper panel), prefusion PDCoV S trimer (middle panel), or to 60 °C-treated prefusion S trimer (lower panel). Antigens were immobilized onto the anti-strep mAb-coated Protein A BLI biosensors, followed by the association of each indicated mAb. B APN binding kinetics to non- (left panel) or 60 °C-treated (right panel) prefusion S trimer. Similar set-up was used as described under (A). Experiments were performed two times, one representative experiment is shown. Source data are provided as a Source Data file.