Correlation of CD4-binding site antibody binding and local structural dynamics. (A) Peptides detected in H/D exchange, which cover the critical interface residues on the gp120 monomer (PDB entry 4NCO) upon binding of CD4bs antibodies, are colored. (B–D) Plots of deuterium exchanges at a single time point, where the largest differences were observed for the four gp120s, of different peptides covering the binding interface of CD4bs-binding antibodies vs KD (left) or on-rate (right) with linear regression. Data for FL, ΔV3, ΔV1/V2, and Coree are shown as triangles, squares, circles, and diamonds, respectively. Error bars represent standard deviations for two independent measurements.