Fig 1. Ab08 neutralizes SARS-CoV-2 Omicron-included variants and binds to RBD with pico-molar affinities.

(A-B) Neutralization assay of Ab08 using pseudoviruses harboring the S proteins from SARS-CoV-2 Wuhan-Hu-1 and Omicron BA.1 (A) or D614G and Omicron subvariants as indicated (B). Data are plotted as mean ± SEM (SEM: standard error of mean; n = 3 biological replicates). Numbers in brackets indicate IC₅₀ values in μg/mL. (C) Neutralization activity of Ab08 against authentic SARS-CoV-2. A Plaque Reduction Neutralization Test (PRNT) was applied. Data are plotted as mean ± SEM (n = 3, biological replicates). (D) Binding affinities of Ab08 to SARS-CoV-2 prototype and variant RBDs using bilayer interferometry (BLI). Biotinylated RBDs were immobilized on a Streptavidin sensor and Ab08 (scFv) was used as analytes at indicated concentrations (nM). Solid lines represent experimental data and dashed lines represent fitted curve.