Figure 4. Stepwise immunization of the VH1-2/LC mice elicited VRC01-class CD4bs-specific antibodies with neutralizing activity.
(A) Immunization Schema. (B) Characterization of immunogens (varied symbols) for ELISA binding to VRC01 and its germline reverted variant (VRC01gl). (C) ELISA endpoint titers of post-immune sera to three germline-binding VRC01-class probes and their respective CD4bs-knock out (Δ) mutants. Error bars indicate standard deviations. (D) Splenocytes were sorted with eOD-GT6 and ΔeOD-GT6 probes to isolate CD4bs-specific IgG+ B cells. (E) Neutralizing activity of post-immune sera to various HIV-1 Env-pseudoviruses (ID50 titers). n.d., not determined.
