Figure 4. PGT121 can utilize glycans in the V1/V2 loops to neutralize isolates when the glycan site at N332 or N334 is removed by alanine mutagenesis.
(A) Neutralization potency of PGT121 was measured on 92BR020, 92RW020 and CAP45 glycan mutant viruses for which N-linked glycosylation sites have been removed singly (solid line) or in combination with N332 (dashed line) by alanine mutagenesis. PGV04 was included as a control. (B) Neutralization potency of PGT121-123 was measured on virus isolate 92BR020 N332A mutant virus (red) made in HEK 293T cells (solid line) and a GnT1−/− deficient HEK 293S cell line (dotted line) and the potency compared to WT virus (black).