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• W2982362649 abstract "Broadly neutralizing antibodies (bNAbs) to human immunodeficiency virus type 1 (HIV-1) hold great promise for immunoprophylaxis and the suppression of viremia in HIV-positive individuals. Several studies have demonstrated that plants as Nicotiana benthamiana are suitable hosts for the generation of protective anti-HIV-1 antibodies. However, the production of the anti-HIV-1 bNAbs 2F5 and PG9 in N. benthamiana is associated with their processing by apoplastic proteases in the complementarity-determining-region (CDR) H3 loops of the heavy chains. Here, it is shown that apoplastic proteases can also cleave the CDR H3 loop of the bNAb 2G12 when the unusual domain exchange between its heavy chains is prevented by the replacement of Ile19 with Arg. It is demonstrated that CDR H3 proteolysis leads to a strong reduction of the antigen-binding potencies of 2F5, PG9, and 2G12-I19R. Inhibitor profiling experiments indicate that different subtilisin-like serine proteases account for bNAb fragmentation in the apoplast. Differential scanning calorimetry experiments corroborate that the antigen-binding domains of wild-type 2G12 and 4E10 are more compact than those of proteolysis-sensitive antibodies, thus shielding their CDR H3 regions from proteolytic attack. This suggests that the extent of proteolytic inactivation of bNAbs in plants is primarily dictated by the steric accessibility of their CDR H3 loops." @default.
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• W2982362649 date "2019-11-08" @default.
• W2982362649 modified "2023-09-25" @default.
• W2982362649 title "Steric Accessibility of the Cleavage Sites Dictates the Proteolytic Vulnerability of the Anti‐HIV‐1 Antibodies 2F5, 2G12, and PG9 in Plants" @default.
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• W2982362649 doi "https://doi.org/10.1002/biot.201900308" @default.
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