Journal article

Trimeric gp120-specific bovine monoclonal antibodies require cysteine and aromatic residues in CDRH3 for high affinity binding to HIV Env

Behnaz Heydarchi, Rob J Center, Jonathan Bebbington, Jack Cuthbertson, Christopher Gonelli, Georges Khoury, Charlene Mackenzie, Marit Lichtfuss, Grant Rawlin, Brian Muller, Damian Purcell

MABS | TAYLOR & FRANCIS INC | Published : 2017

Abstract

We isolated HIV-1 Envelope (Env)-specific memory B cells from a cow that had developed high titer polyclonal immunoglobulin G (IgG) with broad neutralizing activity after a long duration vaccination with HIV-1AD8 Env gp140 trimers. We cloned the bovine IgG matched heavy (H) and light (L) chain variable (V) genes from these memory B cells and constructed IgG monoclonal antibodies (mAbs) with either a human constant (C)-region/bovine V-region chimeric or fully bovine C and V regions. Among 42 selected Ig+ memory B cells, two mAbs (6A and 8C) showed high affinity binding to gp140 Env. Characterization of both the fully bovine and human chimeric isoforms of these two mAbs revealed them as highly..

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