Abstract:11F8 is a sequence-specific monoclonal anti-ssDNA autoantibody isolated from a lupus prone mouse that forms pathogenic complexes with ssDNA, resulting in kidney damage. Prior studies show that specificity is mediated by a somatic mutation from serine at (31)V(H) to arginine. Reversion back to serine in 11F8 resulted in >30-fold decrease in affinity and altered thermodynamic and kinetic parameters for sequence-specific recognition of its cognate ssDNA ligand. Mutagenesis and structural studies suggest that (R31… Show more
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