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The Fc variant of IgG2, designated as IgG2σ, was engineered with V234A/G237A /P238S/H268A/V309L/A330S/P331S substitutions to eliminate affinity for Fcγ receptors and C1q complement protein and consequently, immune effector functions. IgG2σ was compared to other previously well-characterized Fc ‘muted’ variants, including aglycosylated IgG1, IgG2m4 (H268Q/V309L/A330S/P331S, changes to IgG4), and IgG4...
The analyses of two human IgG2 Fc structures, determined in different crystal forms, and the comparison with IgG1 Fc structures reveals molecular features that are involved in accommodating and stabilizing structural conformations. In the IgG2 Fc structures relative positions of the CH 2 domains with respect to the CH 3 domains vary significantly from those observed for IgG1 Fc structures...
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