National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
AI115469
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
5F30AI120510-03
米国
引用
ジャーナル: Nat Commun / 年: 2021 タイトル: Directed evolution of and structural insights into antibody-mediated disruption of a stable receptor-ligand complex. 著者: Luke F Pennington / Pascal Gasser / Silke Kleinboelting / Chensong Zhang / Georgios Skiniotis / Alexander Eggel / Theodore S Jardetzky / 要旨: Antibody drugs exert therapeutic effects via a range of mechanisms, including competitive inhibition, allosteric modulation, and immune effector mechanisms. Facilitated dissociation is an additional ...Antibody drugs exert therapeutic effects via a range of mechanisms, including competitive inhibition, allosteric modulation, and immune effector mechanisms. Facilitated dissociation is an additional mechanism where antibody-mediated "disruption" of stable high-affinity macromolecular complexes can potentially enhance therapeutic efficacy. However, this mechanism is not well understood or utilized therapeutically. Here, we investigate and engineer the weak disruptive activity of an existing therapeutic antibody, omalizumab, which targets IgE antibodies to block the allergic response. We develop a yeast display approach to select for and engineer antibody disruptive efficiency and generate potent omalizumab variants that dissociate receptor-bound IgE. We determine a low resolution cryo-EM structure of a transient disruption intermediate containing the IgE-Fc, its partially dissociated receptor and an antibody inhibitor. Our results provide a conceptual framework for engineering disruptive inhibitors for other targets, insights into the failure in clinical trials of the previous high affinity omalizumab HAE variant and anti-IgE antibodies that safely and rapidly disarm allergic effector cells.
Initial local fitting done in Chimera, followed by auto dock, and a single round of real space refinement. Carbohydrates were automatically built in phenix when possible, and a handful of flagged outliers in geometry were fixed manually in Phenix.
精密化
プロトコル: FLEXIBLE FIT
得られたモデル
PDB-7sht: Structure of a partially disrupted IgE high affinity receptor complex bound to an omalizumab variant