What is it about?
Established convention suggests that if different antibodies attach to the same site on a target, they will produce the same functional outcome. This study makes it clear that this assumption isn't always correct. By looking at the antibodies responsible for triggering allergic reactions, the research team found four very similar antibodies that lock onto the same site on an allergy antibody. Surprisingly, they do not behave the same way. Instead, they act like molecular switches that force the allergy antibody into completely different shapes. One shape actually helps the allergy response, while the other shapes block it. This shows that we must look at how antibodies change the physical shape of their targets, rather than just where they attach, to design better targeted therapies.
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Why is it important?
This work is important because it gives new insights into how we approach the engineering and design of therapeutic antibodies. Currently, antibody discovery pipelines focus heavily on finding molecules that target novel sites. This study shows that prioritising how an antibody reshapes its target can be just as critical. Furthermore, it reveals that a tiny difference, even a single amino acid change in the antibody, can completely flip its effect from blocking a biological response to boosting it. Understanding these shape-shifting mechanics provides a new framework for engineering much more precise, next-generation therapies.
Perspectives
Our team has spent many years studying the specific molecules that drive allergic reactions. Over time, it has become increasingly clear that the primary antibody responsible for these reactions, IgE, possesses a striking capacity for large, dynamic conformational changes. Discovering that this molecule can change shape so dramatically has transformed how we view its behaviour in the immune system. This study represents the next logical step in that journey, demonstrating that we can exploit this natural flexibility to influence how the antibody behaves. By showing how highly similar antibodies can trap IgE in different shapes, this work opens up exciting new opportunities for designing therapies to precisely interfere with allergic immune responses.
James McDonnell
King's College London
Read the Original
This page is a summary of: Antibodies targeting a shared epitope exploit IgE allostery to drive distinct functional outcomes, Proceedings of the National Academy of Sciences, September 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2613091123.
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